BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Frost Calendar//Boulder 2027//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Boulder frost & planting 2027 BEGIN:VEVENT UID:colorado-boulder-2027-1@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270506 DTEND;VALUE=DATE:20270507 SUMMARY:Boulder: typical last frost (32°F\, 50%) DESCRIPTION:Half of years have their last 32°F night by today. NOAA 1991 –2020 normals\, station Boulder (USC00050848). Long-term odds\, not a fo recast. Details: https://frostcalendar.com/colorado/boulder/planting-calen dar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-2@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270518 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: safer last-frost date (32°F\, 10%) DESCRIPTION:About 1 year in 10 still has a 32°F night after today. NOAA 19 91–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-cal endar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-3@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270921 DTEND;VALUE=DATE:20270922 SUMMARY:Boulder: early first-frost risk (32°F\, 10%) DESCRIPTION:About 1 year in 10 has its first 32°F night by today. NOAA 199 1–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a f orecast. Details: https://frostcalendar.com/colorado/boulder/planting-cale ndar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-4@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20271005 DTEND;VALUE=DATE:20271006 SUMMARY:Boulder: typical first frost (32°F\, 50%) DESCRIPTION:Half of years have had their first 32°F night by today. NOAA 1 991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-ca lendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-5@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270502 DTEND;VALUE=DATE:20270517 SUMMARY:Boulder: Start tomato seeds indoors DESCRIPTION:Start tomato seeds indoors. Timing rule: CSU Extension / UNL Ex tension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC 00050848). Long-term odds\, not a forecast. Details: https://frostcalendar .com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-6@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270620 DTEND;VALUE=DATE:20270621 SUMMARY:Boulder: Tomatoes: transplant outdoors DESCRIPTION:Window from the typical-date anchor (Jun 20) to the safer ancho r (Jun 20). Tomatoes: transplant outdoors. Timing rule: CSU Extension / UN L Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcale ndar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-7@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270330 DTEND;VALUE=DATE:20270414 SUMMARY:Boulder: Start pepper seeds indoors DESCRIPTION:Start pepper seeds indoors. Timing rule: CSU Extension / UNL Ex tension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC 00050848). Long-term odds\, not a forecast. Details: https://frostcalendar .com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-8@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270520 DTEND;VALUE=DATE:20270602 SUMMARY:Boulder: Peppers: transplant outdoors DESCRIPTION:Window from the typical-date anchor (May 20) to the safer ancho r (Jun 1). Peppers: transplant outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (U SC00050848). Long-term odds\, not a forecast. Details: https://frostcalend ar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-9@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270422 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Potatoes: plant (seed pieces) outdoors DESCRIPTION:Window from the typical-date anchor (Apr 22 – May 6) to the s afer anchor (May 4–18). Potatoes: plant (seed pieces) outdoors. Timing r ule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 nor mals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Det ails: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-10@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Onions (dry\, from sets): plant sets outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Onions (dry\, from sets): plant sets outdoors. T iming rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2 020 normals\, station Boulder (USC00050848). Long-term odds\, not a foreca st. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-11@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Peas: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Peas: direct sow outdoors. Timing rule: CSU Exte nsion / UNL Extension (see methodology). NOAA 1991–2020 normals\, statio n Boulder (USC00050848). Long-term odds\, not a forecast. Details: https:/ /frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-12@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270718 DTEND;VALUE=DATE:20270719 SUMMARY:Boulder: Last day to sow peas for a fall harvest DESCRIPTION:Last day to sow peas for a fall harvest. Timing rule: CSU Exten sion / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https:// frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-13@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Lettuce (leaf): direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Lettuce (leaf): direct sow outdoors. Timing rule : CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normal s\, station Boulder (USC00050848). Long-term odds\, not a forecast. Detail s: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-14@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270723 DTEND;VALUE=DATE:20270724 SUMMARY:Boulder: Last day to sow lettuce (leaf) for a fall harvest DESCRIPTION:Last day to sow lettuce (leaf) for a fall harvest. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals \, station Boulder (USC00050848). Long-term odds\, not a forecast. Details : https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-15@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270422 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Carrots: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 22 – May 6) to the s afer anchor (May 4–18). Carrots: direct sow outdoors. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-16@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270713 DTEND;VALUE=DATE:20270714 SUMMARY:Boulder: Last day to sow carrots for a fall harvest DESCRIPTION:Last day to sow carrots for a fall harvest. Timing rule: CSU Ex tension / UNL Extension (see methodology). NOAA 1991–2020 normals\, stat ion Boulder (USC00050848). Long-term odds\, not a forecast. Details: https ://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-17@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270506 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Beans (snap): direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 6) to the safer anchor (May 18). Beans (snap): direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Bould er (USC00050848). Long-term odds\, not a forecast. Details: https://frostc alendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-18@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270709 DTEND;VALUE=DATE:20270710 SUMMARY:Boulder: Last day to sow beans (snap) for a fall harvest DESCRIPTION:Last day to sow beans (snap) for a fall harvest. Timing rule: C SU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-19@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270506 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Summer squash: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 6) to the safer anchor (May 18). Summer squash: direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boul der (USC00050848). Long-term odds\, not a forecast. Details: https://frost calendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-20@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270719 DTEND;VALUE=DATE:20270720 SUMMARY:Boulder: Last day to sow summer squash for a fall harvest DESCRIPTION:Last day to sow summer squash for a fall harvest. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\ , station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-21@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270223 DTEND;VALUE=DATE:20270310 SUMMARY:Boulder: Start broccoli seeds indoors DESCRIPTION:Start broccoli seeds indoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (U SC00050848). Long-term odds\, not a forecast. Details: https://frostcalend ar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-22@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Broccoli: transplant outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Broccoli: transplant outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, st ation Boulder (USC00050848). Long-term odds\, not a forecast. Details: htt ps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-23@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270530 DTEND;VALUE=DATE:20270614 SUMMARY:Boulder: Start broccoli seeds indoors for a fall crop DESCRIPTION:Start broccoli seeds indoors for a fall crop. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, st ation Boulder (USC00050848). Long-term odds\, not a forecast. Details: htt ps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-24@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270718 DTEND;VALUE=DATE:20270719 SUMMARY:Boulder: Last day to set out broccoli transplants for a fall harves t DESCRIPTION:Last day to set out broccoli transplants for a fall harvest. Ti ming rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–20 20 normals\, station Boulder (USC00050848). Long-term odds\, not a forecas t. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-25@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270223 DTEND;VALUE=DATE:20270310 SUMMARY:Boulder: Start cabbage seeds indoors DESCRIPTION:Start cabbage seeds indoors. Timing rule: CSU Extension / UNL E xtension (see methodology). NOAA 1991–2020 normals\, station Boulder (US C00050848). Long-term odds\, not a forecast. Details: https://frostcalenda r.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-26@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Cabbage: transplant outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Cabbage: transplant outdoors. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-27@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270510 DTEND;VALUE=DATE:20270525 SUMMARY:Boulder: Start cabbage seeds indoors for a fall crop DESCRIPTION:Start cabbage seeds indoors for a fall crop. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-28@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270628 DTEND;VALUE=DATE:20270629 SUMMARY:Boulder: Last day to set out cabbage transplants for a fall harvest DESCRIPTION:Last day to set out cabbage transplants for a fall harvest. Tim ing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–202 0 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast . Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-29@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270309 DTEND;VALUE=DATE:20270324 SUMMARY:Boulder: Start cauliflower seeds indoors DESCRIPTION:Start cauliflower seeds indoors. Timing rule: CSU Extension / U NL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcal endar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-30@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270422 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Cauliflower: transplant outdoors DESCRIPTION:Window from the typical-date anchor (Apr 22 – May 6) to the s afer anchor (May 4–18). Cauliflower: transplant outdoors. Timing rule: C SU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-31@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Kohlrabi: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Kohlrabi: direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, st ation Boulder (USC00050848). Long-term odds\, not a forecast. Details: htt ps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-32@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270802 DTEND;VALUE=DATE:20270803 SUMMARY:Boulder: Last day to sow kohlrabi for a fall harvest DESCRIPTION:Last day to sow kohlrabi for a fall harvest. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-33@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Green onions: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Green onions: direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\ , station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-34@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270723 DTEND;VALUE=DATE:20270724 SUMMARY:Boulder: Last day to sow green onions for a fall harvest DESCRIPTION:Last day to sow green onions for a fall harvest. Timing rule: C SU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-35@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Radishes: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Radishes: direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, st ation Boulder (USC00050848). Long-term odds\, not a forecast. Details: htt ps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-36@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270822 DTEND;VALUE=DATE:20270823 SUMMARY:Boulder: Last day to sow radishes for a fall harvest DESCRIPTION:Last day to sow radishes for a fall harvest. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-37@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Spinach: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Spinach: direct sow outdoors. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-38@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270812 DTEND;VALUE=DATE:20270813 SUMMARY:Boulder: Last day to sow spinach for a fall harvest DESCRIPTION:Last day to sow spinach for a fall harvest. Timing rule: CSU Ex tension / UNL Extension (see methodology). NOAA 1991–2020 normals\, stat ion Boulder (USC00050848). Long-term odds\, not a forecast. Details: https ://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-39@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270408 DTEND;VALUE=DATE:20270505 SUMMARY:Boulder: Turnips: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 8–22) to the safer a nchor (Apr 20 – May 4). Turnips: direct sow outdoors. Timing rule: CSU E xtension / UNL Extension (see methodology). NOAA 1991–2020 normals\, sta tion Boulder (USC00050848). Long-term odds\, not a forecast. Details: http s://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-40@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270802 DTEND;VALUE=DATE:20270803 SUMMARY:Boulder: Last day to sow turnips for a fall harvest DESCRIPTION:Last day to sow turnips for a fall harvest. Timing rule: CSU Ex tension / UNL Extension (see methodology). NOAA 1991–2020 normals\, stat ion Boulder (USC00050848). Long-term odds\, not a forecast. Details: https ://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-41@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270422 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Beets: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 22 – May 6) to the s afer anchor (May 4–18). Beets: direct sow outdoors. Timing rule: CSU Ext ension / UNL Extension (see methodology). NOAA 1991–2020 normals\, stati on Boulder (USC00050848). Long-term odds\, not a forecast. Details: https: //frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-42@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270723 DTEND;VALUE=DATE:20270724 SUMMARY:Boulder: Last day to sow beets for a fall harvest DESCRIPTION:Last day to sow beets for a fall harvest. Timing rule: CSU Exte nsion / UNL Extension (see methodology). NOAA 1991–2020 normals\, statio n Boulder (USC00050848). Long-term odds\, not a forecast. Details: https:/ /frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-43@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270422 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Swiss chard: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 22 – May 6) to the s afer anchor (May 4–18). Swiss chard: direct sow outdoors. Timing rule: C SU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-44@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270723 DTEND;VALUE=DATE:20270724 SUMMARY:Boulder: Last day to sow swiss chard for a fall harvest DESCRIPTION:Last day to sow swiss chard for a fall harvest. Timing rule: CS U Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: h ttps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-45@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270422 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Parsnips: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (Apr 22 – May 6) to the s afer anchor (May 4–18). Parsnips: direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, st ation Boulder (USC00050848). Long-term odds\, not a forecast. Details: htt ps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-46@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270506 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Sweet corn: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 6) to the safer anchor (May 18). Sweet corn: direct sow outdoors. Timing rule: CSU Extension / U NL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcal endar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-47@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270506 DTEND;VALUE=DATE:20270519 SUMMARY:Boulder: Cucumbers: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 6) to the safer anchor (May 18). Cucumbers: direct sow outdoors. Timing rule: CSU Extension / UN L Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcale ndar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-48@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270714 DTEND;VALUE=DATE:20270715 SUMMARY:Boulder: Last day to sow cucumbers for a fall harvest DESCRIPTION:Last day to sow cucumbers for a fall harvest. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, st ation Boulder (USC00050848). Long-term odds\, not a forecast. Details: htt ps://frostcalendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-49@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270323 DTEND;VALUE=DATE:20270414 SUMMARY:Boulder: Start eggplant seeds indoors DESCRIPTION:Start eggplant seeds indoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (U SC00050848). Long-term odds\, not a forecast. Details: https://frostcalend ar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-50@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270520 DTEND;VALUE=DATE:20270602 SUMMARY:Boulder: Eggplant: transplant outdoors DESCRIPTION:Window from the typical-date anchor (May 20) to the safer ancho r (Jun 1). Eggplant: transplant outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder ( USC00050848). Long-term odds\, not a forecast. Details: https://frostcalen dar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-51@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270520 DTEND;VALUE=DATE:20270602 SUMMARY:Boulder: Cantaloupe: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 20) to the safer ancho r (Jun 1). Cantaloupe: direct sow outdoors. Timing rule: CSU Extension / U NL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcal endar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-52@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270520 DTEND;VALUE=DATE:20270602 SUMMARY:Boulder: Watermelon: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 20) to the safer ancho r (Jun 1). Watermelon: direct sow outdoors. Timing rule: CSU Extension / U NL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC00050848). Long-term odds\, not a forecast. Details: https://frostcal endar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-53@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20270520 DTEND;VALUE=DATE:20270602 SUMMARY:Boulder: Winter squash: direct sow outdoors DESCRIPTION:Window from the typical-date anchor (May 20) to the safer ancho r (Jun 1). Winter squash: direct sow outdoors. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boul der (USC00050848). Long-term odds\, not a forecast. Details: https://frost calendar.com/colorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT BEGIN:VEVENT UID:colorado-boulder-2027-54@frostcalendar.com DTSTAMP:20261008T171512Z DTSTART;VALUE=DATE:20271001 DTEND;VALUE=DATE:20271015 SUMMARY:Boulder: Plant garlic cloves DESCRIPTION:Plant garlic cloves. Timing rule: CSU Extension / UNL Extension (see methodology). NOAA 1991–2020 normals\, station Boulder (USC0005084 8). Long-term odds\, not a forecast. Details: https://frostcalendar.com/co lorado/boulder/planting-calendar/ TRANSP:TRANSPARENT URL:https://frostcalendar.com/colorado/boulder/planting-calendar/ END:VEVENT END:VCALENDAR