Greeley, CO Vegetable Planting Calendar

What to plant now in Greeley

In October:

• Plant garlic cloves (Oct 1–14)

The list above is for the month this page was built; the box is refreshed in your browser for today's date.

Spring planting dates

“Plant out” means transplanting for crops started indoors and sowing or planting directly in the garden for the others. Each column applies CSU Extension's timing rule to a different last-frost anchor: aggressive = typical date (May 2, 50% risk), balanced = May 7 (30%), safe = May 14 (10%). For hardy crops the cell shows the CSU “as early as” window.

Before sowing, check the soil too. CSU recommends taking its temperature at 4 inches (6 inches for beans). Since NOAA publishes no soil-temperature normals, we give CSU's minimum soil temperature for each crop rather than a date.

Fall planting dates

Latest dates for a fall harvest, using the University of Nebraska–Lincoln Extension count-back formula: days to harvest (CSU) + 14-day fall factor + 14-day frost-tender factor for frost-sensitive crops, counted back from the first-frost date. For transplanted crops (CSU days are from transplant) the result is the latest transplant date; seeds go in CSU's transplant-age weeks earlier. We add no harvest period, so these dates give you a first harvest by the first frost, not a long harvest.

Month-by-month: what to plant in Greeley

What to plant in Greeley in February

• Start broccoli seeds indoors (Feb 19 – Mar 5)
• Start cabbage seeds indoors (Feb 19 – Mar 5)

What to plant in Greeley in March

• Start cauliflower seeds indoors (Mar 5–19)
• Start eggplant seeds indoors (Mar 19 – Apr 9)
• Start pepper seeds indoors (Mar 26 – Apr 9)
• Start broccoli seeds indoors (Feb 19 – Mar 5)
• Start cabbage seeds indoors (Feb 19 – Mar 5)

What to plant in Greeley in April

• Onions (dry, from sets): plant sets outdoors (Apr 4–30)
• Peas: direct sow outdoors (Apr 4–30)
• Lettuce (leaf): direct sow outdoors (Apr 4–30)
• Broccoli: transplant outdoors (Apr 4–30)
• Cabbage: transplant outdoors (Apr 4–30)
• Kohlrabi: direct sow outdoors (Apr 4–30)
• Green onions: direct sow outdoors (Apr 4–30)
• Radishes: direct sow outdoors (Apr 4–30)
• Spinach: direct sow outdoors (Apr 4–30)
• Turnips: direct sow outdoors (Apr 4–30)
• Potatoes: plant (seed pieces) outdoors (Apr 18 – May 14)
• Carrots: direct sow outdoors (Apr 18 – May 14)
• Cauliflower: transplant outdoors (Apr 18 – May 14)
• Beets: direct sow outdoors (Apr 18 – May 14)
• Swiss chard: direct sow outdoors (Apr 18 – May 14)
• Parsnips: direct sow outdoors (Apr 18 – May 14)
• Start tomato seeds indoors (Apr 22 – May 6)
• Start eggplant seeds indoors (Mar 19 – Apr 9)
• Start pepper seeds indoors (Mar 26 – Apr 9)

What to plant in Greeley in May

• Beans (snap): direct sow outdoors (May 2–14)
• Summer squash: direct sow outdoors (May 2–14)
• Sweet corn: direct sow outdoors (May 2–14)
• Cucumbers: direct sow outdoors (May 2–14)
• Start cabbage seeds indoors for a fall crop (May 13–27)
• Peppers: transplant outdoors (May 16–28)
• Eggplant: transplant outdoors (May 16–28)
• Cantaloupe: direct sow outdoors (May 16–28)
• Watermelon: direct sow outdoors (May 16–28)
• Winter squash: direct sow outdoors (May 16–28)
• Potatoes: plant (seed pieces) outdoors (Apr 18 – May 14)
• Carrots: direct sow outdoors (Apr 18 – May 14)
• Cauliflower: transplant outdoors (Apr 18 – May 14)
• Beets: direct sow outdoors (Apr 18 – May 14)
• Swiss chard: direct sow outdoors (Apr 18 – May 14)
• Parsnips: direct sow outdoors (Apr 18 – May 14)
• Start tomato seeds indoors (Apr 22 – May 6)

What to plant in Greeley in June

• Start broccoli seeds indoors for a fall crop (Jun 2–16)
• Tomatoes: transplant outdoors (Jun 10)

What to plant in Greeley in July

• Last day to set out cabbage transplants for a fall harvest (by Jul 1)
• Last day to sow beans (snap) for a fall harvest (by Jul 12)
• Last day to sow carrots for a fall harvest (by Jul 16)
• Last day to sow cucumbers for a fall harvest (by Jul 17)
• Last day to sow peas for a fall harvest (by Jul 21)
• Last day to set out broccoli transplants for a fall harvest (by Jul 21)
• Last day to sow summer squash for a fall harvest (by Jul 22)
• Last day to sow lettuce (leaf) for a fall harvest (by Jul 26)
• Last day to sow green onions for a fall harvest (by Jul 26)
• Last day to sow beets for a fall harvest (by Jul 26)
• Last day to sow swiss chard for a fall harvest (by Jul 26)

What to plant in Greeley in August

• Last day to sow kohlrabi for a fall harvest (by Aug 5)
• Last day to sow turnips for a fall harvest (by Aug 5)
• Last day to sow spinach for a fall harvest (by Aug 15)
• Last day to sow radishes for a fall harvest (by Aug 25)

What to plant in Greeley in October

• Plant garlic cloves (Oct 1–14)

Crop-by-crop notes

When to plant tomatoes in Greeley

Very tender crop. Set tomatoes out about Jun 10, whichever risk level you go by. That date comes from CSU Extension's night rule (nights above 52°F): the average nightly low at Greeley UNC first rises above 52°F on Jun 10. CSU's other rule, at least 2 weeks after the average last frost, would allow about May 16 in Greeley. Sow seeds indoors Apr 22 – May 6, 5–7 weeks before transplanting on Jun 10. CSU notes that nights under 55°F hurt fruit set. The normal low at Greeley UNC climbs to 55°F on Jun 21. CSU's typical time from transplant to harvest for tomato plants is 65 days. Set out on Jun 10, they would start producing around Aug 14, 55 days before the typical first frost (Oct 8).

When to plant peppers in Greeley

Very tender crop. CSU Extension's rule is 2+ weeks after the average last frost, which puts peppers outside around May 16 (typical date), May 21 (balanced) or May 28 (safer 10% date). Start seeds indoors Mar 26 – Apr 9, 6–8 weeks ahead of transplanting on May 21. Fruit set suffers when nights drop below 55°F (CSU). The normal low at Greeley UNC reaches 55°F on Jun 21. CSU's typical time from transplant to harvest for pepper plants is 70 days. Set out on May 21, they would start producing around Jul 30, 70 days before the typical first frost (Oct 8).

When to plant potatoes in Greeley

Semi-hardy crop. CSU says potatoes can be planted as early as 0–2 weeks before the average last frost, in soil of at least 45°F. In Greeley, that's roughly Apr 18 – May 2 going by the typical date, or Apr 30 – May 14 going by the safer date.

When to plant onions (dry, from sets) in Greeley

Hardy crop. CSU says onions (dry, from sets) can go in as early as 2–4 weeks before the average last frost, once the soil can be worked and is at least 35°F. In Greeley, that's roughly Apr 4–18 going by the typical date, or Apr 16–30 going by the safer date.

When to plant peas in Greeley

Hardy crop. CSU says peas can go in as early as 2–4 weeks before the average last frost, once the soil can be worked and is at least 40°F. In Greeley, that's roughly Apr 4–18 going by the typical date, or Apr 16–30 going by the safer date. For fall, sow by Jul 21 (Jul 9 to be safe), which is 79 days before the first-frost date.

When to plant lettuce (leaf) in Greeley

Hardy crop. CSU says lettuce (leaf) can go in as early as 2–4 weeks before the average last frost, once the soil can be worked and is at least 35°F. In Greeley, that's roughly Apr 4–18 going by the typical date, or Apr 16–30 going by the safer date. For a fall crop, sow by Jul 26, or by Jul 14 to be safe. That's 74 days back from the first-frost date.

When to plant carrots in Greeley

Semi-hardy crop. CSU says carrots can be planted as early as 0–2 weeks before the average last frost, in soil of at least 40°F. In Greeley, that's roughly Apr 18 – May 2 going by the typical date, or Apr 30 – May 14 going by the safer date. For a fall crop, sow by Jul 16, or by Jul 4 to be safe. That's 84 days back from the first-frost date.

When to plant beans (snap) in Greeley

Tender crop. CSU's timing for beans (snap) is around the average last frost, which is about May 2 in Greeley. For only a 1-in-10 chance of a later 32°F night, hold off until May 14. Seeds want soil at 55°F or warmer. For a fall crop, sow by Jul 12, or by Jun 30 to be safe. That's 88 days back from the first-frost date.

When to plant summer squash in Greeley

Tender crop. Sow summer squash around the average last frost, per CSU: about May 2 in Greeley. Waiting until May 14 cuts the chance of a later 32°F night to 1 in 10. Seeds need soil of at least 60°F. For fall, count back 78 days from the first-frost date. That means sowing by Jul 22, or by Jul 10 to be safe.

When to plant broccoli in Greeley

Hardy crop. Per CSU, broccoli can be planted as early as 2–4 weeks before the average last frost, as long as the soil is workable and at least 40°F. For Greeley, that works out to roughly Apr 4–18 (typical date) or Apr 16–30 (safer date). Using CSU's typical 65 days from transplant to harvest, broccoli plants set out on Apr 9 would start producing around Jun 13. That's 117 days before the typical first frost (Oct 8). Fall broccoli: set transplants out by Jul 21. The date counts back from the typical first frost (Oct 8) by UNL Extension's method, using CSU's 65 days from transplant to harvest. Home-grown transplants need seeds started Jun 2–16 (CSU: 5–7 weeks).

When to plant cabbage in Greeley

Hardy crop. CSU says cabbage can go in as early as 2–4 weeks before the average last frost: roughly Apr 4–18 in Greeley using the typical date, or Apr 16–30 using the safer one. Wait until the soil can be worked and is at least 40°F. Using CSU's typical 85 days from transplant to harvest, cabbage plants set out on Apr 9 would start producing around Jul 3. That's 97 days before the typical first frost (Oct 8). For a fall crop, set cabbage transplants out by Jul 1. That's UNL Extension's count-back from the typical first frost (Oct 8), using CSU's 85 days from transplant to harvest. If you grow your own transplants, start seeds May 13–27 (CSU: 5–7 weeks to transplant size).

When to plant cauliflower in Greeley

Semi-hardy crop. CSU says cauliflower can be planted as early as 0–2 weeks before the average last frost, in soil of at least 40°F. In Greeley, that's roughly Apr 18 – May 2 going by the typical date, or Apr 30 – May 14 going by the safer date.

When to plant kohlrabi in Greeley

Hardy crop. Per CSU, kohlrabi can be planted as early as 2–4 weeks before the average last frost, as long as the soil is workable and at least 40°F. For Greeley, that works out to roughly Apr 4–18 (typical date) or Apr 16–30 (safer date). For a fall crop, sow by Aug 5, or by Jul 24 to be safe. That's 64 days back from the first-frost date.

When to plant green onions in Greeley

Hardy crop. CSU says green onions can go in as early as 2–4 weeks before the average last frost: roughly Apr 4–18 in Greeley using the typical date, or Apr 16–30 using the safer one. Wait until the soil can be worked and is at least 35°F. For fall, sow by Jul 26 (Jul 14 to be safe), which is 74 days before the first-frost date.

When to plant radishes in Greeley

Hardy crop. CSU says radishes can go in as early as 2–4 weeks before the average last frost, once the soil can be worked and is at least 40°F. In Greeley, that's roughly Apr 4–18 going by the typical date, or Apr 16–30 going by the safer date. For fall, sow by Aug 25 (Aug 13 to be safe), which is 44 days before the first-frost date.

When to plant spinach in Greeley

Hardy crop. CSU says spinach can go in as early as 2–4 weeks before the average last frost, once the soil can be worked and is at least 40°F. In Greeley, that's roughly Apr 4–18 going by the typical date, or Apr 16–30 going by the safer date. For fall, sow by Aug 15 (Aug 3 to be safe), which is 54 days before the first-frost date.

When to plant turnips in Greeley

Hardy crop. CSU says turnips can go in as early as 2–4 weeks before the average last frost: roughly Apr 4–18 in Greeley using the typical date, or Apr 16–30 using the safer one. Wait until the soil can be worked and is at least 40°F. For fall, count back 64 days from the first-frost date. That means sowing by Aug 5, or by Jul 24 to be safe.

When to plant beets in Greeley

Semi-hardy crop. CSU allows planting beets as early as 0–2 weeks before the average last frost, in soil at 40°F or warmer. For Greeley, that's roughly Apr 18 – May 2 by the typical date or Apr 30 – May 14 by the safer date. For a fall crop, sow by Jul 26, or by Jul 14 to be safe. That's 74 days back from the first-frost date.

When to plant swiss chard in Greeley

Semi-hardy crop. CSU allows planting swiss chard as early as 0–2 weeks before the average last frost, in soil at 40°F or warmer. For Greeley, that's roughly Apr 18 – May 2 by the typical date or Apr 30 – May 14 by the safer date. For fall, sow by Jul 26 (Jul 14 to be safe), which is 74 days before the first-frost date.

When to plant parsnips in Greeley

Semi-hardy crop. CSU says parsnips can be planted as early as 0–2 weeks before the average last frost, in soil of at least 35°F. In Greeley, that's roughly Apr 18 – May 2 going by the typical date, or Apr 30 – May 14 going by the safer date.

When to plant sweet corn in Greeley

Tender crop. CSU says to sow sweet corn around the average last frost, about May 2 in Greeley. If you want only a 1-in-10 chance of a later 32°F night, wait until May 14. Seeds need soil of at least 50°F.

When to plant cucumbers in Greeley

Tender crop. CSU's timing for cucumbers is around the average last frost, which is about May 2 in Greeley. For only a 1-in-10 chance of a later 32°F night, hold off until May 14. Seeds want soil at 60°F or warmer. For fall, sow by Jul 17 (Jul 5 to be safe), which is 83 days before the first-frost date.

When to plant eggplant in Greeley

Very tender crop. CSU Extension's rule is 2+ weeks after the average last frost, which puts eggplant outside around May 16 (typical date), May 21 (balanced) or May 28 (safer 10% date). Start seeds indoors Mar 19 – Apr 9, 6–9 weeks ahead of transplanting on May 21. Set out on May 21, eggplant plants would start producing around Jul 20, based on CSU's typical 60 days from transplant to harvest. That leaves 80 days before the typical first frost (Oct 8).

When to plant cantaloupe in Greeley

Very tender crop. CSU Extension says to plant cantaloupe 2+ weeks after the average last frost: about May 16 (typical date), May 21 (balanced) or May 28 (safer 10% date). Wait for soil of at least 60°F.

When to plant watermelon in Greeley

Very tender crop. Following CSU Extension's rule of 2+ weeks after the average last frost, plant watermelon around May 16 at the earliest, May 21 as a balanced choice, or May 28 to be safe. CSU's minimum soil temperature is 60°F.

When to plant winter squash in Greeley

Very tender crop. CSU Extension's rule is to plant winter squash at least 2 weeks after the average last frost. That's about May 16 using the typical date, May 21 as a balanced choice, or May 28 if you go by the safer 10% date. Seeds need soil of at least 60°F.

When to plant garlic in Greeley

CSU Extension's Colorado guidance is to plant garlic in early October, before October 15 (Oct 1–14). That's a fixed statewide window, not one computed from frost data. At Greeley UNC, the typical first hard freeze (28°F) is Oct 18, 4 days after the window ends.

How these dates are calculated

CSU states its spring rules relative to “the average last spring frost.” We use the 50% date as that average and also show the 30% and 10% anchors. See the methodology for details and limitations.

FAQ

When should I start seeds indoors in Greeley?

Start tomatoes Apr 22 – May 6 and peppers Mar 26 – Apr 9. Both dates count back from a balanced (30%-risk) transplant date using CSU's transplant ages.

When should I plant tomatoes outside in Greeley?

About Jun 10 at every risk level, because the night rule decides it. CSU wants nights above 52°F at transplant, and the average nightly low at Greeley UNC first rises above 52°F on Jun 10. CSU's frost rule (2+ weeks after the average last frost) would allow about May 16 here.

What can I plant in Greeley in the fall?

Based on UNL Extension's count-back from the typical first frost (Oct 8), sow peas by Jul 21; lettuce (leaf) by Jul 26; carrots by Jul 16; beans (snap) by Jul 12; summer squash by Jul 22; broccoli by Jul 21 (transplants); cabbage by Jul 1 (transplants); kohlrabi by Aug 5; green onions by Jul 26; radishes by Aug 25; spinach by Aug 15; turnips by Aug 5; beets by Jul 26; swiss chard by Jul 26; cucumbers by Jul 17. Garlic goes in Oct 1–14.

When should I plant garlic in Greeley?

Early October, before October 15 (Oct 1–14). That's CSU Extension's guidance for Colorado.

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