When to plant in Greeley, CO
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Greeley, Colorado — all computed from Greeley's nearest NOAA weather station.
In zone 5b, Greeley gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
GREELEY UNC · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Greeley’s own odds, recorded at GREELEY UNC.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 26 | May 12 | May 1 | Sep 18 | Sep 30 | Oct 11 |
| 32°F | May 14 | May 2 | Apr 17 | Sep 26 | Oct 8 | Oct 21 |
| 28°F | May 5 | Apr 20 | Apr 5 | Oct 4 | Oct 18 | Nov 1 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Greeley, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 28 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Greeley planting FAQ
When is the last spring frost in Greeley, CO?
Plan for the last spring frost in Greeley around May 2 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Greeley, CO?
The first fall frost in Greeley typically arrives around October 8 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Greeley in?
Greeley is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Greeley?
Greeley has about 159 frost-free days — a moderate growing season — between the average last spring frost (May 2) and first fall frost (October 8).
When should I plant tomatoes in Greeley?
For Greeley, sow tomatoes indoors about March 7–March 21 and move the seedlings out around May 9, after the last spring frost.
Never miss a window in Greeley
An email when it’s time to start seeds, transplant, and sow — timed to Greeley’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at GREELEY UNC, 6 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Greeley, CO — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00053553. Retrieved from https://blissgarden.com/colorado/greeley.