When to plant in Evans, CO
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Evans, Colorado — is derived from the closest NOAA station with complete climate normals.
Zone 5b means Evans sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
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 Evans’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 Evans, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 34 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.
Evans planting FAQ
When is the last spring frost in Evans, CO?
Plan for the last spring frost in Evans 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 Evans, CO?
Expect Evans's first fall frost near October 8 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Evans in?
Evans 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 Evans?
There are roughly 159 frost-free days in Evans (a moderate growing season), running from the average last frost around May 2 to the first fall frost near October 8.
When should I plant tomatoes in Evans?
In Evans, start tomato seeds indoors around March 7–March 21, then transplant seedlings outdoors around May 9 once the danger of frost has passed.
Never miss a window in Evans
An email when it’s time to start seeds, transplant, and sow — timed to Evans’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at GREELEY UNC, 7 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 Evans, CO — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00053553. Retrieved from https://blissgarden.com/colorado/evans.