When to plant in Severance, CO
USDA Zone 5bSeverance, Colorado frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Heads up: the nearest complete-normals station is about 16 km from Severance, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. Zone 5b means Severance sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
FT COLLINS 4 E · 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 Severance’s own odds, recorded at FT COLLINS 4 E.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 26 | May 14 | May 3 | Sep 13 | Sep 27 | Oct 8 |
| 32°F | May 15 | May 3 | Apr 21 | Sep 22 | Oct 6 | Oct 17 |
| 28°F | May 8 | Apr 23 | Apr 8 | Sep 30 | Oct 14 | Oct 26 |
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 Severance, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Severance planting FAQ
When is the last spring frost in Severance, CO?
Plan for the last spring frost in Severance around May 3 (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 Severance, CO?
Expect Severance's first fall frost near October 6 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Severance in?
Severance 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 Severance?
There are roughly 156 frost-free days in Severance (a moderate growing season), running from the average last frost around May 3 to the first fall frost near October 6.
When should I plant tomatoes in Severance?
In Severance, start tomato seeds indoors around March 8–March 22, then transplant seedlings outdoors around May 10 once the danger of frost has passed.
Never miss a window in Severance
An email when it’s time to start seeds, transplant, and sow — timed to Severance’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Windsor · 5 km
- Greeley · 13 km
- Fort Collins · 18 km
- Loveland · 20 km
- Evans · 20 km
- Johnstown · 22 km
- Wellington · 24 km
- Berthoud · 26 km
Frost dates recorded at FT COLLINS 4 E, 16 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 Severance, CO — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00053006. Retrieved from https://blissgarden.com/colorado/severance.