When to plant in Fort Morgan, CO
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Fort Morgan, Colorado — is derived from the closest NOAA station with complete climate normals.
In zone 5b, Fort Morgan gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
FT MORGAN · 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 Fort Morgan’s own odds, recorded at FT MORGAN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 15 | May 4 | Sep 17 | Sep 28 | Oct 8 |
| 32°F | May 19 | May 6 | Apr 23 | Sep 24 | Oct 6 | Oct 18 |
| 28°F | May 9 | Apr 27 | Apr 11 | Oct 2 | Oct 15 | 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 Fort Morgan, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 40 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.
Fort Morgan planting FAQ
When is the last spring frost in Fort Morgan, CO?
Fort Morgan's average last spring frost falls near May 6 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Fort Morgan, CO?
In Fort Morgan, the first 32°F freeze of fall lands around October 6 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Fort Morgan in?
Fort Morgan 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 Fort Morgan?
Fort Morgan has about 153 frost-free days — a moderate growing season — between the average last spring frost (May 6) and first fall frost (October 6).
When should I plant tomatoes in Fort Morgan?
For Fort Morgan, sow tomatoes indoors about March 11–March 25 and move the seedlings out around May 13, after the last spring frost.
Never miss a window in Fort Morgan
An email when it’s time to start seeds, transplant, and sow — timed to Fort Morgan’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at FT MORGAN, 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 Fort Morgan, CO — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00053038. Retrieved from https://blissgarden.com/colorado/fort-morgan.