Frost dates for Steamboat Springs, CO
At Steamboat Springs, the median last spring frost (32°F) is Jun 9 and the median first fall frost is Sep 12, for a typical growing season of 93 days. For a 90% chance that the last frost has passed, wait until Jun 24. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- Jun 9Last spring frost (median)50% chance of 32°F after this date
- Jun 24Safer planting date10% chance of 32°F after this date
- Sep 12First fall frost (median)50% chance of 32°F by this date
- 93 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 5b (-15 to -10°F) · see all zone 5b frost dates
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 32°F | May 25 | Jun 9 | Jun 24 |
| 28°F | May 2 | May 20 | Jun 6 |
| 24°F | Apr 14 | May 2 | May 21 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 32°F | Aug 31 | Sep 12 | Sep 24 |
| 28°F | Sep 9 | Sep 23 | Oct 6 |
| 24°F | Sep 20 | Oct 4 | Oct 19 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 41 days | 64 days | 83 days |
| 32°F | 75 days | 93 days | 111 days |
| 28°F | 104 days | 126 days | 148 days |
| 24°F | 134 days | 155 days | 177 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 80487 | 5b | -15 to -10°F | 12 km |
| 80428 | 5a | -20 to -15°F | 40 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00057936, at 40.4883, -106.8233, elevation 2093 m (6,866 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 232.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spicer (32 km)
- Hayden (36 km)
- Yampa (38 km)
- Walden (54 km)
- Craig Moffat Co Airport (59 km)
- Kremmling (62 km)
- Craig 4SW (65 km)
- Gould 4SE Sfsp (69 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.