Frost dates for Rush 1n, CO
At Rush 1n, the median last spring frost (32°F) is May 9 and the median first fall frost is Oct 4, for a typical growing season of 146 days. For a 90% chance that the last frost has passed, wait until May 22. Nearby ZIP codes are in USDA hardiness zone 5b.
- May 9Last spring frost (median)50% chance of 32°F after this date
- May 22Safer planting date10% chance of 32°F after this date
- Oct 4First fall frost (median)50% chance of 32°F by this date
- 146 daysGrowing season (median)between 32°F freezes
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 |
|---|---|---|---|
| 36°F | May 7 | May 19 | Jun 1 |
| 32°F | Apr 29 | May 9 | May 22 |
| 28°F | Apr 18 | Apr 30 | May 11 |
| 24°F | Apr 5 | Apr 20 | May 3 |
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 |
|---|---|---|---|
| 36°F | Sep 14 | Sep 25 | Oct 7 |
| 32°F | Sep 21 | Oct 4 | Oct 16 |
| 28°F | Sep 30 | Oct 12 | Oct 25 |
| 24°F | Oct 8 | Oct 21 | Nov 4 |
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 | 109 days | 127 days | 145 days |
| 32°F | 127 days | 146 days | 163 days |
| 28°F | 148 days | 164 days | 182 days |
| 24°F | 164 days | 183 days | 202 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 |
|---|---|---|---|
| 80833 | 5b | -15 to -10°F | 16 km |
| 80808 | 5b | -15 to -10°F | 24 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 USC00057287, at 38.8611, -104.0939, elevation 1845 m (6,054 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 181.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ellicott 7s (30 km)
- Matheson 8 SE (37 km)
- Limon WSMO (49 km)
- Karval (50 km)
- Ordway 21 N (50 km)
- Eastonville 2 NNW (52 km)
- Colorado Springs Muni Airport (52 km)
- Cumbre Vista - Colorado Springs 1 (54 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.