Frost dates for Arapahoe 14n, CO
At Arapahoe 14n, the median last spring frost (32°F) is May 9 and the median first fall frost is Oct 7, for a typical growing season of 150 days. For a 90% chance that the last frost has passed, wait until May 22. Nearby ZIP codes are in USDA hardiness zone 6a.
- 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 7First fall frost (median)50% chance of 32°F by this date
- 150 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 18 | May 31 |
| 32°F | Apr 27 | May 9 | May 22 |
| 28°F | Apr 14 | Apr 30 | May 12 |
| 24°F | Apr 3 | Apr 19 | May 2 |
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 16 | Sep 30 | Oct 11 |
| 32°F | Sep 23 | Oct 7 | Oct 19 |
| 28°F | Oct 1 | Oct 15 | Oct 27 |
| 24°F | Oct 10 | Oct 23 | Nov 7 |
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 | 113 days | 133 days | 149 days |
| 32°F | 129 days | 150 days | 167 days |
| 28°F | 147 days | 167 days | 184 days |
| 24°F | 166 days | 187 days | 208 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 80802 | 6a | -10 to -5°F | 23 km |
| 67762 | 6a | -10 to -5°F | 26 km |
| 80807 | 6a | -10 to -5°F | 32 km |
| 80810 | 6a | -10 to -5°F | 33 km |
| 67758 | 6a | -10 to -5°F | 37 km |
| 80805 | 6a | -10 to -5°F | 37 km |
| 67741 | 6a | -10 to -5°F | 41 km |
| 80836 | 6a | -10 to -5°F | 46 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 USC00050301, at 39.0372, -102.1675, elevation 1262 m (4,142 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 167.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cheyenne Wells 2ne (25 km)
- Burlington Carson Airport (25 km)
- Burlington (31 km)
- Arapahoe 12s (39 km)
- Stratton (48 km)
- Kit Carson 9nne (51 km)
- Kit Carson (63 km)
- Sheridan Lake 4e (63 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.