Frost dates for New Raymer 21 N, CO
At New Raymer 21 N, the median last spring frost (32°F) is May 18 and the median first fall frost is Sep 29, for a typical growing season of 133 days. For a 90% chance that the last frost has passed, wait until Jun 2. Nearby ZIP codes are in USDA hardiness zones 5a to 5b.
- May 18Last spring frost (median)50% chance of 32°F after this date
- Jun 2Safer planting date10% chance of 32°F after this date
- Sep 29First fall frost (median)50% chance of 32°F by this date
- 133 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 15 | May 28 | Jun 13 |
| 32°F | May 5 | May 18 | Jun 2 |
| 28°F | Apr 22 | May 6 | May 22 |
| 24°F | Apr 9 | Apr 26 | May 12 |
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 6 | Sep 21 | Oct 2 |
| 32°F | Sep 15 | Sep 29 | Oct 11 |
| 28°F | Sep 25 | Oct 8 | Oct 19 |
| 24°F | Oct 3 | Oct 17 | Oct 29 |
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 | 93 days | 114 days | 131 days |
| 32°F | 112 days | 133 days | 152 days |
| 28°F | 133 days | 153 days | 171 days |
| 24°F | 151 days | 172 days | 192 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 |
|---|---|---|---|
| 80742 | 5a | -20 to -15°F | 20 km |
| 80729 | 5a | -20 to -15°F | 31 km |
| 69128 | 5a | -20 to -15°F | 33 km |
| 80754 | 5b | -15 to -10°F | 35 km |
| 80732 | 5a | -20 to -15°F | 37 km |
| 80745 | 5b | -15 to -10°F | 38 km |
| 69145 | 5a | -20 to -15°F | 39 km |
| 82082 | 5a | -20 to -15°F | 41 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 USC00055934, at 40.9319, -103.8678, elevation 1579 m (5,180 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 192.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- New Raymer (36 km)
- Briggsdale (51 km)
- Sterling (65 km)
- Fort Morgan (75 km)
- Nunn 7 NNE (76 km)
- Leroy 5 WSW (87 km)
- Crook (90 km)
- Fleming 3sw (91 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.