Frost dates for Divide 4nw, CO
At Divide 4nw, the median last spring frost (32°F) is Jun 1 and the median first fall frost is Sep 21, for a typical growing season of 110 days. For a 90% chance that the last frost has passed, wait until Jun 17. Nearby ZIP codes are in USDA hardiness zone 5b.
- Jun 1Last spring frost (median)50% chance of 32°F after this date
- Jun 17Safer planting date10% chance of 32°F after this date
- Sep 21First fall frost (median)50% chance of 32°F by this date
- 110 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 | Jun 2 | Jun 15 | Jul 2 |
| 32°F | May 22 | Jun 1 | Jun 17 |
| 28°F | May 10 | May 21 | Jun 2 |
| 24°F | Apr 30 | May 11 | May 24 |
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 | Aug 27 | Sep 10 | Sep 23 |
| 32°F | Sep 7 | Sep 21 | Oct 2 |
| 28°F | Sep 17 | Sep 30 | Oct 14 |
| 24°F | Sep 27 | Oct 9 | Oct 23 |
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 | 65 days | 85 days | 104 days |
| 32°F | 91 days | 110 days | 125 days |
| 28°F | 112 days | 130 days | 146 days |
| 24°F | 132 days | 151 days | 168 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 |
|---|---|---|---|
| 80814 | 5b | -15 to -10°F | 3 km |
| 80863 | 5b | -15 to -10°F | 16 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 USC00052294, at 38.9608, -105.2158, elevation 2784 m (9,134 ft).
- Data quality: Estimated from nearby stations (2+ years), 5 years of freeze data.
- Average days per year at or below 32°F: 216.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Florissant Fossil Bed (8 km)
- Cripple Creek 3nnw (18 km)
- Lake George 8 SW (23 km)
- Ruxton Park (25 km)
- Cheesman (29 km)
- Monument 3s (32 km)
- Monument (34 km)
- Guffey 9se (34 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.