Frost dates for Sheridan Lake 4E, CO
At Sheridan Lake 4E, the median last spring frost (32°F) is Apr 28 and the median first fall frost is Oct 13, for a typical growing season of 167 days. For a 90% chance that the last frost has passed, wait until May 12. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 28Last spring frost (median)50% chance of 32°F after this date
- May 12Safer planting date10% chance of 32°F after this date
- Oct 13First fall frost (median)50% chance of 32°F by this date
- 167 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 | Apr 26 | May 8 | May 23 |
| 32°F | Apr 13 | Apr 28 | May 12 |
| 28°F | Apr 4 | Apr 18 | Apr 30 |
| 24°F | Mar 25 | Apr 8 | Apr 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 |
|---|---|---|---|
| 36°F | Sep 23 | Oct 5 | Oct 16 |
| 32°F | Oct 1 | Oct 13 | Oct 24 |
| 28°F | Oct 9 | Oct 21 | Nov 1 |
| 24°F | Oct 15 | Oct 29 | Nov 10 |
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 | 130 days | 150 days | 166 days |
| 32°F | 149 days | 167 days | 184 days |
| 28°F | 166 days | 184 days | 203 days |
| 24°F | 184 days | 203 days | 224 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 |
|---|---|---|---|
| 81071 | 6a | -10 to -5°F | 5 km |
| 67879 | 6a | -10 to -5°F | 37 km |
| 81043 | 6a | -10 to -5°F | 39 km |
| 80802 | 6a | -10 to -5°F | 40 km |
| 80810 | 6a | -10 to -5°F | 43 km |
| 67762 | 6a | -10 to -5°F | 46 km |
| 81036 | 6a | -10 to -5°F | 51 km |
| 81047 | 6a | -10 to -5°F | 51 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 USC00057586, at 38.4683, -102.2169, elevation 1231 m (4,039 ft).
- Data quality: Estimated from nearby stations (2+ years), 6 years of freeze data.
- Average days per year at or below 32°F: 155.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sheridan Lake (7 km)
- Arapahoe 12S (24 km)
- Cheyenne Wells 2NE (44 km)
- Holly (47 km)
- Eads (49 km)
- Lamar (55 km)
- Kit Carson (60 km)
- Lamar Muni Airport (60 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.