Frost dates for Stillwater Mesonet, OK
At Stillwater Mesonet, the median last spring frost (32°F) is Apr 6 and the median first fall frost is Oct 31, for a typical growing season of 208 days. For a 90% chance that the last frost has passed, wait until Apr 21. Nearby ZIP codes are in USDA hardiness zones 7a to 7b.
- Apr 6Last spring frost (median)50% chance of 32°F after this date
- Apr 21Safer planting date10% chance of 32°F after this date
- Oct 31First fall frost (median)50% chance of 32°F by this date
- 208 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 | Mar 31 | Apr 17 | May 2 |
| 32°F | Mar 20 | Apr 6 | Apr 21 |
| 28°F | Mar 7 | Mar 26 | Apr 10 |
| 24°F | Feb 23 | Mar 12 | Mar 29 |
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 | Oct 7 | Oct 22 | Nov 4 |
| 32°F | Oct 15 | Oct 31 | Nov 14 |
| 28°F | Oct 23 | Nov 8 | Nov 24 |
| 24°F | Nov 1 | Nov 17 | Dec 5 |
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 | 167 days | 187 days | 209 days |
| 32°F | 187 days | 208 days | 231 days |
| 28°F | 205 days | 229 days | 256 days |
| 24°F | 226 days | 253 days | 277 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 |
|---|---|---|---|
| 74078 | 7a | 0 to 5°F | 1 km |
| 74077 | 7a | 0 to 5°F | 2 km |
| 74074 | 7a | 0 to 5°F | 5 km |
| 74075 | 7a | 0 to 5°F | 5 km |
| 74059 | 7b | 5 to 10°F | 17 km |
| 74062 | 7a | 0 to 5°F | 20 km |
| 74032 | 7a | 0 to 5°F | 20 km |
| 73027 | 7b | 5 to 10°F | 22 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 USC00348499, at 36.1208, -97.0953, elevation 272 m (892 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 89.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Stillwater 2 W (0 km)
- Stillwater 2 W (0 km)
- Stillwater 5 WNW (2 km)
- Stillwater Regional Airport (5 km)
- Coyle 7n Mesonet (12 km)
- Perkins 2nnw Mesonet (14 km)
- Orlando 5e Mesonet (17 km)
- Perry (26 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.