Frost dates for Stillwater Regional Airport, OK
At Stillwater Regional Airport, the median last spring frost (32°F) is Apr 3 and the median first fall frost is Oct 31, for a typical growing season of 209 days. For a 90% chance that the last frost has passed, wait until Apr 21. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 3Last 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
- 209 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 16 | May 1 |
| 32°F | Mar 18 | Apr 3 | Apr 21 |
| 28°F | Mar 4 | Mar 23 | Apr 8 |
| 24°F | Feb 23 | Mar 11 | Mar 30 |
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 6 | Oct 22 | Nov 3 |
| 32°F | Oct 15 | Oct 31 | Nov 14 |
| 28°F | Oct 24 | Nov 8 | Nov 25 |
| 24°F | Nov 1 | Nov 20 | Dec 6 |
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 | 166 days | 189 days | 209 days |
| 32°F | 187 days | 209 days | 231 days |
| 28°F | 205 days | 230 days | 254 days |
| 24°F | 228 days | 251 days | 279 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 |
|---|---|---|---|
| 74075 | 7a | 0 to 5°F | 1 km |
| 74032 | 7a | 0 to 5°F | 18 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 USW00003965, at 36.1625, -97.0894, elevation 300 m (984 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 87.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Stillwater 5 WNW (4 km)
- Stillwater Mesonet (5 km)
- Stillwater 2 W (5 km)
- Stillwater 2 W (5 km)
- Coyle 7n Mesonet (16 km)
- Orlando 5e Mesonet (18 km)
- Perkins 2nnw Mesonet (19 km)
- Red Rock 7sse Mesonet (22 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.