Frost dates for Okmulgee Wtr Wks, OK
At Okmulgee Wtr Wks, the median last spring frost (32°F) is Apr 8 and the median first fall frost is Oct 28, for a typical growing season of 203 days. For a 90% chance that the last frost has passed, wait until Apr 25. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 8Last spring frost (median)50% chance of 32°F after this date
- Apr 25Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 203 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 19 | May 3 |
| 32°F | Mar 23 | Apr 8 | Apr 25 |
| 28°F | Mar 11 | Mar 29 | Apr 15 |
| 24°F | Feb 28 | Mar 15 | Apr 3 |
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 5 | Oct 20 | Nov 2 |
| 32°F | Oct 12 | Oct 28 | Nov 11 |
| 28°F | Oct 22 | Nov 6 | Nov 23 |
| 24°F | Oct 31 | Nov 17 | Dec 4 |
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 | 164 days | 184 days | 204 days |
| 32°F | 181 days | 203 days | 224 days |
| 28°F | 200 days | 224 days | 247 days |
| 24°F | 221 days | 245 days | 271 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 |
|---|---|---|---|
| 74447 | 7b | 5 to 10°F | 3 km |
| 74456 | 7b | 5 to 10°F | 10 km |
| 74460 | 7b | 5 to 10°F | 14 km |
| 74421 | 7b | 5 to 10°F | 16 km |
| 74445 | 7b | 5 to 10°F | 18 km |
| 74431 | 7b | 5 to 10°F | 20 km |
| 74437 | 7b | 5 to 10°F | 23 km |
| 74438 | 7b | 5 to 10°F | 27 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 USC00346670, at 35.6239, -96.0250, elevation 197 m (647 ft).
- Data quality: Representative (10+ years), 13 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
- Okemah (33 km)
- Bristow (40 km)
- Bixby (42 km)
- Tulsa R L Jones Jr Airport (46 km)
- Muskogee Davis Field (60 km)
- Muskogee (65 km)
- Tulsa Intl Airport (65 km)
- Holdenville 3ese Mesonet (68 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.