Oklahoma Frost Dates and Planting Zones
Across 765 ZIP codes we matched to a NOAA weather station, Oklahoma’s last spring frost (50% risk, 32°F) ranges from Apr 26 near Boise City 2 e to Mar 14 near Sherman. First fall frost runs from Oct 17 near Freedom to Nov 19 near Sherman. Look up your exact ZIP code on the frost date tool for a station-matched result and hardiness zone.
Frost dates by city in Oklahoma
The 12 weather stations covering the most OK ZIP codes, at the 50% and 10% probability levels (32°F threshold). The 10% date is later and safer to plant after; the 50% date is the typical planning date.
| Station | Last frost (50%) | Last frost (10%) | First frost (50%) | First frost (10%) |
|---|---|---|---|---|
| Oklahoma City Will Rogers ap | Apr 4 | Apr 20 | Nov 2 | Oct 21 |
| Tulsa Intl ap | Mar 31 | Apr 15 | Nov 4 | Oct 20 |
| Oklahoma City Post ap | Apr 2 | Apr 18 | Nov 4 | Oct 21 |
| Spencer 2ene Mesonet | Apr 2 | Apr 18 | Nov 5 | Oct 20 |
| Mannford 6 nw | Apr 6 | Apr 23 | Oct 29 | Oct 14 |
| Mcalester Rgnl ap | Mar 31 | Apr 18 | Nov 3 | Oct 20 |
| Muskogee Davis Fld | Apr 2 | Apr 20 | Nov 2 | Oct 20 |
| Tulsa r l Jones jr ap | Mar 30 | Apr 17 | Nov 4 | Oct 21 |
| Okmulgee Wtr Wks | Apr 8 | Apr 25 | Oct 28 | Oct 12 |
| Chattanooga | Apr 7 | Apr 24 | Nov 2 | Oct 17 |
| Miami | Apr 6 | Apr 26 | Oct 27 | Oct 14 |
| Wister 3s | Apr 6 | Apr 24 | Nov 2 | Oct 18 |
USDA hardiness zones in Oklahoma
Share of Oklahoma ZIP codes in each 2023 USDA Plant Hardiness Zone. 67.6% of OK ZIP codes moved to a different zone between the 2012 and 2023 maps, mostly warming as winter lows trended up.
| Zone (2023) | Share of OK ZIPs |
|---|---|
| 6b | 2% |
| 7a | 23.7% |
| 7b | 60.4% |
| 8a | 13.9% |
Climate is shifting
Averaged across OK stations with both normals periods, the last spring frost now lands about 1 day earlier than the 1981–2010 normal. First fall frost now lands about 1 day later, stretching or shrinking the frost-free season depending on the station.
Plan around your Oklahoma frost dates
Once you know your local last and first frost, these guides help you time the work around them: