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Oklahoma frost dates
Across the 20Oklahoma weather stations below, the average last spring frost ranges from Mar 26 in Altus to Apr 22 in Goodwell 2 E. The statewide middle is about Apr 4 for the last spring frost and Nov 2 for the first fall frost. Altus has the longest growing season, about 229 days. Hardiness zones in these places: 6b, 7a, 7b, 8a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Altus | 8a | Mar 26 | Apr 14 | Nov 10 | 229 |
| Tulsa R L Jones Jr | 7b | Mar 30 | Apr 17 | Nov 4 | 219 |
| Mcalester | 7b | Mar 31 | Apr 18 | Nov 3 | 217 |
| Tulsa | 7b | Mar 31 | Apr 15 | Nov 4 | 218 |
| Lawton | 7b | Apr 1 | Apr 19 | Nov 5 | 218 |
| Muskogee Davis | 7b | Apr 2 | Apr 20 | Nov 2 | 214 |
| Oklahoma Post | 7b | Apr 2 | Apr 18 | Nov 4 | 216 |
| Guthrie | 7b | Apr 3 | Apr 20 | Nov 1 | 212 |
| Stillwater | 7a | Apr 3 | Apr 21 | Oct 31 | 211 |
| Hobart | 7b | Apr 4 | Apr 21 | Nov 4 | 214 |
| Oklahoma Will Rogers | 7b | Apr 4 | Apr 20 | Nov 2 | 212 |
| Clinton Sherman | 7b | Apr 5 | Apr 22 | Nov 4 | 213 |
| Stillwater 2 W | 7a | Apr 5 | Apr 21 | Oct 30 | 208 |
| Ponca | 7a | Apr 10 | Apr 27 | Oct 27 | 200 |
| Bartlesville F P | 7a | Apr 12 | Apr 28 | Oct 21 | 192 |
| Stillwater 5 Wnw | 7a | Apr 12 | Apr 27 | Oct 27 | 198 |
| Gage | 7a | Apr 17 | May 2 | Oct 20 | 186 |
| Goodwell 2 Se | – | Apr 18 | May 3 | Oct 24 | 189 |
| Guymon | 6b | Apr 18 | May 1 | Oct 23 | 188 |
| Goodwell 2 E | 6b | Apr 22 | May 5 | Oct 22 | 183 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Oklahoma
Using the statewide middle dates (last frost Apr 4, first frost Nov 2). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Oklahoma |
|---|---|
| Tomatoes | Apr 11 – Apr 25 |
| Peas | Feb 21 – Mar 14; fall: Aug 10 – Aug 31 |
| Potatoes | Mar 7 – Mar 28 |
| Green beans | Apr 11 – Apr 25; fall: Aug 17 – Aug 31 |
| Garlic | Nov 2 – Nov 30 |
| Tulips | Oct 19 – Nov 30 |