Oklahoma frost dates by city
| City | Last frost (50%) | Safer date (10%) | First frost (50%) | Season |
|---|---|---|---|---|
| Oklahoma City | Apr 4 | Apr 20 | Nov 2 | 213 days |
| Tulsa | Mar 31 | Apr 15 | Nov 4 | 220 days |
Each city uses its nearest major NOAA weather station, usually the airport. Valleys, hilltops and rural spots can differ from it by one to three weeks. How to read these dates.