Frost dates for Ardmore, OK
At Ardmore, the median last spring frost (32°F) is Mar 15 and the median first fall frost is Nov 14, for a typical growing season of 244 days. For a 90% chance that the last frost has passed, wait until Apr 2. Nearby ZIP codes are in USDA hardiness zone 8a.
- Mar 15Last spring frost (median)50% chance of 32°F after this date
- Apr 2Safer planting date10% chance of 32°F after this date
- Nov 14First fall frost (median)50% chance of 32°F by this date
- 244 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 6 | Mar 27 | Apr 14 |
| 32°F | Feb 24 | Mar 15 | Apr 2 |
| 28°F | Feb 10 | Mar 3 | Mar 22 |
| 24°F | Jan 25 | Feb 20 | Mar 10 |
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 21 | Nov 5 | Nov 20 |
| 32°F | Oct 29 | Nov 14 | Dec 2 |
| 28°F | Nov 6 | Nov 26 | Dec 13 |
| 24°F | Nov 19 | Dec 9 | Jan 3 |
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 | 196 days | 221 days | 246 days |
| 32°F | 218 days | 244 days | 269 days |
| 28°F | 241 days | 268 days | 296 days |
| 24°F | 262 days | 293 days | 324 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 73401 | 8a | 10 to 15°F | 6 km |
| 73443 | 8a | 10 to 15°F | 13 km |
| 73436 | 8a | 10 to 15°F | 16 km |
| 73453 | 8a | 10 to 15°F | 19 km |
| 73458 | 8a | 10 to 15°F | 24 km |
| 73463 | 8a | 10 to 15°F | 26 km |
| 73448 | 8a | 10 to 15°F | 26 km |
| 73032 | 8a | 10 to 15°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 USC00340292, at 34.1772, -97.1617, elevation 256 m (841 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 46.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ardmore 7wnw Mesonet (7 km)
- Ardmore 3ene Mesonet (7 km)
- Healdton 3 E (25 km)
- Madill 11wsw Mesonet (26 km)
- Burneyville 2se Mesont (33 km)
- Marietta 5sw (33 km)
- Madill (37 km)
- Ringling 1n Mesonet (39 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.