Frost dates for Grandfield 3W Mesonet, OK
At Grandfield 3W Mesonet, the median last spring frost (32°F) is Mar 31 and the median first fall frost is Nov 6, for a typical growing season of 219 days. For a 90% chance that the last frost has passed, wait until Apr 18. Nearby ZIP codes are in USDA hardiness zone 8a.
- Mar 31Last spring frost (median)50% chance of 32°F after this date
- Apr 18Safer planting date10% chance of 32°F after this date
- Nov 6First fall frost (median)50% chance of 32°F by this date
- 219 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 8a (10 to 15°F) · see all zone 8a frost dates
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 26 | Apr 12 | Apr 27 |
| 32°F | Mar 10 | Mar 31 | Apr 18 |
| 28°F | Feb 25 | Mar 18 | Apr 5 |
| 24°F | Feb 9 | Mar 4 | Mar 28 |
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 17 | Oct 30 | Nov 11 |
| 32°F | Oct 23 | Nov 6 | Nov 21 |
| 28°F | Oct 28 | Nov 14 | Dec 2 |
| 24°F | Nov 7 | Nov 26 | Dec 15 |
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 | 177 days | 198 days | 220 days |
| 32°F | 196 days | 219 days | 245 days |
| 28°F | 215 days | 243 days | 268 days |
| 24°F | 238 days | 267 days | 296 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 |
|---|---|---|---|
| 73546 | 8a | 10 to 15°F | 3 km |
| 73553 | 8a | 10 to 15°F | 11 km |
| 73531 | 8a | 10 to 15°F | 20 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 USC00343707, at 34.2392, -98.7444, elevation 342 m (1,122 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 72.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Chattanooga (22 km)
- Altus AFB (25 km)
- Frederick (30 km)
- Walters 4NW Mesonet (41 km)
- Tipton 4S Mesonet (42 km)
- Walters (43 km)
- Lawton Muni Airport (46 km)
- Lawton (49 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.