Frost dates for Sulphur 4nne Mesonet, OK
At Sulphur 4nne Mesonet, the median last spring frost (32°F) is Apr 4 and the median first fall frost is Nov 1, for a typical growing season of 212 days. For a 90% chance that the last frost has passed, wait until Apr 24. Nearby ZIP codes are in USDA hardiness zones 7b to 8a.
- Apr 4Last spring frost (median)50% chance of 32°F after this date
- Apr 24Safer planting date10% chance of 32°F after this date
- Nov 1First fall frost (median)50% chance of 32°F by this date
- 212 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 30 | Apr 15 | Apr 30 |
| 32°F | Mar 15 | Apr 4 | Apr 24 |
| 28°F | Feb 28 | Mar 20 | Apr 10 |
| 24°F | Feb 14 | Mar 6 | Mar 31 |
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 9 | Oct 25 | Nov 8 |
| 32°F | Oct 17 | Nov 1 | Nov 17 |
| 28°F | Oct 24 | Nov 10 | Nov 30 |
| 24°F | Nov 3 | Nov 23 | Dec 12 |
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 | 169 days | 192 days | 214 days |
| 32°F | 188 days | 212 days | 238 days |
| 28°F | 209 days | 236 days | 262 days |
| 24°F | 232 days | 260 days | 288 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 |
|---|---|---|---|
| 73086 | 7b | 5 to 10°F | 9 km |
| 74865 | 7b | 5 to 10°F | 13 km |
| 73032 | 8a | 10 to 15°F | 21 km |
| 73098 | 7b | 5 to 10°F | 21 km |
| 74856 | 7b | 5 to 10°F | 22 km |
| 74843 | 7b | 5 to 10°F | 23 km |
| 74872 | 7b | 5 to 10°F | 23 km |
| 73030 | 7b | 5 to 10°F | 24 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 USC00348570, at 34.5658, -96.9503, elevation 320 m (1,049 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 75.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Chickasaw Nra (8 km)
- Fittstown 6sw Mesonet (21 km)
- Pauls Valley 1ssw Mesonet (30 km)
- Byars 3ese Mesonet (32 km)
- Ada (35 km)
- Pauls Valley 4 WSW (35 km)
- Tishomingo 6n Mesonet (36 km)
- Ada 2nne Mesonet (36 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.