Frost dates for Washington 6ssw Mesonet, OK
At Washington 6ssw Mesonet, the median last spring frost (32°F) is Mar 31 and the median first fall frost is Nov 3, for a typical growing season of 217 days. For a 90% chance that the last frost has passed, wait until Apr 17. Nearby ZIP codes are in USDA hardiness zone 7b.
- Mar 31Last spring frost (median)50% chance of 32°F after this date
- Apr 17Safer planting date10% chance of 32°F after this date
- Nov 3First fall frost (median)50% chance of 32°F by this date
- 217 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 26 | Apr 12 | Apr 27 |
| 32°F | Mar 12 | Mar 31 | Apr 17 |
| 28°F | Feb 27 | Mar 15 | Apr 4 |
| 24°F | Feb 12 | Mar 3 | Mar 20 |
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 13 | Oct 26 | Nov 9 |
| 32°F | Oct 20 | Nov 3 | Nov 18 |
| 28°F | Oct 28 | Nov 13 | Nov 30 |
| 24°F | Nov 5 | Nov 24 | Dec 13 |
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 | 174 days | 194 days | 217 days |
| 32°F | 194 days | 217 days | 243 days |
| 28°F | 215 days | 242 days | 267 days |
| 24°F | 239 days | 267 days | 292 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 |
|---|---|---|---|
| 73080 | 7b | 5 to 10°F | 8 km |
| 73031 | 7b | 5 to 10°F | 12 km |
| 73093 | 7b | 5 to 10°F | 14 km |
| 73052 | 7b | 5 to 10°F | 18 km |
| 73057 | 7b | 5 to 10°F | 19 km |
| 73010 | 7b | 5 to 10°F | 19 km |
| 73002 | 7b | 5 to 10°F | 20 km |
| 73095 | 7b | 5 to 10°F | 23 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 USC00349346, at 34.9819, -97.5208, elevation 345 m (1,131 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 73.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Purcell 2 SW (12 km)
- Blanchard 2 SSW (20 km)
- Lindsay 2 W (20 km)
- Norman 3sse (23 km)
- Norman 2nw Mesonet (29 km)
- Pauls Valley 4 WSW (36 km)
- Chickasha 2sse Mesonet (36 km)
- Chickasha Exp. Station (37 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.