Frost dates for Norman 3sse, OK
At Norman 3sse, the median last spring frost (32°F) is Apr 3 and the median first fall frost is Nov 3, for a typical growing season of 212 days. For a 90% chance that the last frost has passed, wait until Apr 18. Nearby ZIP codes are in USDA hardiness zone 7b.
- Apr 3Last spring frost (median)50% chance of 32°F after this date
- Apr 18Safer planting date10% chance of 32°F after this date
- Nov 3First 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 14 | Apr 28 |
| 32°F | Mar 19 | Apr 3 | Apr 18 |
| 28°F | Mar 5 | Mar 23 | Apr 7 |
| 24°F | Feb 24 | Mar 11 | Mar 29 |
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 11 | Oct 25 | Nov 6 |
| 32°F | Oct 21 | Nov 3 | Nov 17 |
| 28°F | Oct 27 | Nov 12 | Nov 27 |
| 24°F | Nov 4 | Nov 21 | Dec 9 |
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 | 173 days | 193 days | 212 days |
| 32°F | 191 days | 212 days | 234 days |
| 28°F | 211 days | 232 days | 256 days |
| 24°F | 231 days | 254 days | 280 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 |
|---|---|---|---|
| 73019 | 7b | 5 to 10°F | 3 km |
| 73093 | 7b | 5 to 10°F | 10 km |
| 73068 | 7b | 5 to 10°F | 15 km |
| 73026 | 7b | 5 to 10°F | 16 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 USC00346386, at 35.1808, -97.4378, elevation 344 m (1,128 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 76.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Norman 2nw Mesonet (7 km)
- Purcell 2 SW (22 km)
- Blanchard 2 SSW (22 km)
- Washington 6ssw Mesonet (23 km)
- Oklahoma City Will Rogers Airport (27 km)
- Spencer 2ene Mesonet (41 km)
- Lindsay 2 W (43 km)
- Oklahoma City Post Airport (44 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.