Frost dates for Ralston, OK
At Ralston, the median last spring frost (32°F) is Apr 11 and the median first fall frost is Oct 24, for a typical growing season of 196 days. For a 90% chance that the last frost has passed, wait until Apr 27. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 11Last spring frost (median)50% chance of 32°F after this date
- Apr 27Safer planting date10% chance of 32°F after this date
- Oct 24First fall frost (median)50% chance of 32°F by this date
- 196 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 | Apr 8 | Apr 23 | May 6 |
| 32°F | Mar 26 | Apr 11 | Apr 27 |
| 28°F | Mar 14 | Mar 31 | Apr 17 |
| 24°F | Mar 2 | Mar 18 | Apr 5 |
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 | Sep 29 | Oct 14 | Oct 28 |
| 32°F | Oct 7 | Oct 24 | Nov 6 |
| 28°F | Oct 17 | Nov 1 | Nov 17 |
| 24°F | Oct 25 | Nov 11 | Nov 29 |
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 | 154 days | 175 days | 197 days |
| 32°F | 174 days | 196 days | 216 days |
| 28°F | 195 days | 216 days | 238 days |
| 24°F | 214 days | 236 days | 261 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 |
|---|---|---|---|
| 74650 | 7a | 0 to 5°F | 3 km |
| 74637 | 7a | 0 to 5°F | 14 km |
| 74058 | 7a | 0 to 5°F | 16 km |
| 74633 | 7a | 0 to 5°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 USC00347390, at 36.5044, -96.7439, elevation 252 m (825 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 97.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Pawhuska (40 km)
- Red Rock 7sse Mesonet (40 km)
- Ponca City Muni Airport (41 km)
- Mannford 6 NW (45 km)
- Newkirk 8e Mesonet (46 km)
- Stillwater Regional Airport (49 km)
- Barnsdall (52 km)
- Stillwater 5 WNW (52 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.