Frost dates for Altus AFB, OK
At Altus AFB, the median last spring frost (32°F) is Mar 26 and the median first fall frost is Nov 10, for a typical growing season of 229 days. For a 90% chance that the last frost has passed, wait until Apr 14. Nearby ZIP codes are in USDA hardiness zone 8a.
- Mar 26Last spring frost (median)50% chance of 32°F after this date
- Apr 14Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 229 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 22 | Apr 8 | Apr 24 |
| 32°F | Mar 8 | Mar 26 | Apr 14 |
| 28°F | Feb 23 | Mar 11 | Apr 1 |
| 24°F | Feb 4 | Feb 28 | Mar 17 |
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 20 | Nov 2 | Nov 15 |
| 32°F | Oct 26 | Nov 10 | Nov 27 |
| 28°F | Nov 2 | Nov 21 | Dec 8 |
| 24°F | Nov 12 | Dec 2 | Dec 22 |
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 | 185 days | 207 days | 227 days |
| 32°F | 205 days | 229 days | 250 days |
| 28°F | 226 days | 252 days | 276 days |
| 24°F | 250 days | 277 days | 309 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 |
|---|---|---|---|
| 73542 | 8a | 10 to 15°F | 5 km |
| 73551 | 8a | 10 to 15°F | 11 km |
| 73530 | 8a | 10 to 15°F | 14 km |
| 76364 | 8a | 10 to 15°F | 25 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 USW00003981, at 34.3622, -98.9761, elevation 386 m (1,267 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 64.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Frederick (5 km)
- Tipton 4s Mesonet (17 km)
- Grandfield 3w Mesonet (25 km)
- Chattanooga (31 km)
- Altus Irig Rsch Station (41 km)
- Altus 3s Mesonet (42 km)
- Wichita Mountain Wr (48 km)
- Lawton (55 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.