Frost dates for Study Butte, TX
At Study Butte, the median last spring frost (32°F) is Feb 21 and the median first fall frost is Nov 30, for a typical growing season of 282 days. For a 90% chance that the last frost has passed, wait until Mar 14. Nearby ZIP codes are in USDA hardiness zones 8a to 9a.
- Feb 21Last spring frost (median)50% chance of 32°F after this date
- Mar 14Safer planting date10% chance of 32°F after this date
- Nov 30First fall frost (median)50% chance of 32°F by this date
- 282 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 | Feb 17 | Mar 8 | Mar 31 |
| 32°F | Jan 29 | Feb 21 | Mar 14 |
| 28°F | Jan 8 | Feb 1 | Mar 3 |
| 24°F | Dec 19 | Jan 11 | Feb 9 |
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 | Nov 3 | Nov 20 | Dec 3 |
| 32°F | Nov 14 | Nov 30 | Dec 16 |
| 28°F | Nov 24 | Dec 11 | Jan 2 |
| 24°F | Dec 4 | Dec 22 | Jan 18 |
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 | 227 days | 255 days | 282 days |
| 32°F | 256 days | 282 days | 310 days |
| 28°F | 281 days | 311 days | 343 days |
| 24°F | 311 days | 344 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 99% |
| 24°F | 80% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 79852 | 9a | 20 to 25°F | 7 km |
| 79834 | 8b | 15 to 20°F | 33 km |
| 79846 | 8b | 15 to 20°F | 43 km |
| 79845 | 9a | 20 to 25°F | 89 km |
| 79842 | 8b | 15 to 20°F | 91 km |
| 79830 | 8b | 15 to 20°F | 98 km |
| 79843 | 8a | 10 to 15°F | 103 km |
| 79848 | 8b | 15 to 20°F | 142 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 USC00418714, at 29.3286, -103.5531, elevation 781 m (2,563 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 21.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Terlingua (5 km)
- Lake Ament (15 km)
- Lajitas (21 km)
- Terlingua Rch 2 (22 km)
- Castolon (22 km)
- Chisos Basin (25 km)
- Panther Junction 2 N (33 km)
- Panther Junction (34 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.