Frost dates for Castolon, TX
At Castolon, the median last spring frost (32°F) is Feb 18 and the median first fall frost is Nov 29, for a typical growing season of 284 days. For a 90% chance that the last frost has passed, wait until Mar 13. Nearby ZIP codes are in USDA hardiness zones 8a to 9a.
- Feb 18Last spring frost (median)50% chance of 32°F after this date
- Mar 13Safer planting date10% chance of 32°F after this date
- Nov 29First fall frost (median)50% chance of 32°F by this date
- 284 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 11 | Mar 5 | Mar 24 |
| 32°F | Jan 25 | Feb 18 | Mar 13 |
| 28°F | Jan 2 | Jan 31 | Mar 3 |
| 24°F | Dec 17 | Jan 12 | Feb 14 |
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 6 | Nov 20 | Dec 4 |
| 32°F | Nov 13 | Nov 29 | Dec 20 |
| 28°F | Nov 22 | Dec 11 | Jan 3 |
| 24°F | Dec 4 | Dec 25 | Jan 20 |
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 | 233 days | 258 days | 284 days |
| 32°F | 253 days | 284 days | 313 days |
| 28°F | 280 days | 315 days | 346 days |
| 24°F | 311 days | 346 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 98% |
| 24°F | 77% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 79834 | 8b | 15 to 20°F | 25 km |
| 79852 | 9a | 20 to 25°F | 28 km |
| 79846 | 8b | 15 to 20°F | 54 km |
| 79845 | 9a | 20 to 25°F | 103 km |
| 79842 | 8b | 15 to 20°F | 109 km |
| 79843 | 8a | 10 to 15°F | 119 km |
| 79830 | 8b | 15 to 20°F | 120 km |
| 79848 | 8b | 15 to 20°F | 154 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 USC00411524, at 29.1333, -103.5144, elevation 661 m (2,169 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 25.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Study Butte (22 km)
- Terlingua (25 km)
- Chisos Basin (26 km)
- Lajitas (28 km)
- Lake Ament (36 km)
- Panther Junction (37 km)
- Panther Junction 2 N (38 km)
- Terlingua Rch 2 (39 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.