Frost dates for Chisos Basin, TX
At Chisos Basin, the median last spring frost (32°F) is Mar 10 and the median first fall frost is Nov 19, for a typical growing season of 252 days. For a 90% chance that the last frost has passed, wait until Apr 6. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 10Last spring frost (median)50% chance of 32°F after this date
- Apr 6Safer planting date10% chance of 32°F after this date
- Nov 19First fall frost (median)50% chance of 32°F by this date
- 252 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 4 | Mar 31 | Apr 22 |
| 32°F | Feb 12 | Mar 10 | Apr 6 |
| 28°F | Jan 19 | Feb 21 | Mar 21 |
| 24°F | Dec 23 | Jan 31 | Mar 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 | Oct 21 | Nov 8 | Nov 28 |
| 32°F | Oct 29 | Nov 19 | Dec 9 |
| 28°F | Nov 4 | Dec 2 | Jan 1 |
| 24°F | Nov 15 | Dec 18 | Jan 24 |
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 | 193 days | 224 days | 253 days |
| 32°F | 215 days | 252 days | 290 days |
| 28°F | 243 days | 285 days | 328 days |
| 24°F | 278 days | 322 days | 363 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 99% |
| 24°F | 90% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 79834 | 8b | 15 to 20°F | 10 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 USC00411715, at 29.2703, -103.3003, elevation 1615 m (5,300 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 29.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Panther Junction (11 km)
- Panther Junction 2 N (12 km)
- Terlingua Rch 2 (25 km)
- Study Butte (25 km)
- Castolon (26 km)
- Lake Ament (28 km)
- Terlingua (30 km)
- Boquillas Ranger Station (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.