Frost dates for Crystal City, TX
At Crystal City, the median last spring frost (32°F) is Feb 10 and the median first fall frost is Dec 10, for a typical growing season of 307 days. For a 90% chance that the last frost has passed, wait until Mar 9. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 10Last spring frost (median)50% chance of 32°F after this date
- Mar 9Safer planting date10% chance of 32°F after this date
- Dec 10First fall frost (median)50% chance of 32°F by this date
- 307 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 2 | Feb 28 | Mar 18 |
| 32°F | Jan 6 | Feb 10 | Mar 9 |
| 28°F | Dec 15 | Jan 20 | Feb 28 |
| 24°F | Dec 12 | Jan 4 | Feb 13 |
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 8 | Nov 28 | Dec 19 |
| 32°F | Nov 19 | Dec 10 | Jan 9 |
| 28°F | Dec 1 | Dec 26 | Feb 6 |
| 24°F | Dec 7 | Jan 1 | Feb 5 |
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 | 246 days | 275 days | 308 days |
| 32°F | 270 days | 307 days | 345 days |
| 28°F | 302 days | 346 days | 365 days |
| 24°F | 341 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 98% |
| 28°F | 77% |
| 24°F | 31% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78839 | 9a | 20 to 25°F | 10 km |
| 78872 | 9a | 20 to 25°F | 26 km |
| 78829 | 9a | 20 to 25°F | 34 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 USC00412160, at 28.6794, -99.8311, elevation 177 m (580 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 8.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Carrizo Springs 3s (22 km)
- Dilley (63 km)
- Eagle Pass 3n (64 km)
- Cotulla La Salle Co Airport (65 km)
- Encinal (89 km)
- Brackettville (91 km)
- Fowlerton (99 km)
- Hondo Muni Airport (99 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.