Frost dates for Del Rio 4nw, TX
At Del Rio 4nw, the median last spring frost (32°F) is Feb 19 and the median first fall frost is Dec 4, for a typical growing season of 290 days. For a 90% chance that the last frost has passed, wait until Mar 11. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Feb 19Last spring frost (median)50% chance of 32°F after this date
- Mar 11Safer planting date10% chance of 32°F after this date
- Dec 4First fall frost (median)50% chance of 32°F by this date
- 290 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 13 | Mar 4 | Mar 25 |
| 32°F | Jan 24 | Feb 19 | Mar 11 |
| 28°F | Dec 25 | Jan 31 | Mar 1 |
| 24°F | Dec 11 | Jan 7 | Feb 10 |
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 5 | Nov 23 | Dec 8 |
| 32°F | Nov 16 | Dec 4 | Dec 20 |
| 28°F | Nov 28 | Dec 19 | Jan 20 |
| 24°F | Dec 8 | Dec 29 | Feb 1 |
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 | 235 days | 263 days | 290 days |
| 32°F | 260 days | 290 days | 320 days |
| 28°F | 289 days | 327 days | 360 days |
| 24°F | 328 days | 364 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 95% |
| 24°F | 56% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78843 | 9a | 20 to 25°F | 15 km |
| 78842 | 9a | 20 to 25°F | 27 km |
| 78840 | 8b | 15 to 20°F | 36 km |
| 78832 | 9a | 20 to 25°F | 52 km |
| 78877 | 9a | 20 to 25°F | 59 km |
| 78837 | 8b | 15 to 20°F | 68 km |
| 78841 | 8b | 15 to 20°F | 72 km |
| 78852 | 9a | 20 to 25°F | 85 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 USC00412361, at 29.4078, -100.9275, elevation 320 m (1,051 ft).
- Data quality: Representative (10+ years), 17 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
- Del Rio Intl Airport (3 km)
- Amistad Dam (11 km)
- Carta Valley (49 km)
- Brackettville (51 km)
- Brackettville 22 N (51 km)
- Hudspeth River Rch (71 km)
- Langtry (76 km)
- Eagle Pass 3n (84 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.