Frost dates for Boquillas Ranger Station, TX
At Boquillas Ranger Station, the median last spring frost (32°F) is Mar 12 and the median first fall frost is Nov 15, for a typical growing season of 246 days. For a 90% chance that the last frost has passed, wait until Apr 1. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 12Last spring frost (median)50% chance of 32°F after this date
- Apr 1Safer planting date10% chance of 32°F after this date
- Nov 15First fall frost (median)50% chance of 32°F by this date
- 246 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 7 | Mar 27 | Apr 13 |
| 32°F | Feb 24 | Mar 12 | Apr 1 |
| 28°F | Feb 12 | Mar 1 | Mar 17 |
| 24°F | Jan 28 | Feb 15 | Mar 7 |
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 22 | Nov 5 | Nov 19 |
| 32°F | Oct 30 | Nov 15 | Nov 30 |
| 28°F | Nov 9 | Nov 25 | Dec 10 |
| 24°F | Nov 18 | Dec 4 | Dec 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 | 202 days | 224 days | 246 days |
| 32°F | 222 days | 246 days | 268 days |
| 28°F | 243 days | 268 days | 288 days |
| 24°F | 265 days | 290 days | 320 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 79834 | 8b | 15 to 20°F | 29 km |
| 79852 | 9a | 20 to 25°F | 66 km |
| 79842 | 8b | 15 to 20°F | 92 km |
| 79846 | 8b | 15 to 20°F | 102 km |
| 79848 | 8b | 15 to 20°F | 117 km |
| 79830 | 8b | 15 to 20°F | 131 km |
| 79845 | 9a | 20 to 25°F | 148 km |
| 78871 | 8b | 15 to 20°F | 152 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 USC00410950, at 29.1853, -102.9622, elevation 566 m (1,858 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 53.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rio Grande Village (0 km)
- Panther Junction (28 km)
- Panther Junction 2 N (30 km)
- Chisos Basin (34 km)
- Terlingua Rch 2 (54 km)
- Castolon (54 km)
- Persimmon Gap (57 km)
- Study Butte (59 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.