Frost dates for Alpine 7nw, TX
At Alpine 7nw, the median last spring frost (32°F) is Mar 17 and the median first fall frost is Nov 19, for a typical growing season of 246 days. For a 90% chance that the last frost has passed, wait until Apr 18. Nearby ZIP codes are in USDA hardiness zones 8a to 9a.
- Mar 17Last spring frost (median)50% chance of 32°F after this date
- Apr 18Safer planting date10% chance of 32°F after this date
- Nov 19First 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 11 | Apr 4 | Apr 28 |
| 32°F | Feb 23 | Mar 17 | Apr 18 |
| 28°F | Feb 1 | Mar 1 | Mar 31 |
| 24°F | Jan 3 | Feb 10 | 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 23 | Nov 8 | Nov 24 |
| 32°F | Nov 1 | Nov 19 | Dec 7 |
| 28°F | Nov 10 | Dec 1 | Jan 1 |
| 24°F | Nov 22 | Dec 18 | Jan 27 |
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 | 191 days | 218 days | 247 days |
| 32°F | 211 days | 246 days | 275 days |
| 28°F | 239 days | 274 days | 314 days |
| 24°F | 271 days | 310 days | 351 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 95% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 79830 | 8b | 15 to 20°F | 23 km |
| 79734 | 8a | 10 to 15°F | 40 km |
| 79718 | 8a | 10 to 15°F | 70 km |
| 79780 | 8a | 10 to 15°F | 75 km |
| 79843 | 8a | 10 to 15°F | 82 km |
| 79842 | 8b | 15 to 20°F | 83 km |
| 79854 | 8a | 10 to 15°F | 84 km |
| 79845 | 9a | 20 to 25°F | 99 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 USC00410176, at 30.3703, -103.7808, elevation 1500 m (4,922 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 40.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Alpine (12 km)
- Fort Davis (27 km)
- Marfa 3w (29 km)
- Mount Locke (44 km)
- Marathon (53 km)
- Balmorhea (68 km)
- Valentine (73 km)
- Kent 8se (78 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.