Frost dates for Armstrong 4se, TX
At Armstrong 4se, the median last spring frost (32°F) is Feb 22 and the median first fall frost is Dec 5, for a typical growing season of 293 days. For a 90% chance that the last frost has passed, wait until Mar 14. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 22Last spring frost (median)50% chance of 32°F after this date
- Mar 14Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 293 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 8 | Mar 6 | Mar 27 |
| 32°F | Jan 19 | Feb 22 | Mar 14 |
| 28°F | Dec 22 | Jan 31 | Mar 8 |
| 24°F | Dec 17 | Jan 12 | Mar 2 |
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 24 | Dec 18 |
| 32°F | Nov 15 | Dec 5 | Jan 6 |
| 28°F | Nov 25 | Dec 22 | Feb 4 |
| 24°F | Dec 5 | Jan 3 | Feb 19 |
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 | 234 days | 263 days | 296 days |
| 32°F | 256 days | 293 days | 333 days |
| 28°F | 285 days | 331 days | 365 days |
| 24°F | 311 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 99% |
| 28°F | 84% |
| 24°F | 46% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78338 | 9b | 25 to 30°F | 3 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 USC00410345, at 26.8339, -97.7078, elevation 8 m (25 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 10.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Port Mansfield (42 km)
- Raymondville (42 km)
- Sarita 7 E (43 km)
- Edinburg 17 NNE (49 km)
- San Manuel (51 km)
- McCook (51 km)
- Falfurrias (53 km)
- Santa Rosa 3 WNW (65 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.