Frost dates for San Antonio Incarnate Word, TX
At San Antonio Incarnate Word, the median last spring frost (32°F) is Feb 25 and the median first fall frost is Nov 28, for a typical growing season of 277 days. For a 90% chance that the last frost has passed, wait until Mar 19. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 25Last spring frost (median)50% chance of 32°F after this date
- Mar 19Safer planting date10% chance of 32°F after this date
- Nov 28First fall frost (median)50% chance of 32°F by this date
- 277 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 18 | Mar 10 | Apr 2 |
| 32°F | Jan 28 | Feb 25 | Mar 19 |
| 28°F | Dec 31 | Feb 5 | Mar 5 |
| 24°F | Dec 18 | Jan 22 | Feb 25 |
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 30 | Nov 16 | Dec 3 |
| 32°F | Nov 7 | Nov 28 | Dec 21 |
| 28°F | Nov 19 | Dec 15 | Jan 20 |
| 24°F | Dec 3 | Jan 1 | Feb 4 |
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 | 223 days | 251 days | 279 days |
| 32°F | 249 days | 277 days | 313 days |
| 28°F | 275 days | 315 days | 356 days |
| 24°F | 311 days | 355 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 | 65% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78212 | 9a | 20 to 25°F | 2 km |
| 78209 | 9a | 20 to 25°F | 3 km |
| 78215 | 9a | 20 to 25°F | 3 km |
| 78234 | 9a | 20 to 25°F | 3 km |
| 78208 | 9a | 20 to 25°F | 4 km |
| 78202 | 9a | 20 to 25°F | 5 km |
| 78205 | 9a | 20 to 25°F | 5 km |
| 78201 | 9a | 20 to 25°F | 5 km |
| 78203 | 9a | 20 to 25°F | 6 km |
| 78218 | 9a | 20 to 25°F | 8 km |
| 78219 | 9a | 20 to 25°F | 9 km |
| 78220 | 9a | 20 to 25°F | 10 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 USC00417947, at 29.4703, -98.4728, elevation 213 m (700 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 22.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- San Antonio Intl Airport (8 km)
- San Antonio Kelly AFB (14 km)
- San Antonio Stinson Airport (15 km)
- Randolph AFB (21 km)
- San Antonio/seaworld (22 km)
- New Braunfels (37 km)
- Lytle 3w (44 km)
- Boerne (44 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.