Frost dates for Boerne, TX
At Boerne, the median last spring frost (32°F) is Mar 15 and the median first fall frost is Nov 13, for a typical growing season of 243 days. For a 90% chance that the last frost has passed, wait until Apr 8. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 15Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer planting date10% chance of 32°F after this date
- Nov 13First fall frost (median)50% chance of 32°F by this date
- 243 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 9 | Apr 1 | Apr 22 |
| 32°F | Feb 23 | Mar 15 | Apr 8 |
| 28°F | Jan 31 | Mar 2 | Mar 23 |
| 24°F | Dec 31 | Feb 13 | Mar 11 |
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 21 | Nov 4 | Nov 21 |
| 32°F | Oct 31 | Nov 13 | Dec 4 |
| 28°F | Nov 5 | Nov 27 | Dec 21 |
| 24°F | Nov 17 | Dec 11 | Jan 15 |
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 | 193 days | 218 days | 244 days |
| 32°F | 216 days | 243 days | 270 days |
| 28°F | 239 days | 270 days | 306 days |
| 24°F | 268 days | 305 days | 349 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 96% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78006 | 8b | 15 to 20°F | 7 km |
| 78015 | 8b | 15 to 20°F | 10 km |
| 78074 | 8b | 15 to 20°F | 17 km |
| 78255 | 8b | 15 to 20°F | 18 km |
| 78004 | 8b | 15 to 20°F | 20 km |
| 78063 | 8b | 15 to 20°F | 21 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 USC00410902, at 29.7986, -98.7353, elevation 440 m (1,445 ft).
- Data quality: Standard (24+ years of data), 26 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
- San Antonio Intl Airport (37 km)
- San Antonio/seaworld (39 km)
- San Antonio Incarnate Word (44 km)
- Blanco (45 km)
- Kerrville 3 NNE (47 km)
- San Antonio Kelly AFB (48 km)
- Medina 1ne (50 km)
- Fredericksburg (52 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.