Frost dates for Blanco, TX
At Blanco, the median last spring frost (32°F) is Mar 20 and the median first fall frost is Nov 10, for a typical growing season of 236 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 20Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 236 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 14 | Apr 3 | Apr 24 |
| 32°F | Feb 28 | Mar 20 | Apr 8 |
| 28°F | Feb 8 | Mar 6 | Mar 28 |
| 24°F | Jan 17 | Feb 21 | Mar 16 |
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 18 | Nov 1 | Nov 16 |
| 32°F | Oct 27 | Nov 10 | Dec 2 |
| 28°F | Nov 3 | Nov 23 | Dec 16 |
| 24°F | Nov 15 | Dec 8 | Jan 7 |
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 | 188 days | 213 days | 237 days |
| 32°F | 209 days | 236 days | 263 days |
| 28°F | 235 days | 262 days | 296 days |
| 24°F | 261 days | 296 days | 335 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 98% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78606 | 8b | 15 to 20°F | 4 km |
| 78027 | 8b | 15 to 20°F | 17 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 USC00410832, at 30.0950, -98.4142, elevation 399 m (1,310 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 44.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Johnson City 2n (23 km)
- Canyon Dam (33 km)
- Dripping Springs 6 E (43 km)
- Boerne (45 km)
- Fredericksburg (50 km)
- San Marcos (51 km)
- New Braunfels (54 km)
- New Braunfels WFO (57 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.