Frost dates for Austin Great Hills, TX
At Austin Great Hills, the median last spring frost (32°F) is Mar 11 and the median first fall frost is Nov 20, for a typical growing season of 254 days. For a 90% chance that the last frost has passed, wait until Mar 29. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 11Last spring frost (median)50% chance of 32°F after this date
- Mar 29Safer planting date10% chance of 32°F after this date
- Nov 20First fall frost (median)50% chance of 32°F by this date
- 254 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 9a (20 to 25°F) · see all zone 9a frost dates
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 6 | Mar 25 | Apr 11 |
| 32°F | Feb 22 | Mar 11 | Mar 29 |
| 28°F | Jan 31 | Mar 1 | Mar 19 |
| 24°F | Jan 5 | 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 27 | Nov 10 | Nov 27 |
| 32°F | Nov 3 | Nov 20 | Dec 9 |
| 28°F | Nov 12 | Dec 3 | Dec 29 |
| 24°F | Nov 26 | Dec 20 | 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 | 207 days | 231 days | 256 days |
| 32°F | 230 days | 254 days | 278 days |
| 28°F | 252 days | 278 days | 309 days |
| 24°F | 274 days | 310 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 | 94% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78759 | 9a | 20 to 25°F | 1 km |
| 78750 | 9a | 20 to 25°F | 4 km |
| 78729 | 9a | 20 to 25°F | 5 km |
| 78727 | 9a | 20 to 25°F | 5 km |
| 78758 | 9a | 20 to 25°F | 6 km |
| 78726 | 9a | 20 to 25°F | 7 km |
| 78717 | 9a | 20 to 25°F | 8 km |
| 78728 | 9a | 20 to 25°F | 9 km |
| 78753 | 9a | 20 to 25°F | 10 km |
| 78613 | 9a | 20 to 25°F | 11 km |
| 78732 | 9a | 20 to 25°F | 13 km |
| 78681 | 9a | 20 to 25°F | 15 km |
| 78664 | 9a | 20 to 25°F | 15 km |
| 78660 | 9a | 20 to 25°F | 17 km |
| 78734 | 9a | 20 to 25°F | 18 km |
| 78645 | 9a | 20 to 25°F | 20 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 USC00410433, at 30.4144, -97.7664, elevation 268 m (880 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 27.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Austin-Camp Mabry (10 km)
- Austin 6S (21 km)
- Austin Bergstrom Airport (27 km)
- Georgetown Lake (29 km)
- Dripping Springs 6 E (30 km)
- Austin 33 NW (38 km)
- Elgin 1 N (38 km)
- Taylor 1NW (39 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.