Frost dates for Brenham, TX
At Brenham, the median last spring frost (32°F) is Mar 2 and the median first fall frost is Nov 30, for a typical growing season of 273 days. For a 90% chance that the last frost has passed, wait until Mar 20. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 2Last spring frost (median)50% chance of 32°F after this date
- Mar 20Safer planting date10% chance of 32°F after this date
- Nov 30First fall frost (median)50% chance of 32°F by this date
- 273 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 23 | Mar 13 | Apr 1 |
| 32°F | Jan 31 | Mar 2 | Mar 20 |
| 28°F | Jan 6 | Feb 10 | Mar 11 |
| 24°F | Dec 21 | Jan 25 | Mar 3 |
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 1 | Nov 17 | Dec 5 |
| 32°F | Nov 8 | Nov 30 | Dec 23 |
| 28°F | Nov 18 | Dec 18 | Jan 19 |
| 24°F | Dec 4 | Jan 3 | 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 | 222 days | 249 days | 274 days |
| 32°F | 242 days | 273 days | 306 days |
| 28°F | 268 days | 307 days | 344 days |
| 24°F | 302 days | 345 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 96% |
| 24°F | 67% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 77833 | 9a | 20 to 25°F | 5 km |
| 78931 | 9a | 20 to 25°F | 14 km |
| 78944 | 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 USC00411048, at 30.1592, -96.3972, elevation 95 m (313 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 18.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bellville 6nne (22 km)
- Somerville Dam (24 km)
- Washington State Park (29 km)
- College Station (48 km)
- Sealy (49 km)
- La Grange (53 km)
- Columbus (54 km)
- Eagle Lake Resch Center (60 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.