Frost dates for Sam Rayburn Dam, TX
At Sam Rayburn Dam, the median last spring frost (32°F) is Feb 24 and the median first fall frost is Dec 1, for a typical growing season of 280 days. For a 90% chance that the last frost has passed, wait until Mar 23. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 24Last spring frost (median)50% chance of 32°F after this date
- Mar 23Safer planting date10% chance of 32°F after this date
- Dec 1First fall frost (median)50% chance of 32°F by this date
- 280 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 17 | Mar 13 | Apr 4 |
| 32°F | Jan 28 | Feb 24 | Mar 23 |
| 28°F | Jan 7 | Feb 3 | Mar 5 |
| 24°F | Dec 27 | Jan 23 | Feb 24 |
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 19 | Dec 6 |
| 32°F | Nov 9 | Dec 1 | Dec 27 |
| 28°F | Nov 26 | Dec 22 | Jan 21 |
| 24°F | Dec 11 | Jan 5 | 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 | 220 days | 249 days | 280 days |
| 32°F | 248 days | 280 days | 316 days |
| 28°F | 280 days | 317 days | 353 days |
| 24°F | 313 days | 353 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 94% |
| 24°F | 62% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 75931 | 9a | 20 to 25°F | 11 km |
| 75951 | 9a | 20 to 25°F | 15 km |
| 75929 | 9a | 20 to 25°F | 20 km |
| 75980 | 9a | 20 to 25°F | 24 km |
| 75968 | 9a | 20 to 25°F | 25 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 USC00417936, at 31.0619, -94.1011, elevation 58 m (189 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 30.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Town Bluff Dam (31 km)
- San Augustine (51 km)
- Toledo Bend Dam (53 km)
- Lufkin Angelina Co Airport (65 km)
- Wildwood (67 km)
- Nacogdoches (80 km)
- Center (83 km)
- Lufkin 11 NW (86 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.