Frost dates for Alvin, TX
At Alvin, the median last spring frost (32°F) is Feb 14 and the median first fall frost is Dec 5, for a typical growing season of 298 days. For a 90% chance that the last frost has passed, wait until Mar 13. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 14Last spring frost (median)50% chance of 32°F after this date
- Mar 13Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 298 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 4 | Mar 5 | Mar 27 |
| 32°F | Jan 15 | Feb 14 | Mar 13 |
| 28°F | Dec 23 | Jan 25 | Mar 2 |
| 24°F | Dec 15 | Jan 14 | Feb 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 | Nov 5 | Nov 23 | Dec 15 |
| 32°F | Nov 14 | Dec 5 | Jan 8 |
| 28°F | Nov 27 | Dec 30 | Feb 2 |
| 24°F | Dec 8 | Jan 4 | Feb 1 |
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 | 238 days | 264 days | 298 days |
| 32°F | 261 days | 298 days | 335 days |
| 28°F | 294 days | 336 days | 365 days |
| 24°F | 334 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 99% |
| 28°F | 84% |
| 24°F | 42% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 77511 | 9b | 25 to 30°F | 2 km |
| 77517 | 9b | 25 to 30°F | 9 km |
| 77577 | 9b | 25 to 30°F | 12 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 USC00410204, at 29.3653, -95.2336, elevation 8 m (28 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 10.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Houston Clover Field (17 km)
- Houston NWSO (19 km)
- Houston Hobby Airport (31 km)
- Angleton 2 W (32 km)
- Angleton Brazoria Airport (36 km)
- Galveston Scholes Field (38 km)
- Thompsons 3 WSW (41 km)
- Houston-Port (43 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.