Frost dates for Houston-Port, TX
At Houston-Port, the median last spring frost (32°F) is Feb 2 and the median first fall frost is Dec 25, for a typical growing season of 327 days. For a 90% chance that the last frost has passed, wait until Mar 5. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 2Last spring frost (median)50% chance of 32°F after this date
- Mar 5Safer planting date10% chance of 32°F after this date
- Dec 25First fall frost (median)50% chance of 32°F by this date
- 327 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 | Jan 22 | Feb 24 | Mar 16 |
| 32°F | Dec 31 | Feb 2 | Mar 5 |
| 28°F | Dec 24 | Jan 23 | Feb 25 |
| 24°F | Dec 29 | Jan 15 | 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 12 | Dec 2 | Jan 1 |
| 32°F | Nov 27 | Dec 25 | Jan 21 |
| 28°F | Dec 8 | Jan 5 | Feb 9 |
| 24°F | Dec 25 | Jan 10 | Feb 14 |
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 | 256 days | 287 days | 326 days |
| 32°F | 285 days | 327 days | 365 days |
| 28°F | 323 days | 364 days | 365 days |
| 24°F | 356 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 90% |
| 28°F | 55% |
| 24°F | 18% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 77011 | 9b | 25 to 30°F | 3 km |
| 77029 | 9b | 25 to 30°F | 3 km |
| 77012 | 9b | 25 to 30°F | 3 km |
| 77020 | 9b | 25 to 30°F | 4 km |
| 77547 | 9b | 25 to 30°F | 4 km |
| 77023 | 9b | 25 to 30°F | 5 km |
| 77003 | 9b | 25 to 30°F | 6 km |
| 77017 | 9b | 25 to 30°F | 7 km |
| 77204 | 9b | 25 to 30°F | 7 km |
| 77013 | 9b | 25 to 30°F | 7 km |
| 77026 | 9b | 25 to 30°F | 8 km |
| 77010 | 9b | 25 to 30°F | 8 km |
| 77002 | 9b | 25 to 30°F | 8 km |
| 77004 | 9b | 25 to 30°F | 8 km |
| 77028 | 9b | 25 to 30°F | 9 km |
| 77021 | 9b | 25 to 30°F | 9 km |
| 77506 | 9b | 25 to 30°F | 9 km |
| 77009 | 9b | 25 to 30°F | 10 km |
| 77015 | 9b | 25 to 30°F | 11 km |
| 77006 | 9b | 25 to 30°F | 11 km |
| 77078 | 9b | 25 to 30°F | 13 km |
| 77030 | 9b | 25 to 30°F | 13 km |
| 77007 | 9b | 25 to 30°F | 13 km |
| 77019 | 9b | 25 to 30°F | 13 km |
| 77016 | 9b | 25 to 30°F | 13 km |
| 77098 | 9b | 25 to 30°F | 13 km |
| 77503 | 9b | 25 to 30°F | 13 km |
| 77022 | 9b | 25 to 30°F | 14 km |
| 77005 | 9b | 25 to 30°F | 14 km |
| 77008 | 9b | 25 to 30°F | 14 km |
| 77046 | 9b | 25 to 30°F | 15 km |
| 77049 | 9b | 25 to 30°F | 16 km |
| 77027 | 9b | 25 to 30°F | 16 km |
| 77530 | 9b | 25 to 30°F | 17 km |
| 77018 | 9b | 25 to 30°F | 17 km |
| 77536 | 9b | 25 to 30°F | 17 km |
| 77401 | 9b | 25 to 30°F | 18 km |
| 77056 | 9b | 25 to 30°F | 18 km |
| 77081 | 9b | 25 to 30°F | 20 km |
| 77057 | 9b | 25 to 30°F | 20 km |
| 77055 | 9b | 25 to 30°F | 21 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 USC00414326, at 29.7456, -95.2800, elevation 6 m (19 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 5.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Houston Hobby Airport (12 km)
- Houston Clover Field (25 km)
- Houston Intercont Airport (27 km)
- Baytown (34 km)
- Houston NWSO (36 km)
- Houston Sugarland Mem (39 km)
- Sugar Land (39 km)
- Alvin (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.