Frost dates for Sinton, TX
At Sinton, the median last spring frost (32°F) is Feb 1 and the median first fall frost is Dec 17, for a typical growing season of 324 days. For a 90% chance that the last frost has passed, wait until Mar 6. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 1Last spring frost (median)50% chance of 32°F after this date
- Mar 6Safer planting date10% chance of 32°F after this date
- Dec 17First fall frost (median)50% chance of 32°F by this date
- 324 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 25 | Mar 16 |
| 32°F | Dec 27 | Feb 1 | Mar 6 |
| 28°F | Dec 14 | Jan 12 | Feb 24 |
| 24°F | Dec 12 | Jan 3 | Feb 13 |
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 10 | Dec 1 | Dec 28 |
| 32°F | Nov 22 | Dec 17 | Jan 17 |
| 28°F | Dec 3 | Jan 1 | Feb 2 |
| 24°F | Dec 10 | Jan 1 | Feb 6 |
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 | 254 days | 284 days | 322 days |
| 32°F | 282 days | 324 days | 361 days |
| 28°F | 319 days | 361 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 | 93% |
| 28°F | 58% |
| 24°F | 19% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78387 | 9b | 25 to 30°F | 4 km |
| 78370 | 9b | 25 to 30°F | 13 km |
| 78352 | 9b | 25 to 30°F | 16 km |
| 78391 | 9b | 25 to 30°F | 22 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 USC00418354, at 28.0422, -97.5428, elevation 15 m (48 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 7.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Welder Wildlife Foundation (15 km)
- Corpus Christi (29 km)
- Corpus Christi NWS (29 km)
- Robstown (30 km)
- Mathis 4 SSW (32 km)
- Refugio 3 SW (35 km)
- Corpus Christi Cabaniss Field (40 km)
- Refugio 2 NW (40 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.