Frost dates for Rockport, TX
At Rockport, the median last spring frost (32°F) is Jan 31 and the median first fall frost is Dec 25, for a typical growing season of 328 days. For a 90% chance that the last frost has passed, wait until Feb 28. Nearby ZIP codes are in USDA hardiness zones 9b to 10a.
- Jan 31Last spring frost (median)50% chance of 32°F after this date
- Feb 28Safer planting date10% chance of 32°F after this date
- Dec 25First fall frost (median)50% chance of 32°F by this date
- 328 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 18 | Feb 16 | Mar 10 |
| 32°F | Dec 26 | Jan 31 | Feb 28 |
| 28°F | Dec 19 | Jan 20 | Feb 20 |
| 24°F | Dec 18 | Jan 7 | Feb 6 |
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 15 | Dec 6 | Jan 3 |
| 32°F | Nov 28 | Dec 25 | Jan 31 |
| 28°F | Dec 11 | Jan 5 | Feb 8 |
| 24°F | Dec 15 | Jan 4 | Feb 2 |
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 | 262 days | 295 days | 330 days |
| 32°F | 289 days | 328 days | 365 days |
| 28°F | 322 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 | 99% |
| 32°F | 89% |
| 28°F | 53% |
| 24°F | 18% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 78358 | 10a | 30 to 35°F | 6 km |
| 78382 | 9b | 25 to 30°F | 11 km |
| 78336 | 10a | 30 to 35°F | 15 km |
| 78340 | 9b | 25 to 30°F | 18 km |
| 78362 | 10a | 30 to 35°F | 23 km |
| 78359 | 9b | 25 to 30°F | 26 km |
| 78373 | 10a | 30 to 35°F | 28 km |
| 78374 | 10a | 30 to 35°F | 28 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 USC00417704, at 28.0183, -97.0561, elevation 2 m (8 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 4.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Rockport Aransas Co Airport (7 km)
- Port Aransas (20 km)
- Port Aransas 11 SSW (37 km)
- Welder Wildlife Foundation (37 km)
- Port Aransas 32 NNE (39 km)
- Aransas Wr (41 km)
- Refugio 3 SW (41 km)
- Refugio 2 NW (42 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.