Frost dates for Port O'connor, TX
At Port O'connor, the median last spring frost (32°F) is Feb 4 and the median first fall frost is Dec 27, for a typical growing season of 323 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 4Last spring frost (median)50% chance of 32°F after this date
- Mar 6Safer planting date10% chance of 32°F after this date
- Dec 27First fall frost (median)50% chance of 32°F by this date
- 323 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 21 | Feb 20 | Mar 13 |
| 32°F | Dec 29 | Feb 4 | Mar 6 |
| 28°F | Dec 15 | Jan 27 | Mar 1 |
| 24°F | Dec 8 | Jan 23 | Mar 5 |
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 6 | Jan 9 |
| 32°F | Nov 20 | Dec 27 | Feb 4 |
| 28°F | Nov 27 | Jan 4 | Feb 20 |
| 24°F | Nov 30 | Jan 9 | Mar 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 | 255 days | 291 days | 328 days |
| 32°F | 282 days | 323 days | 365 days |
| 28°F | 310 days | 364 days | 365 days |
| 24°F | 342 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 99% |
| 32°F | 88% |
| 28°F | 51% |
| 24°F | 18% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 77982 | 9b | 25 to 30°F | 6 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 USC00417186, at 28.4342, -96.4278, elevation 2 m (5 ft).
- Data quality: Representative (10+ years), 13 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
- Point Comfort (28 km)
- Palacios Muni Airport (37 km)
- Aransas Wr (39 km)
- Austwell (41 km)
- Port Aransas 32 NNE (41 km)
- Matagorda No. 2 (52 km)
- Victoria Regional Airport (66 km)
- Victoria Regional Airport (68 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.