Frost dates for 78578Port Isabel, TX
Frost occurs in about 34% of years near Port Isabel, based on NOAA 1991-2020 records for the Port Isabel, TX station.
Frost occurs in about 34% of years. Frost-tender plants can usually grow year-round, but cover them if a rare cold snap is forecast.
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Dec 18 · Jan 17 · Feb 24 | Dec 1 · Dec 25 · Jan 31 | 347 days | 76% |
| Frost / freeze (32°F) | Dec 11 · Jan 3 · Feb 2 | Dec 7 · Jan 1 · Feb 1 | 365 days | 34% |
| Hard freeze (28°F) | Dec 12 · Jan 2 · Jan 22 | Dec 12 · Jan 1 · Jan 20 | 365 days | 11% |
Where these dates come from
ZIP code 78578 is matched to the NOAA station Port Isabel, TX, 4.5 km away, at 17 ft elevation (17 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Port Isabel, TX (used) | 17 ft | Jan 3 | Jan 1 |
| Port Isabel Cameron Ap, TX | 19 ft | Jan 8 | Jan 4 |
| Wfo Brownsville, TX | 15 ft | Jan 9 | Jan 4 |
| Brownsville, TX | 23 ft | Jan 6 | Jan 2 |
Frost dates near Port Isabel
- Los Fresnos, TX 78566 · last Jan 8, first Jan 4
- Brownsville, TX 78526 · last Jan 6, first Jan 2
- Olmito, TX 78575 · last Jan 6, first Jan 2
- South Padre Island, TX 78597 · last Jan 8, first Jan 4
- Lozano, TX 78568 · last Jan 8, first Dec 29
- Rio Hondo, TX 78583 · last Jan 8, first Dec 29
- San Benito, TX 78586 · last Jan 9, first Jan 3
- Harlingen, TX 78550 · last Jan 9, first Jan 3
Frequently asked questions
- When is the last frost in Port Isabel, TX?
- Frost occurs in about 34% of years at the nearest NOAA station (Port Isabel, TX), so there is no reliable average last frost date.
- When is the first frost in Port Isabel, TX?
- Frost occurs in about 34% of years at the nearest NOAA station.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.