Frost dates for 78570Mercedes, TX
Frost occurs in about 44% of years near Mercedes, based on NOAA 1991-2020 records for the Weslaco, TX station.
Frost occurs in about 44% 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 28 · Mar 1 | Nov 25 · Dec 19 · Jan 27 | 331 days | 85% |
| Frost / freeze (32°F) | Dec 8 · Jan 8 · Feb 18 | Dec 3 · Dec 31 · Feb 7 | 365 days | 44% |
| Hard freeze (28°F) | — | — | 365 days | 10% |
Where these dates come from
ZIP code 78570 is matched to the NOAA station Weslaco, TX, 6 km away, at 75 ft elevation (16 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Weslaco, TX (used) | 75 ft | Jan 8 | Dec 31 |
| Santa Rosa 3 Wnw, TX | 50 ft | Jan 10 | Dec 27 |
| Harlingen, TX | 38 ft | Jan 9 | Jan 3 |
| Harlingen Rio Grande Ap, TX | 34 ft | Jan 8 | Dec 29 |
Frost dates near Mercedes
- Weslaco, TX 78599 · last Jan 8, first Dec 31
- Progreso, TX 78579 · last Jan 8, first Dec 31
- La Feria, TX 78559 · last Jan 10, first Dec 27
- Santa Maria, TX 78592 · last Jan 8, first Dec 31
- Donna, TX 78537 · last Jan 8, first Dec 31
- Santa Rosa, TX 78593 · last Jan 10, first Dec 27
- La Villa, TX 78562 · last Jan 10, first Dec 27
- Harlingen, TX 78552 · last Jan 9, first Jan 3
Frequently asked questions
- When is the last frost in Mercedes, TX?
- Frost occurs in about 44% of years at the nearest NOAA station (Weslaco, TX), so there is no reliable average last frost date.
- When is the first frost in Mercedes, TX?
- Frost occurs in about 44% 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.