Frost dates for 91030South Pasadena, CA
Frost occurs in about 13% of years near South Pasadena, based on NOAA 1991-2020 records for the Pasadena, CA station.
Frost occurs in about 13% 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 27 | Dec 5 · Dec 28 · Feb 7 | 344 days | 75% |
| Frost / freeze (32°F) | Dec 20 · Jan 8 · Feb 17 | Dec 20 · Jan 7 · Feb 14 | 365 days | 13% |
| Hard freeze (28°F) | — | — | 365 days | 0% |
Where these dates come from
ZIP code 91030 is matched to the NOAA station Pasadena, CA, 4.3 km away, at 864 ft elevation (221 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Pasadena, CA (used) | 864 ft | Jan 8 | Jan 7 |
| San Gabriel Fire Dept, CA | 363 ft | Jan 4 | Jan 2 |
| Los Angeles Dwtn Usc Campus, CA | 230 ft | — | — |
| Mt Wilson Cbs, CA | 5,710 ft | Apr 28 | Nov 15 |
Frost dates near South Pasadena
- South Pasadena, CA 91031 · last Jan 8, first Jan 7
- Pasadena, CA 91105 · last Jan 8, first Jan 7
- Alhambra, CA 91802 · last Jan 4, first Jan 2
- Los Angeles, CA 90042 · last Jan 8, first Jan 7
- San Marino, CA 91108 · last Jan 4, first Jan 2
- San Gabriel, CA 91778 · last Jan 4, first Jan 2
- Monterey Park, CA 91756 · last Jan 4, first Jan 2
- Rosemead, CA 91770 · last Jan 4, first Jan 2
Frequently asked questions
- When is the last frost in South Pasadena, CA?
- Frost occurs in about 13% of years at the nearest NOAA station (Pasadena, CA), so there is no reliable average last frost date.
- When is the first frost in South Pasadena, CA?
- Frost occurs in about 13% 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.