Frost dates for 94579San Leandro, CA
Frost occurs in about 45% of years near San Leandro, based on NOAA 1991-2020 records for the Hayward Air Terminal, CA station.
Frost occurs in about 45% 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 30 · Jan 29 · Feb 28 | Nov 24 · Dec 12 · Jan 11 | 322 days | 93% |
| Frost / freeze (32°F) | Dec 13 · Jan 2 · Jan 27 | Dec 6 · Dec 25 · Jan 20 | 365 days | 45% |
| Hard freeze (28°F) | — | — | 365 days | 5% |
Where these dates come from
ZIP code 94579 is matched to the NOAA station Hayward Air Terminal, CA, 5 km away, at 43 ft elevation (27 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hayward Air Terminal, CA (used) | 43 ft | Jan 2 | Dec 25 |
| Oakland Metro Intl Ap, CA | 6 ft | Jan 7 | Dec 23 |
| Oakland Museum, CA | 30 ft | — | — |
| Fremont, CA | 38 ft | Jan 7 | Dec 22 |
Frost dates near San Leandro
- San Lorenzo, CA 94580 · last Jan 2, first Dec 25
- San Leandro, CA 94578 · last Jan 2, first Dec 25
- Hayward, CA 94541 · last Jan 2, first Dec 25
- Oakland, CA 94603 · last Jan 7, first Dec 23
- Castro Valley, CA 94546 · last Jan 2, first Dec 25
- Alameda, CA 94502 · last Jan 7, first Dec 23
- Union City, CA 94587 · last Jan 7, first Dec 22
- Fremont, CA 94555 · last Jan 7, first Dec 22
Frequently asked questions
- When is the last frost in San Leandro, CA?
- Frost occurs in about 45% of years at the nearest NOAA station (Hayward Air Terminal, CA), so there is no reliable average last frost date.
- When is the first frost in San Leandro, CA?
- Frost occurs in about 45% 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.