When is the last frost in San Leandro, CA?

For ZIP code 94577, the average last spring frost (32°F) is January 7, based on NOAA 1991-2020 climate normals for the Oakland Metro Intl Ap, CA weather station. There is a 1-in-10 chance of a frost after February 8.

When is the first frost in San Leandro, CA?

The average first fall frost (32°F) is December 23. There is a 1-in-10 chance of frost by November 30, so tender plants are at risk from that point on.

How long is the growing season in 94577?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 356 days long.

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.

Frost dates for 94577San Leandro, CA

The average last spring frost in San Leandro is January 7 and the average first fall frost is December 23, giving a typical growing season of about 356 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 7
Average first fall frost: Dec 23
Growing season: 356 days

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.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
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)	Jan 3 · Feb 8 · Mar 7	Nov 15 · Dec 4 · Jan 5	302 days	98%
Frost / freeze (32°F)	Dec 13 · Jan 7 · Feb 8	Nov 30 · Dec 23 · Jan 24	356 days	63%
Hard freeze (28°F)	Dec 9 · Dec 30 · Jan 15	Dec 6 · Dec 28 · Jan 12	365 days	11%

Where these dates come from

ZIP code 94577 is matched to the NOAA station Oakland Metro Intl Ap, CA, 5.5 km away, at 6 ft elevation (43 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Oakland Metro Intl Ap, CA (used)	6 ft	Jan 7	Dec 23
Hayward Air Terminal, CA	43 ft	Jan 2	Dec 25
Oakland Museum, CA	30 ft	—	—
Berkeley, CA	310 ft	Jan 3	Jan 1

Frost dates near San Leandro

Oakland, CA 94603 · last Jan 7, first Dec 23
San Leandro, CA 94579 · last Jan 2, first Dec 25
San Lorenzo, CA 94580 · last Jan 2, first Dec 25
Castro Valley, CA 94546 · last Jan 2, first Dec 25
Alameda, CA 94502 · last Jan 7, first Dec 23
Hayward, CA 94541 · last Jan 2, first Dec 25
Canyon, CA 94516 · last Jan 3, first Jan 1
Piedmont, CA 94620 · last Jan 3, first Jan 1

Frequently asked questions

When is the last frost in San Leandro, CA?: For ZIP code 94577, the average last spring frost (32°F) is January 7, based on NOAA 1991-2020 climate normals for the Oakland Metro Intl Ap, CA weather station. There is a 1-in-10 chance of a frost after February 8.
When is the first frost in San Leandro, CA?: The average first fall frost (32°F) is December 23. There is a 1-in-10 chance of frost by November 30, so tender plants are at risk from that point on.
How long is the growing season in 94577?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 356 days long.
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.