When is the last frost in Cupertino, CA?

For ZIP code 95015, the average last spring frost (32°F) is February 2, based on NOAA 1991-2020 climate normals for the Los Gatos, CA weather station. There is a 1-in-10 chance of a frost after March 14.

When is the first frost in Cupertino, CA?

The average first fall frost (32°F) is December 6. There is a 1-in-10 chance of frost by November 16, so tender plants are at risk from that point on.

How long is the growing season in 95015?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 310 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 95015Cupertino, CA

The average last spring frost in Cupertino is February 2 and the average first fall frost is December 6, giving a typical growing season of about 310 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 2
Average first fall frost: Dec 6
Growing season: 310 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)	Feb 16 · Mar 20 · Apr 16	Nov 4 · Nov 20 · Dec 5	241 days	100%
Frost / freeze (32°F)	Dec 31 · Feb 2 · Mar 14	Nov 16 · Dec 6 · Jan 7	310 days	97%
Hard freeze (28°F)	Dec 9 · Jan 1 · Jan 26	Nov 28 · Dec 19 · Jan 13	356 days	58%

Where these dates come from

ZIP code 95015 is matched to the NOAA station Los Gatos, CA, 13.1 km away, at 365 ft elevation (40 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Los Gatos, CA (used)	365 ft	Feb 2	Dec 6
Moffett Federal Airfield, CA	39 ft	Jan 6	Dec 23
Skyline Ridge Preserve, CA	2,270 ft	Mar 21	Dec 15
San Jose, CA	51 ft	Jan 12	Dec 22

Frost dates near Cupertino

Cupertino, CA 95014 · last Feb 2, first Dec 6
Sunnyvale, CA 94087 · last Jan 6, first Dec 23
San Jose, CA 95170 · last Feb 2, first Dec 6
Los Altos, CA 94024 · last Jan 6, first Dec 23
Saratoga, CA 95070 · last Feb 2, first Dec 6
Santa Clara, CA 95051 · last Jan 12, first Dec 22
Mountain View, CA 94035 · last Jan 6, first Dec 23
Campbell, CA 95011 · last Jan 2, first Dec 25

Frequently asked questions

When is the last frost in Cupertino, CA?: For ZIP code 95015, the average last spring frost (32°F) is February 2, based on NOAA 1991-2020 climate normals for the Los Gatos, CA weather station. There is a 1-in-10 chance of a frost after March 14.
When is the first frost in Cupertino, CA?: The average first fall frost (32°F) is December 6. There is a 1-in-10 chance of frost by November 16, so tender plants are at risk from that point on.
How long is the growing season in 95015?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 310 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.