When is the last frost in Gridley, CA?

For ZIP code 95948, the average last spring frost (32°F) is January 29, based on NOAA 1991-2020 climate normals for the Oroville Muni Ap, CA weather station. There is a 1-in-10 chance of a frost after February 28.

When is the first frost in Gridley, CA?

The average first fall frost (32°F) is December 7. There is a 1-in-10 chance of frost by November 20, so tender plants are at risk from that point on.

How long is the growing season in 95948?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 317 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 95948Gridley, CA

The average last spring frost in Gridley is January 29 and the average first fall frost is December 7, giving a typical growing season of about 317 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 29
Average first fall frost: Dec 7
Growing season: 317 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 4 · Mar 6 · Apr 1	Nov 7 · Nov 24 · Dec 10	261 days	100%
Frost / freeze (32°F)	Dec 28 · Jan 29 · Feb 28	Nov 20 · Dec 7 · Jan 6	317 days	95%
Hard freeze (28°F)	Dec 16 · Jan 9 · Feb 6	Dec 2 · Dec 27 · Jan 26	360 days	57%

Where these dates come from

ZIP code 95948 is matched to the NOAA station Oroville Muni Ap, CA, 17.3 km away, at 190 ft elevation (101 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Oroville Muni Ap, CA (used)	190 ft	Jan 29	Dec 7
Oroville, CA	171 ft	Jan 30	Dec 13
Marysville, CA	57 ft	Jan 15	Dec 12
Marysville Yuba Co Ap, CA	62 ft	Feb 11	Nov 30

Frost dates near Gridley

Biggs, CA 95917 · last Jan 29, first Dec 7
Live Oak, CA 95953 · last Feb 11, first Nov 30
Richvale, CA 95974 · last Jan 29, first Dec 7
Palermo, CA 95968 · last Jan 30, first Dec 13
Sutter, CA 95982 · last Feb 11, first Nov 30
Nelson, CA 95958 · last Jan 29, first Dec 7
Butte City, CA 95920 · last Feb 14, first Dec 1
Oroville, CA 95966 · last Jan 30, first Dec 13

Frequently asked questions

When is the last frost in Gridley, CA?: For ZIP code 95948, the average last spring frost (32°F) is January 29, based on NOAA 1991-2020 climate normals for the Oroville Muni Ap, CA weather station. There is a 1-in-10 chance of a frost after February 28.
When is the first frost in Gridley, CA?: The average first fall frost (32°F) is December 7. There is a 1-in-10 chance of frost by November 20, so tender plants are at risk from that point on.
How long is the growing season in 95948?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 317 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.