When is the last frost in Obrien, CA?

For ZIP code 96070, the average last spring frost (32°F) is February 8, based on NOAA 1991-2020 climate normals for the Shasta Dam, CA weather station. There is a 1-in-10 chance of a frost after March 28.

When is the first frost in Obrien, CA?

The average first fall frost (32°F) is December 28. There is a 1-in-10 chance of frost by December 1, so tender plants are at risk from that point on.

How long is the growing season in 96070?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 322 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 96070Obrien, CA

The average last spring frost in Obrien is February 8 and the average first fall frost is December 28, giving a typical growing season of about 322 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 8
Average first fall frost: Dec 28
Growing season: 322 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 6 · Mar 19 · Apr 16	Nov 16 · Dec 6 · Dec 30	263 days	100%
Frost / freeze (32°F)	Dec 26 · Feb 8 · Mar 28	Dec 1 · Dec 28 · Feb 18	322 days	87%
Hard freeze (28°F)	Dec 14 · Jan 18 · Mar 14	Dec 10 · Jan 4 · Mar 10	365 days	27%

Where these dates come from

ZIP code 96070 is matched to the NOAA station Shasta Dam, CA, 18.8 km away, at 1,075 ft elevation (25 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Shasta Dam, CA (used)	1,075 ft	Feb 8	Dec 28
Redding Muni Ap, CA	497 ft	Mar 3	Nov 21
Whiskeytown Rsvr, CA	1,295 ft	Feb 13	Dec 13
Redding 12 Wnw, CA	1,418 ft	Mar 19	Nov 22

Frost dates near Obrien

Redding, CA 96049 · last Feb 8, first Dec 28
Bella Vista, CA 96008 · last Feb 8, first Dec 28
Shasta Lake, CA 96079 · last Feb 8, first Dec 28
Oak Run, CA 96069 · last Feb 8, first Dec 28
Palo Cedro, CA 96073 · last Mar 3, first Nov 21
Millville, CA 96062 · last Mar 3, first Nov 21
Round Mountain, CA 96084 · last Apr 23, first Oct 27
Lakehead, CA 96051 · last Apr 23, first Oct 27

Frequently asked questions

When is the last frost in Obrien, CA?: For ZIP code 96070, the average last spring frost (32°F) is February 8, based on NOAA 1991-2020 climate normals for the Shasta Dam, CA weather station. There is a 1-in-10 chance of a frost after March 28.
When is the first frost in Obrien, CA?: The average first fall frost (32°F) is December 28. There is a 1-in-10 chance of frost by December 1, so tender plants are at risk from that point on.
How long is the growing season in 96070?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 322 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.