california frost dates, county by county.

Alameda County

Last spring: 01-10 · First fall: 12-18

Alpine County

Last spring: 04-24 · First fall: 10-18

Amador County

Last spring: 01-10 · First fall: 12-27

Butte County

Last spring: 01-05 · First fall: 12-31

Calaveras County

Last spring: 01-06 · First fall: 12-24

Colusa County

Last spring: 01-08 · First fall: 12-15

Contra Costa County

Last spring: 02-08 · First fall: 01-16

Del Norte County

Last spring: 01-17 · First fall: 12-17

El Dorado County

Last spring: 04-06 · First fall: 11-22

Fresno County

Last spring: 01-04 · First fall: 12-24

Glenn County

Last spring: 03-01 · First fall: 11-29

Humboldt County

Last spring: 01-03 · First fall: 12-25

Imperial County

Last spring: 01-02 · First fall: 12-29

Inyo County

Last spring: 12-31 · First fall: 12-28

Kern County

Last spring: 03-28 · First fall: 12-01

Kings County

Last spring: 01-24 · First fall: 12-12

Lake County

Last spring: 03-14 · First fall: 11-21

Lassen County

Last spring: 04-26 · First fall: 10-21

Los Angeles County

Last spring: — · First fall: —

Madera County

Last spring: 04-05 · First fall: 11-20

Marin County

Last spring: 12-31 · First fall: 12-29

Mariposa County

Last spring: 04-26 · First fall: 11-13

Mendocino County

Last spring: 03-31 · First fall: 10-30

Merced County

Last spring: 02-12 · First fall: 11-29

Modoc County

Last spring: 05-11 · First fall: 09-25

Mono County

Last spring: 05-02 · First fall: 10-21

Monterey County

Last spring: 01-22 · First fall: 12-06

Napa County

Last spring: 02-18 · First fall: 12-30

Nevada County

Last spring: 04-16 · First fall: 11-23

Orange County

Last spring: — · First fall: —

Placer County

Last spring: 03-13 · First fall: 12-08

Plumas County

Last spring: 04-29 · First fall: 10-09

Riverside County

Last spring: 01-15 · First fall: 12-13

Sacramento County

Last spring: 12-31 · First fall: 12-25

San Benito County

Last spring: 03-12 · First fall: 11-22

San Bernardino County

Last spring: 01-30 · First fall: 12-08

San Diego County

Last spring: 01-31 · First fall: 12-19

San Francisco County

Last spring: — · First fall: —

San Joaquin County

Last spring: 01-10 · First fall: 12-16

San Luis Obispo County

Last spring: 01-09 · First fall: 01-06

San Mateo County

Last spring: 01-05 · First fall: 12-31

Santa Barbara County

Last spring: 02-27 · First fall: 11-27

Santa Clara County

Last spring: 04-10 · First fall: 12-07

Santa Cruz County

Last spring: 01-03 · First fall: 12-27

Shasta County

Last spring: 01-18 · First fall: 01-04

Sierra County

Last spring: 04-23 · First fall: 11-13

Siskiyou County

Last spring: 04-12 · First fall: 11-01

Solano County

Last spring: 12-31 · First fall: 12-24

Sonoma County

Last spring: 01-23 · First fall: 12-05

Stanislaus County

Last spring: 01-08 · First fall: 12-21

Sutter County

Last spring: 01-12 · First fall: 12-13

Tehama County

Last spring: 01-13 · First fall: 12-15

Trinity County

Last spring: 03-17 · First fall: 11-19

Tulare County

Last spring: 01-20 · First fall: 12-14

Tuolumne County

Last spring: 04-16 · First fall: 11-20

Ventura County

Last spring: 02-17 · First fall: 12-01

Yolo County

Last spring: 01-10 · First fall: 12-18

Yuba County

Last spring: 02-27 · First fall: 12-01