washington frost dates, county by county.

Adams County

Last spring: 04-23 · First fall: 10-17

Asotin County

Last spring: 03-15 · First fall: 11-08

Benton County

Last spring: 03-23 · First fall: 11-02

Chelan County

Last spring: 05-03 · First fall: 10-04

Clallam County

Last spring: 03-04 · First fall: 11-24

Clark County

Last spring: 03-29 · First fall: 11-05

Columbia County

Last spring: 04-06 · First fall: 10-25

Cowlitz County

Last spring: 03-06 · First fall: 11-24

Douglas County

Last spring: 03-29 · First fall: 11-04

Ferry County

Last spring: 05-12 · First fall: 09-24

Franklin County

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

Garfield County

Last spring: 04-11 · First fall: 10-19

Grant County

Last spring: 04-06 · First fall: 10-27

Grays Harbor County

Last spring: 02-18 · First fall: 12-06

Island County

Last spring: 02-21 · First fall: 11-28

Jefferson County

Last spring: 03-04 · First fall: 11-24

King County

Last spring: 02-27 · First fall: 11-29

Kitsap County

Last spring: 02-27 · First fall: 11-30

Kittitas County

Last spring: 04-11 · First fall: 10-20

Klickitat County

Last spring: 05-01 · First fall: 10-07

Lewis County

Last spring: 03-06 · First fall: 12-01

Lincoln County

Last spring: 05-09 · First fall: 10-01

Mason County

Last spring: 02-20 · First fall: 12-07

Okanogan County

Last spring: 04-14 · First fall: 10-19

Pacific County

Last spring: 03-27 · First fall: 11-07

Pend Oreille County

Last spring: 05-04 · First fall: 09-28

Pierce County

Last spring: 03-16 · First fall: 11-14

San Juan County

Last spring: 02-22 · First fall: 12-01

Skagit County

Last spring: 02-25 · First fall: 12-02

Skamania County

Last spring: 04-07 · First fall: 10-30

Snohomish County

Last spring: 03-18 · First fall: 11-12

Spokane County

Last spring: 04-04 · First fall: 10-27

Stevens County

Last spring: 04-30 · First fall: 09-28

Thurston County

Last spring: 04-05 · First fall: 11-01

Wahkiakum County

Last spring: 03-25 · First fall: 11-12

Walla Walla County

Last spring: 03-04 · First fall: 11-14

Whatcom County

Last spring: 03-28 · First fall: 11-17

Whitman County

Last spring: 04-05 · First fall: 10-20

Yakima County

Last spring: 03-16 · First fall: 11-03