idaho frost dates, county by county.

Ada County

Last spring: 04-02 · First fall: 10-31

Adams County

Last spring: 04-22 · First fall: 10-16

Bannock County

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

Bear Lake County

Last spring: 05-25 · First fall: 09-16

Benewah County

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

Bingham County

Last spring: 04-22 · First fall: 10-16

Blaine County

Last spring: 06-02 · First fall: 09-23

Boise County

Last spring: 05-15 · First fall: 09-23

Bonner County

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

Bonneville County

Last spring: 05-19 · First fall: 09-23

Boundary County

Last spring: 04-10 · First fall: 10-16

Butte County

Last spring: 05-06 · First fall: 10-03

Camas County

Last spring: 05-11 · First fall: 09-28

Canyon County

Last spring: 04-05 · First fall: 10-30

Caribou County

Last spring: 05-27 · First fall: 09-12

Cassia County

Last spring: 05-17 · First fall: 09-26

Clark County

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

Clearwater County

Last spring: 05-17 · First fall: 09-20

Custer County

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

Elmore County

Last spring: 05-30 · First fall: 09-18

Franklin County

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

Fremont County

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

Gem County

Last spring: 05-07 · First fall: 09-29

Gooding County

Last spring: 04-19 · First fall: 10-15

Idaho County

Last spring: 05-22 · First fall: 09-07

Jefferson County

Last spring: 05-14 · First fall: 09-21

Jerome County

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

Kootenai County

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

Latah County

Last spring: 04-28 · First fall: 10-05

Lemhi County

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

Lewis County

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

Lincoln County

Last spring: 05-08 · First fall: 10-07

Madison County

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

Minidoka County

Last spring: 05-02 · First fall: 10-15

Nez Perce County

Last spring: 05-02 · First fall: 10-09

Oneida County

Last spring: 05-04 · First fall: 10-02

Owyhee County

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

Payette County

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

Power County

Last spring: 04-19 · First fall: 10-21

Shoshone County

Last spring: 04-24 · First fall: 10-14

Teton County

Last spring: 05-22 · First fall: 09-20

Twin Falls County

Last spring: 04-25 · First fall: 10-15

Valley County

Last spring: 05-16 · First fall: 09-24

Washington County

Last spring: 04-28 · First fall: 10-07