wisconsin frost dates, county by county.

Adams County

Last spring: 04-29 · First fall: 10-13

Ashland County

Last spring: 05-05 · First fall: 10-12

Barron County

Last spring: 04-28 · First fall: 10-11

Bayfield County

Last spring: 05-08 · First fall: 10-09

Brown County

Last spring: 04-17 · First fall: 10-24

Buffalo County

Last spring: 04-17 · First fall: 10-26

Burnett County

Last spring: 04-30 · First fall: 10-09

Calumet County

Last spring: 04-22 · First fall: 10-27

Chippewa County

Last spring: 04-21 · First fall: 10-20

Clark County

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

Columbia County

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

Crawford County

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

Dane County

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

Dodge County

Last spring: 04-20 · First fall: 10-21

Door County

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

Douglas County

Last spring: 04-30 · First fall: 10-13

Dunn County

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

Eau Claire County

Last spring: 04-26 · First fall: 10-11

Florence County

Last spring: 05-11 · First fall: 10-06

Fond du Lac County

Last spring: 04-21 · First fall: 10-23

Forest County

Last spring: 05-06 · First fall: 10-09

Grant County

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

Green County

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

Green Lake County

Last spring: 04-28 · First fall: 10-12

Iowa County

Last spring: 04-22 · First fall: 10-18

Iron County

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

Jackson County

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

Jefferson County

Last spring: 04-15 · First fall: 10-29

Juneau County

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

Kenosha County

Last spring: 04-15 · First fall: 10-30

Kewaunee County

Last spring: 04-23 · First fall: 11-01

La Crosse County

Last spring: 04-16 · First fall: 10-25

Lafayette County

Last spring: 04-23 · First fall: 10-16

Langlade County

Last spring: 05-01 · First fall: 10-11

Lincoln County

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

Manitowoc County

Last spring: 04-14 · First fall: 11-01

Marathon County

Last spring: 04-26 · First fall: 10-16

Marinette County

Last spring: 05-14 · First fall: 10-03

Marquette County

Last spring: 04-23 · First fall: 10-16

Menominee County

Last spring: 05-02 · First fall: 10-13

Milwaukee County

Last spring: 04-09 · First fall: 11-05

Monroe County

Last spring: 04-29 · First fall: 10-11

Oconto County

Last spring: 05-02 · First fall: 10-13

Oneida County

Last spring: 05-13 · First fall: 10-02

Outagamie County

Last spring: 04-23 · First fall: 10-18

Ozaukee County

Last spring: 04-22 · First fall: 10-25

Pepin County

Last spring: 04-20 · First fall: 10-22

Pierce County

Last spring: 05-02 · First fall: 10-08

Polk County

Last spring: 04-27 · First fall: 10-16

Portage County

Last spring: 04-25 · First fall: 10-19

Price County

Last spring: 05-09 · First fall: 10-03

Racine County

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

Richland County

Last spring: 04-25 · First fall: 10-17

Rock County

Last spring: 04-15 · First fall: 10-26

Rusk County

Last spring: 05-15 · First fall: 10-01

Sauk County

Last spring: 04-13 · First fall: 10-31

Sawyer County

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

Shawano County

Last spring: 04-30 · First fall: 10-13

Sheboygan County

Last spring: 04-13 · First fall: 11-01

St. Croix County

Last spring: 04-26 · First fall: 10-12

Taylor County

Last spring: 05-01 · First fall: 10-11

Trempealeau County

Last spring: 04-30 · First fall: 10-08

Vernon County

Last spring: 04-27 · First fall: 10-13

Vilas County

Last spring: 05-08 · First fall: 10-12

Walworth County

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

Washburn County

Last spring: 05-02 · First fall: 10-07

Washington County

Last spring: 04-22 · First fall: 10-24

Waukesha County

Last spring: 04-19 · First fall: 10-23

Waupaca County

Last spring: 04-28 · First fall: 10-17

Waushara County

Last spring: 04-30 · First fall: 10-14

Winnebago County

Last spring: 04-13 · First fall: 10-31

Wood County

Last spring: 04-29 · First fall: 10-12