illinois frost dates, county by county.

Adams County

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

Alexander County

Last spring: 03-26 · First fall: 11-04

Bond County

Last spring: 03-28 · First fall: 11-08

Boone County

Last spring: 04-18 · First fall: 10-25

Brown County

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

Bureau County

Last spring: 04-12 · First fall: 10-27

Calhoun County

Last spring: 04-06 · First fall: 10-29

Carroll County

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

Cass County

Last spring: 04-07 · First fall: 10-27

Champaign County

Last spring: 04-04 · First fall: 11-02

Christian County

Last spring: 04-01 · First fall: 10-31

Clark County

Last spring: 04-03 · First fall: 10-31

Clay County

Last spring: 03-31 · First fall: 11-03

Clinton County

Last spring: 03-28 · First fall: 11-08

Coles County

Last spring: 04-03 · First fall: 11-02

Cook County

Last spring: 04-01 · First fall: 11-15

Crawford County

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

Cumberland County

Last spring: 04-03 · First fall: 10-31

De Witt County

Last spring: 04-07 · First fall: 10-26

DeKalb County

Last spring: 04-13 · First fall: 10-28

Douglas County

Last spring: 04-03 · First fall: 10-31

DuPage County

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

Edgar County

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

Edwards County

Last spring: 03-25 · First fall: 11-06

Effingham County

Last spring: 04-02 · First fall: 11-01

Fayette County

Last spring: 03-27 · First fall: 11-04

Ford County

Last spring: 04-13 · First fall: 10-24

Franklin County

Last spring: 03-25 · First fall: 11-07

Fulton County

Last spring: 04-05 · First fall: 10-29

Gallatin County

Last spring: 03-24 · First fall: 11-08

Greene County

Last spring: 04-02 · First fall: 11-01

Grundy County

Last spring: 04-08 · First fall: 11-01

Hamilton County

Last spring: 04-01 · First fall: 10-30

Hancock County

Last spring: 04-03 · First fall: 11-01

Hardin County

Last spring: 04-06 · First fall: 10-29

Henderson County

Last spring: 03-31 · First fall: 11-07

Henry County

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

Iroquois County

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

Jackson County

Last spring: 03-30 · First fall: 11-01

Jasper County

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

Jefferson County

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

Jersey County

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

Jo Daviess County

Last spring: 04-20 · First fall: 10-19

Johnson County

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

Kane County

Last spring: 04-14 · First fall: 10-29

Kankakee County

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

Kendall County

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

Knox County

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

Lake County

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

LaSalle County

Last spring: 04-08 · First fall: 11-01

Lawrence County

Last spring: 04-01 · First fall: 11-03

Lee County

Last spring: 04-16 · First fall: 10-24

Livingston County

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

Logan County

Last spring: 04-07 · First fall: 10-26

Macon County

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

Macoupin County

Last spring: 04-02 · First fall: 11-01

Madison County

Last spring: 03-25 · First fall: 11-16

Marion County

Last spring: 03-30 · First fall: 11-03

Marshall County

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

Mason County

Last spring: 04-05 · First fall: 10-29

Massac County

Last spring: 03-27 · First fall: 11-05

McDonough County

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

McHenry County

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

McLean County

Last spring: 04-14 · First fall: 10-27

Menard County

Last spring: 04-03 · First fall: 11-01

Mercer County

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

Monroe County

Last spring: 03-31 · First fall: 11-05

Montgomery County

Last spring: 04-02 · First fall: 11-02

Morgan County

Last spring: 04-07 · First fall: 10-27

Moultrie County

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

Ogle County

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

Peoria County

Last spring: 04-05 · First fall: 11-02

Perry County

Last spring: 03-27 · First fall: 11-02

Piatt County

Last spring: 04-11 · First fall: 10-23

Pike County

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

Pope County

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

Pulaski County

Last spring: 03-22 · First fall: 11-17

Putnam County

Last spring: 04-06 · First fall: 11-01

Randolph County

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

Richland County

Last spring: 04-03 · First fall: 11-01

Rock Island County

Last spring: 04-12 · First fall: 10-27

Saline County

Last spring: 03-26 · First fall: 11-06

Sangamon County

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

Schuyler County

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

Scott County

Last spring: 04-05 · First fall: 10-29

Shelby County

Last spring: 03-31 · First fall: 11-03

St. Clair County

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

Stark County

Last spring: 04-13 · First fall: 10-28

Stephenson County

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

Tazewell County

Last spring: 04-05 · First fall: 11-02

Union County

Last spring: 03-29 · First fall: 11-08

Vermilion County

Last spring: 04-08 · First fall: 10-31

Wabash County

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

Warren County

Last spring: 04-11 · First fall: 10-25

Washington County

Last spring: 03-30 · First fall: 11-04

Wayne County

Last spring: 03-27 · First fall: 11-06

White County

Last spring: 04-03 · First fall: 10-28

Whiteside County

Last spring: 04-15 · First fall: 10-23

Will County

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

Williamson County

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

Winnebago County

Last spring: 04-13 · First fall: 10-28

Woodford County

Last spring: 04-09 · First fall: 10-27