Frost dates · Illinois
Illinois counties by frost timing.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
Sorted by spring frost
Latest → earliest.
Carroll County
Spring Apr 23·Fall Oct 16176-day season
Jo Daviess County
Spring Apr 20·Fall Oct 19182-day season
Ogle County
Spring Apr 19·Fall Oct 19183-day season
Boone County
Spring Apr 18·Fall Oct 25190-day season
Kendall County
Spring Apr 18·Fall Oct 23188-day season
DuPage County
Spring Apr 16·Fall Oct 26193-day season
Lee County
Spring Apr 16·Fall Oct 24191-day season
Whiteside County
Spring Apr 15·Fall Oct 23191-day season
Kane County
Spring Apr 14·Fall Oct 29198-day season
McLean County
Spring Apr 14·Fall Oct 27196-day season
Stephenson County
Spring Apr 14·Fall Oct 24193-day season
DeKalb County
Spring Apr 13·Fall Oct 28198-day season
Ford County
Spring Apr 13·Fall Oct 24194-day season
Lake County
Spring Apr 13·Fall Nov 1202-day season
Stark County
Spring Apr 13·Fall Oct 28198-day season
Winnebago County
Spring Apr 13·Fall Oct 28198-day season
Bureau County
Spring Apr 12·Fall Oct 27198-day season
Iroquois County
Spring Apr 12·Fall Oct 26197-day season
McHenry County
Spring Apr 12·Fall Nov 1203-day season
Rock Island County
Spring Apr 12·Fall Oct 27198-day season
Mercer County
Spring Apr 11·Fall Oct 29201-day season
Piatt County
Spring Apr 11·Fall Oct 23195-day season
Warren County
Spring Apr 11·Fall Oct 25197-day season
Edgar County
Spring Apr 9·Fall Oct 30204-day season
Henry County
Spring Apr 9·Fall Oct 30204-day season
Knox County
Spring Apr 9·Fall Oct 29203-day season
Woodford County
Spring Apr 9·Fall Oct 27201-day season
Grundy County
Spring Apr 8·Fall Nov 1207-day season
LaSalle County
Spring Apr 8·Fall Nov 1207-day season
Vermilion County
Spring Apr 8·Fall Oct 31206-day season
Cass County
Spring Apr 7·Fall Oct 27203-day season
De Witt County
Spring Apr 7·Fall Oct 26202-day season
Logan County
Spring Apr 7·Fall Oct 26202-day season
Marshall County
Spring Apr 7·Fall Oct 28204-day season
McDonough County
Spring Apr 7·Fall Oct 30206-day season
Morgan County
Spring Apr 7·Fall Oct 27203-day season
Brown County
Spring Apr 6·Fall Oct 27204-day season
Calhoun County
Spring Apr 6·Fall Oct 29206-day season
Hardin County
Spring Apr 6·Fall Oct 29206-day season
Kankakee County
Spring Apr 6·Fall Nov 4212-day season
Putnam County
Spring Apr 6·Fall Nov 1209-day season
Fulton County
Spring Apr 5·Fall Oct 29207-day season
Mason County
Spring Apr 5·Fall Oct 29207-day season
Peoria County
Spring Apr 5·Fall Nov 2211-day season
Sangamon County
Spring Apr 5·Fall Nov 1210-day season
Scott County
Spring Apr 5·Fall Oct 29207-day season
Tazewell County
Spring Apr 5·Fall Nov 2211-day season
Will County
Spring Apr 5·Fall Nov 4213-day season
Adams County
Spring Apr 4·Fall Nov 1211-day season
Champaign County
Spring Apr 4·Fall Nov 2212-day season
Jersey County
Spring Apr 4·Fall Oct 30209-day season
Livingston County
Spring Apr 4·Fall Nov 3213-day season
Moultrie County
Spring Apr 4·Fall Nov 1211-day season
Pike County
Spring Apr 4·Fall Nov 1211-day season
Schuyler County
Spring Apr 4·Fall Nov 1211-day season
Clark County
Spring Apr 3·Fall Oct 31211-day season
Coles County
Spring Apr 3·Fall Nov 2213-day season
Cumberland County
Spring Apr 3·Fall Oct 31211-day season
Douglas County
Spring Apr 3·Fall Oct 31211-day season
Hancock County
Spring Apr 3·Fall Nov 1212-day season
Macon County
Spring Apr 3·Fall Nov 3214-day season
Menard County
Spring Apr 3·Fall Nov 1212-day season
Richland County
Spring Apr 3·Fall Nov 1212-day season
White County
Spring Apr 3·Fall Oct 28208-day season
Crawford County
Spring Apr 2·Fall Oct 31212-day season
Effingham County
Spring Apr 2·Fall Nov 1213-day season
Greene County
Spring Apr 2·Fall Nov 1213-day season
Johnson County
Spring Apr 2·Fall Oct 31212-day season
Macoupin County
Spring Apr 2·Fall Nov 1213-day season
Montgomery County
Spring Apr 2·Fall Nov 2214-day season
Pope County
Spring Apr 2·Fall Oct 31212-day season
Christian County
Spring Apr 1·Fall Oct 31213-day season
Cook County
Spring Apr 1·Fall Nov 15228-day season
Hamilton County
Spring Apr 1·Fall Oct 30212-day season
Jasper County
Spring Apr 1·Fall Nov 1214-day season
Jefferson County
Spring Apr 1·Fall Nov 1214-day season
Lawrence County
Spring Apr 1·Fall Nov 3216-day season
Randolph County
Spring Apr 1·Fall Nov 1214-day season
Clay County
Spring Mar 31·Fall Nov 3217-day season
Henderson County
Spring Mar 31·Fall Nov 7221-day season
Monroe County
Spring Mar 31·Fall Nov 5219-day season
Shelby County
Spring Mar 31·Fall Nov 3217-day season
St. Clair County
Spring Mar 31·Fall Oct 30213-day season
Jackson County
Spring Mar 30·Fall Nov 1216-day season
Marion County
Spring Mar 30·Fall Nov 3218-day season
Washington County
Spring Mar 30·Fall Nov 4219-day season
Union County
Spring Mar 29·Fall Nov 8224-day season
Williamson County
Spring Mar 29·Fall Nov 1217-day season
Bond County
Spring Mar 28·Fall Nov 8225-day season
Clinton County
Spring Mar 28·Fall Nov 8225-day season
Fayette County
Spring Mar 27·Fall Nov 4222-day season
Massac County
Spring Mar 27·Fall Nov 5223-day season
Perry County
Spring Mar 27·Fall Nov 2220-day season
Wayne County
Spring Mar 27·Fall Nov 6224-day season
Alexander County
Spring Mar 26·Fall Nov 4223-day season
Saline County
Spring Mar 26·Fall Nov 6225-day season
Edwards County
Spring Mar 25·Fall Nov 6226-day season
Franklin County
Spring Mar 25·Fall Nov 7227-day season
Madison County
Spring Mar 25·Fall Nov 16236-day season
Gallatin County
Spring Mar 24·Fall Nov 8229-day season
Pulaski County
Spring Mar 22·Fall Nov 17240-day season
Wabash County
Spring Mar 22·Fall Nov 11234-day season
Alphabetical · A to Z
- Adams County
- Alexander County
- Bond County
- Boone County
- Brown County
- Bureau County
- Calhoun County
- Carroll County
- Cass County
- Champaign County
- Christian County
- Clark County
- Clay County
- Clinton County
- Coles County
- Cook County
- Crawford County
- Cumberland County
- De Witt County
- DeKalb County
- Douglas County
- DuPage County
- Edgar County
- Edwards County
- Effingham County
- Fayette County
- Ford County
- Franklin County
- Fulton County
- Gallatin County
- Greene County
- Grundy County
- Hamilton County
- Hancock County
- Hardin County
- Henderson County
- Henry County
- Iroquois County
- Jackson County
- Jasper County
- Jefferson County
- Jersey County
- Jo Daviess County
- Johnson County
- Kane County
- Kankakee County
- Kendall County
- Knox County
- Lake County
- LaSalle County
- Lawrence County
- Lee County
- Livingston County
- Logan County
- Macon County
- Macoupin County
- Madison County
- Marion County
- Marshall County
- Mason County
- Massac County
- McDonough County
- McHenry County
- McLean County
- Menard County
- Mercer County
- Monroe County
- Montgomery County
- Morgan County
- Moultrie County
- Ogle County
- Peoria County
- Perry County
- Piatt County
- Pike County
- Pope County
- Pulaski County
- Putnam County
- Randolph County
- Richland County
- Rock Island County
- Saline County
- Sangamon County
- Schuyler County
- Scott County
- Shelby County
- St. Clair County
- Stark County
- Stephenson County
- Tazewell County
- Union County
- Vermilion County
- Wabash County
- Warren County
- Washington County
- Wayne County
- White County
- Whiteside County
- Will County
- Williamson County
- Winnebago County
- Woodford County