Illinois frost dates by county and ZIP code
Across 1,396 Illinois ZIP codes the average last spring frost runs Apr 1 to May 2 and the average first fall frost Oct 7 to Nov 5 (50% odds, 32°F, NOAA 1991–2020 normals), with USDA hardiness zones. Download the table as CSV.
Counties
- Adams
- Alexander
- Bond
- Boone
- Brown
- Bureau
- Calhoun
- Carroll
- Cass
- Champaign
- Christian
- Clark
- Clay
- Clinton
- Coles
- Cook
- Crawford
- Cumberland
- De Witt
- DeKalb
- Douglas
- DuPage
- Edgar
- Edwards
- Effingham
- Fayette
- Ford
- Franklin
- Fulton
- Gallatin
- Greene
- Grundy
- Hamilton
- Hancock
- Hardin
- Henderson
- Henry
- Iroquois
- Jackson
- Jasper
- Jefferson
- Jersey
- Jo Daviess
- Johnson
- Kane
- Kankakee
- Kendall
- Knox
- LaSalle
- Lake
- Lawrence
- Lee
- Livingston
- Logan
- Macon
- Macoupin
- Madison
- Marion
- Marshall
- Mason
- Massac
- McDonough
- McHenry
- McLean
- Menard
- Mercer
- Monroe
- Montgomery
- Morgan
- Moultrie
- Ogle
- Peoria
- Perry
- Piatt
- Pike
- Pope
- Pulaski
- Putnam
- Randolph
- Richland
- Rock Island
- Saline
- Sangamon
- Schuyler
- Scott
- Shelby
- St. Clair
- Stark
- Stephenson
- Tazewell
- Union
- Vermilion
- Wabash
- Warren
- Washington
- Wayne
- White
- Whiteside
- Will
- Williamson
- Winnebago
- Woodford
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