Bield:Farm
Frost dates · Illinois

Illinois frost dates,
county by county.

Last spring frost and first fall frost probability data for all 102 counties in Illinois, computed from the NOAA 1991–2020 Climate Normals. Every county page surfaces the full probability table at three temperature thresholds plus crop-specific planting guidance.

Variation across Illinois

32 days separate the earliest and latest counties.

The median last spring frost in Wabash County is March 22 — 32 days earlier than Carroll County at April 23. Statewide averages aren't useful planting tools; pick your county below for the data that actually applies to your fields.

By geography

Illinois counties on the map.

Each dot is a county. Click for full frost-date detail. Color shows last-spring-frost timing — sage = earliest, amber = latest.

ListMap
Ford County · Spring Apr 13 · Fall Oct 24 · 194-day seasonSaline County · Spring Mar 26 · Fall Nov 6 · 225-day seasonHamilton County · Spring Apr 1 · Fall Oct 30 · 212-day seasonWinnebago County · Spring Apr 13 · Fall Oct 28 · 198-day seasonDeKalb County · Spring Apr 13 · Fall Oct 28 · 198-day seasonMarshall County · Spring Apr 7 · Fall Oct 28 · 204-day seasonPiatt County · Spring Apr 11 · Fall Oct 23 · 195-day seasonRichland County · Spring Apr 3 · Fall Nov 1 · 212-day seasonLogan County · Spring Apr 7 · Fall Oct 26 · 202-day seasonFayette County · Spring Mar 27 · Fall Nov 4 · 222-day seasonEffingham County · Spring Apr 2 · Fall Nov 1 · 213-day seasonKendall County · Spring Apr 18 · Fall Oct 23 · 188-day seasonKnox County · Spring Apr 9 · Fall Oct 29 · 203-day seasonLaSalle County · Spring Apr 8 · Fall Nov 1 · 207-day seasonTazewell County · Spring Apr 5 · Fall Nov 2 · 211-day seasonChristian County · Spring Apr 1 · Fall Oct 31 · 213-day seasonScott County · Spring Apr 5 · Fall Oct 29 · 207-day seasonGrundy County · Spring Apr 8 · Fall Nov 1 · 207-day seasonJefferson County · Spring Apr 1 · Fall Nov 1 · 214-day seasonPutnam County · Spring Apr 6 · Fall Nov 1 · 209-day seasonMarion County · Spring Mar 30 · Fall Nov 3 · 218-day seasonHenry County · Spring Apr 9 · Fall Oct 30 · 204-day seasonMacoupin County · Spring Apr 2 · Fall Nov 1 · 213-day seasonDe Witt County · Spring Apr 7 · Fall Oct 26 · 202-day seasonMcDonough County · Spring Apr 7 · Fall Oct 30 · 206-day seasonWayne County · Spring Mar 27 · Fall Nov 6 · 224-day seasonSt. Clair County · Spring Mar 31 · Fall Oct 30 · 213-day seasonJasper County · Spring Apr 1 · Fall Nov 1 · 214-day seasonCumberland County · Spring Apr 3 · Fall Oct 31 · 211-day seasonBond County · Spring Mar 28 · Fall Nov 8 · 225-day seasonEdgar County · Spring Apr 9 · Fall Oct 30 · 204-day seasonOgle County · Spring Apr 19 · Fall Oct 19 · 183-day seasonJo Daviess County · Spring Apr 20 · Fall Oct 19 · 182-day seasonFulton County · Spring Apr 5 · Fall Oct 29 · 207-day seasonBureau County · Spring Apr 12 · Fall Oct 27 · 198-day seasonStephenson County · Spring Apr 14 · Fall Oct 24 · 193-day seasonPike County · Spring Apr 4 · Fall Nov 1 · 211-day seasonMason County · Spring Apr 5 · Fall Oct 29 · 207-day seasonLawrence County · Spring Apr 1 · Fall Nov 3 · 216-day seasonMcHenry County · Spring Apr 12 · Fall Nov 1 · 203-day seasonKane County · Spring Apr 14 · Fall Oct 29 · 198-day seasonDouglas County · Spring Apr 3 · Fall Oct 31 · 211-day seasonJersey County · Spring Apr 4 · Fall Oct 30 · 209-day seasonCass County · Spring Apr 7 · Fall Oct 27 · 203-day seasonMassac County · Spring Mar 27 · Fall Nov 5 · 223-day seasonMorgan County · Spring Apr 7 · Fall Oct 27 · 203-day seasonMercer County · Spring Apr 11 · Fall Oct 29 · 201-day seasonSchuyler County · Spring Apr 4 · Fall Nov 1 · 211-day seasonWabash County · Spring Mar 22 · Fall Nov 11 · 234-day seasonFranklin County · Spring Mar 25 · Fall Nov 7 · 227-day seasonGallatin County · Spring Mar 24 · Fall Nov 8 · 229-day seasonGreene County · Spring Apr 2 · Fall Nov 1 · 213-day seasonEdwards County · Spring Mar 25 · Fall Nov 6 · 226-day seasonWarren County · Spring Apr 11 · Fall Oct 25 · 197-day seasonBrown County · Spring Apr 6 · Fall Oct 27 · 204-day seasonMontgomery County · Spring Apr 2 · Fall Nov 2 · 214-day seasonMadison County · Spring Mar 25 · Fall Nov 16 · 236-day seasonUnion County · Spring Mar 29 · Fall Nov 8 · 224-day seasonPope County · Spring Apr 2 · Fall Oct 31 · 212-day seasonClark County · Spring Apr 3 · Fall Oct 31 · 211-day seasonLee County · Spring Apr 16 · Fall Oct 24 · 191-day seasonShelby County · Spring Mar 31 · Fall Nov 3 · 217-day seasonCook County · Spring Apr 1 · Fall Nov 15 · 228-day seasonKankakee County · Spring Apr 6 · Fall Nov 4 · 212-day seasonPulaski County · Spring Mar 22 · Fall Nov 17 · 240-day seasonClay County · Spring Mar 31 · Fall Nov 3 · 217-day seasonVermilion County · Spring Apr 8 · Fall Oct 31 · 206-day seasonMenard County · Spring Apr 3 · Fall Nov 1 · 212-day seasonMonroe County · Spring Mar 31 · Fall Nov 5 · 219-day seasonRock Island County · Spring Apr 12 · Fall Oct 27 · 198-day seasonWilliamson County · Spring Mar 29 · Fall Nov 1 · 217-day seasonWoodford County · Spring Apr 9 · Fall Oct 27 · 201-day seasonHardin County · Spring Apr 6 · Fall Oct 29 · 206-day seasonAdams County · Spring Apr 4 · Fall Nov 1 · 211-day seasonIroquois County · Spring Apr 12 · Fall Oct 26 · 197-day seasonLivingston County · Spring Apr 4 · Fall Nov 3 · 213-day seasonHenderson County · Spring Mar 31 · Fall Nov 7 · 221-day seasonBoone County · Spring Apr 18 · Fall Oct 25 · 190-day seasonAlexander County · Spring Mar 26 · Fall Nov 4 · 223-day seasonCarroll County · Spring Apr 23 · Fall Oct 16 · 176-day seasonWill County · Spring Apr 5 · Fall Nov 4 · 213-day seasonStark County · Spring Apr 13 · Fall Oct 28 · 198-day seasonRandolph County · Spring Apr 1 · Fall Nov 1 · 214-day seasonLake County · Spring Apr 13 · Fall Nov 1 · 202-day seasonMacon County · Spring Apr 3 · Fall Nov 3 · 214-day seasonWashington County · Spring Mar 30 · Fall Nov 4 · 219-day seasonCrawford County · Spring Apr 2 · Fall Oct 31 · 212-day seasonCalhoun County · Spring Apr 6 · Fall Oct 29 · 206-day seasonMcLean County · Spring Apr 14 · Fall Oct 27 · 196-day seasonChampaign County · Spring Apr 4 · Fall Nov 2 · 212-day seasonClinton County · Spring Mar 28 · Fall Nov 8 · 225-day seasonHancock County · Spring Apr 3 · Fall Nov 1 · 212-day seasonWhiteside County · Spring Apr 15 · Fall Oct 23 · 191-day seasonWhite County · Spring Apr 3 · Fall Oct 28 · 208-day seasonSangamon County · Spring Apr 5 · Fall Nov 1 · 210-day seasonMoultrie County · Spring Apr 4 · Fall Nov 1 · 211-day seasonJohnson County · Spring Apr 2 · Fall Oct 31 · 212-day seasonPeoria County · Spring Apr 5 · Fall Nov 2 · 211-day seasonJackson County · Spring Mar 30 · Fall Nov 1 · 216-day seasonColes County · Spring Apr 3 · Fall Nov 2 · 213-day seasonPerry County · Spring Mar 27 · Fall Nov 2 · 220-day seasonDuPage County · Spring Apr 16 · Fall Oct 26 · 193-day season
Last spring frostEarliestMedianLatest
102 counties · click any county for full frost data
Alphabetical

All Illinois counties — A to Z.

Frost dates set the calendar. Bield: Farm runs it.

Pair these dates with live forecasts for your specific farm location. Bield: Farm logs your soil tests, planting dates, weather, and yield outcomes year over year.

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