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 frost timing

Counties sorted by last spring frost.

Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.

List Map

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.

Download Bield: Farm

Illinois frost dates,county by county.

32 days separate the earliest and latest counties.

Counties sorted by last spring frost.

All Illinois counties — A to Z.

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

Illinois frost dates,
county by county.