Frost Dates
Last spring freeze · first fall freeze · frost-free season, from NOAA 1991–2020 climate normals

Frost dates in Illinois

9 cities · typical last spring freeze → typical first fall freeze (32°F, median of 1991–2020 normals)

ChicagoApril 10 → November 5AuroraApril 19 → October 23NapervilleApril 28 → October 16JolietApril 19 → October 25RockfordApril 24 → October 17ElginApril 26 → October 18SpringfieldApril 15 → October 22PeoriaApril 16 → October 23ChampaignApril 15 → October 24