Forget About Colorado, Wyoming, And Montana (It's always snowing in those states), Northern Illinois' First Snowfall Of The Year Generally Happens Around The Same Time Every YearSure, even though the first snowfall in Northern Illinois does happen earlier some years than others, I couldn't find any examples of anyone having to push a snow-blower around their Rockford driveway in June or July. ), Northern Illinois gets its first snowfall of the season on October 31st ("Shovel the walk Henry, we've got trick-or-treaters!"). As for the latest date that we've received snow in this area, we'll have to go back a hundred years to 1925, when it snowed over Northern Illinois on May 24th. The earliest late date for snow in Northern Illinois happened on March 5th of 2012. Getty Images/iStockphoto Getty Images/iStockphoto loading...Now That You Know The Background, What's Your Guess For The Date Of Northern Illinois' First Snowfall Of Winter 2025?