How the Old Farmer's Almanac Calculates Frost DatesThe Old Farmer's Almanac, using historical weather patterns and data from NOAA, has released its estimated first frost dates for 2026. The exact timing depends on where you live, and even communities just a few miles apart can see different first frost dates. Estimated First Frost Dates in IndianaEvansville — November 4Newburgh — October 30Mount Vernon — October 21Boonville — October 21Jasper — October 18Indianapolis — October 16Estimated First Frost Dates in KentuckyHenderson — October 20Owensboro — October 27Lexington — October 23Louisville — November 5Estimated First Frost Dates in IllinoisCarmi — October 12Carbondale — October 18Harrisburg — October 21Chicago — November 1Get our free mobile appIf you don't see your hometown on the list, don't worry. The Old Farmer's Almanac has an easy-to-use frost date calculator that lets you search by city, state, or ZIP code to find the estimated first frost date for your area. Identifying Fall Leaves One of the best parts of fall is watching the leaves change as yellows, reds, oranges, and browns blend together like nature’s own painting.