Savoy, IL 61874 Frost Dates
61874, near Savoy, IL: the frost window
The last spring frost here typically falls around 04/15, about 230 days from today. Fall's first freeze usually shows up around 10/24, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Savoy in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Savoy's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Savoy against the rest of the dataset
At roughly 190 frost-free days, Savoy places 21,108 of 40,283 ZIP codes in this dataset. Within IL, it ranks 505 of 1,548.
Learn more
Two guides worth reading on 61874: zone vs. frost date, on why Zone 6a and Savoy's frost date answer different questions, and the frost range, on how to read the range around Savoy's dates instead of trusting one.