Towanda, IL 61791 Frost Dates
61791, near Towanda, IL: the frost window
The last spring frost here typically falls around 04/25, about 240 days from today. Fall's first freeze usually shows up around 10/16, roughly 172 days after the last spring frost.
Towanda sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Towanda's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Towanda against the rest of the dataset
At roughly 172 frost-free days, Towanda places 28,465 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,358 of 1,548.
Learn more
Two guides worth reading on 61791: the frost range, on how to read the range around Towanda's dates instead of trusting one, and local microclimates, on what one yard in Towanda can differ from the 61791 normal.