Fisher, IL 61840 Frost Dates
Fisher, IL: when does the frost end?
Typically, the last spring freeze lands around 04/21, roughly 236 days out. Fall's first freeze usually shows up around 10/18, roughly 179 days after the last spring frost.
Fisher 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
With roughly 7 weeks until Fisher's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Fisher against the rest of the dataset
About 179 days separate Fisher's last and first frost, putting it 25,344 of 40,283 ZIP codes nationally. Within IL, it ranks 1,035 of 1,548.
Learn more
Before leaning on 61840's figures: the frost range explains how to read the range around Fisher's dates instead of trusting one, while local microclimates explains what one yard in Fisher can differ from the 61840 normal.