Mendon, IL 62351 Frost Dates
Mendon, IL: when does the frost end?
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/23, roughly 191 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Mendon, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Mendon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/01 and only about 1 year in 10 sees frost after that.
Mendon against the rest of the dataset
Mendon's growing season runs about 191 days, ranking 20,845 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 456 of 1,548.
Learn more
Before leaning on 62351's figures: the frost range explains how to read the range around Mendon's dates instead of trusting one, while local microclimates explains what one yard in Mendon can differ from the 62351 normal.