Belknap, IL 62908 Frost Dates
Belknap, IL: when does the frost end?
Around 04/14 is the usual last spring frost, about 229 days away. Fall's first freeze usually shows up around 10/21, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Belknap in Zone 7a (0 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
With roughly 8 weeks until Belknap'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 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Belknap against the rest of the dataset
Belknap's growing season runs about 189 days, ranking 21,772 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 659 of 1,548.
Learn more
Before leaning on 62908's figures: zone vs. frost date explains why Zone 7a and Belknap's frost date answer different questions, while the frost range explains how to read the range around Belknap's dates instead of trusting one.