Karnak, IL 62956 Frost Dates
Karnak, IL: when does the frost end?
Around 04/03 is the usual last spring frost, about 218 days away. Fall's first freeze usually shows up around 10/27, roughly 205 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Karnak 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 9 weeks until Karnak's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Karnak against the rest of the dataset
Karnak's growing season runs about 205 days, ranking 16,392 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 118 of 1,548.
Learn more
Before leaning on 62956's figures: the frost range explains how to read the range around Karnak's dates instead of trusting one, while local microclimates explains what one yard in Karnak can differ from the 62956 normal.