Pontoosuc, IL 52658 Frost Dates
Pontoosuc, IL: when does the frost end?
Typically, the last spring freeze lands around 04/18, roughly 233 days out. Fall's first freeze usually shows up around 10/20, roughly 185 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Pontoosuc in Zone 6a (-10 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 Pontoosuc's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Pontoosuc's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Pontoosuc against the rest of the dataset
At roughly 185 frost-free days, Pontoosuc places 23,357 of 40,283 ZIP codes in this dataset. Within IL, it ranks 857 of 1,548.
Learn more
Before leaning on 52658's figures: the frost range explains how to read the range around Pontoosuc's dates instead of trusting one, while local microclimates explains what one yard in Pontoosuc can differ from the 52658 normal.