Hampshire, IL 60140 Frost Dates
Hampshire, IL: when does the frost end?
Around 04/25 is the usual last spring frost, about 240 days away. Fall's first freeze usually shows up around 10/22, roughly 179 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hampshire in Zone 5b (-15 to -10°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 Hampshire'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
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Hampshire against the rest of the dataset
About 179 days separate Hampshire's last and first frost, putting it 25,251 of 40,283 ZIP codes nationally. Within IL, it ranks 1,016 of 1,548.
Learn more
Before leaning on 60140's figures: the frost range explains how to read the range around Hampshire's dates instead of trusting one, while local microclimates explains what one yard in Hampshire can differ from the 60140 normal.