New Boston, IL 61272 Frost Dates
New Boston, 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 10/24, roughly 190 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts New Boston 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 New Boston'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 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/02 and only about 1 year in 10 sees frost after that.
New Boston against the rest of the dataset
New Boston's growing season runs about 190 days, ranking 21,266 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 532 of 1,548.
Learn more
Before leaning on 61272's figures: zone vs. frost date explains why Zone 5b and New Boston's frost date answer different questions, while the frost range explains how to read the range around New Boston's dates instead of trusting one.