New Berlin, IL 62601 Frost Dates
62601, near New Berlin, IL: the frost window
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/17, roughly 179 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for New Berlin, not a forecast for this year.
Stretching the season past the first frost
New Berlin's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/19 isn't a guarantee
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
New Berlin against the rest of the dataset
New Berlin's growing season runs about 179 days, ranking 25,387 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,045 of 1,548.
Learn more
Two guides worth reading on 62601: the frost range, on how to read the range around New Berlin's dates instead of trusting one, and local microclimates, on what one yard in New Berlin can differ from the 62601 normal.