New Berlin, IL 62670 Frost Dates
62670, near New Berlin, IL: the frost window
The last spring frost here typically falls around 04/14, about 229 days from today. Fall's first freeze usually shows up around 10/20, roughly 187 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 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
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 04/29 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 187 days, ranking 22,479 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 761 of 1,548.
Learn more
Two guides worth reading on 62670: 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 62670 normal.