Brownstown, IL 62418 Frost Dates
62418, near Brownstown, IL: the frost window
Around 04/03 is the usual last spring frost, about 218 days away. Fall's first freeze usually shows up around 10/24, roughly 202 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Brownstown in Zone 6b (-5 to 0°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
Brownstown'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.
How much risk comes with planting early here
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
Brownstown against the rest of the dataset
About 202 days separate Brownstown's last and first frost, putting it 17,320 of 40,283 ZIP codes nationally. Within IL, it ranks 181 of 1,548.
Learn more
Two guides worth reading on 62418: local microclimates, on what one yard in Brownstown can differ from the 62418 normal, and zone vs. frost date, on why Zone 6b and Brownstown's frost date answer different questions.