Brookport, IL 62910 Frost Dates
62910, near Brookport, IL: the frost window
Around 04/06 is the usual last spring frost, about 221 days away. Fall's first freeze usually shows up around 10/27, roughly 203 days after the last spring frost.
Zone 7a (0 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 Brookport, not a forecast for this year.
Stretching the season past the first frost
Brookport's growing season runs out in roughly 9 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
04/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
Brookport against the rest of the dataset
Brookport's growing season runs about 203 days, ranking 17,008 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 170 of 1,548.
Learn more
Two guides worth reading on 62910: zone vs. frost date, on why Zone 7a and Brookport's frost date answer different questions, and the frost range, on how to read the range around Brookport's dates instead of trusting one.