Forreston, IL 61030 Frost Dates
Forreston, IL: when does the frost end?
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/13, roughly 169 days after the last spring frost.
Zone 5b (-15 to -10°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 Forreston, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Forreston's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Forreston against the rest of the dataset
At roughly 169 frost-free days, Forreston places 29,490 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,430 of 1,548.
Learn more
Before leaning on 61030's figures: local microclimates explains what one yard in Forreston can differ from the 61030 normal, while zone vs. frost date explains why Zone 5b and Forreston's frost date answer different questions.