Mineral, IL 61344 Frost Dates
Mineral, IL: when does the frost end?
Around 04/24 is the usual last spring frost, about 239 days away. Fall's first freeze usually shows up around 10/17, roughly 175 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mineral in Zone 5b (-15 to -10°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
With roughly 7 weeks until Mineral's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mineral's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Mineral against the rest of the dataset
Mineral's growing season runs about 175 days, ranking 27,256 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,217 of 1,548.
Learn more
Before leaning on 61344's figures: zone vs. frost date explains why Zone 5b and Mineral's frost date answer different questions, while the frost range explains how to read the range around Mineral's dates instead of trusting one.