San Jose, IL 62682 Frost Dates
62682, near San Jose, IL: the frost window
Around 04/17 is the usual last spring frost, about 232 days away. Fall's first freeze usually shows up around 10/18, roughly 182 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts San Jose in Zone 6a (-10 to -5°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
San Jose's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around San Jose's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/04 and only about 1 year in 10 sees frost after that.
San Jose against the rest of the dataset
At roughly 182 frost-free days, San Jose places 24,291 of 40,283 ZIP codes in this dataset. Within IL, it ranks 909 of 1,548.
Learn more
Two guides worth reading on 62682: zone vs. frost date, on why Zone 6a and San Jose's frost date answer different questions, and the frost range, on how to read the range around San Jose's dates instead of trusting one.