South Holland, IL 60473 Frost Dates
60473, near South Holland, IL: the frost window
Around 04/23 is the usual last spring frost, about 238 days away. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts South Holland 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
South Holland'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
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 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.
South Holland against the rest of the dataset
At roughly 179 frost-free days, South Holland places 25,199 of 40,283 ZIP codes in this dataset. Within IL, it ranks 999 of 1,548.
Learn more
Two guides worth reading on 60473: local microclimates, on what one yard in South Holland can differ from the 60473 normal, and zone vs. frost date, on why Zone 6a and South Holland's frost date answer different questions.