Shabbona, IL 60550 Frost Dates
60550, near Shabbona, IL: the frost window
Typically, the last spring freeze lands around 04/28, roughly 243 days out. Fall's first freeze usually shows up around 10/10, roughly 163 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Shabbona 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
Shabbona's growing season runs out in roughly 6 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
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Shabbona against the rest of the dataset
About 163 days separate Shabbona's last and first frost, putting it 31,484 of 40,283 ZIP codes nationally. Within IL, it ranks 1,527 of 1,548.
Learn more
Two guides worth reading on 60550: local microclimates, on what one yard in Shabbona can differ from the 60550 normal, and zone vs. frost date, on why Zone 5b and Shabbona's frost date answer different questions.