Glenwood, IL 60425 Frost Dates
Glenwood, IL: when does the frost end?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/20, roughly 179 days after the last spring frost.
Zone 6a (-10 to -5°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 Glenwood, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Glenwood's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/23 isn't a guarantee
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.
Glenwood against the rest of the dataset
Glenwood's growing season runs about 179 days, ranking 25,254 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,017 of 1,548.
Learn more
Before leaning on 60425's figures: local microclimates explains what one yard in Glenwood can differ from the 60425 normal, while zone vs. frost date explains why Zone 6a and Glenwood's frost date answer different questions.