Flanagan, IL 61740 Frost Dates
Flanagan, IL: when does the frost end?
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/17, roughly 173 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Flanagan 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 Flanagan's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Flanagan against the rest of the dataset
At roughly 173 frost-free days, Flanagan places 27,987 of 40,283 ZIP codes in this dataset. Within IL, it ranks 1,323 of 1,548.
Learn more
Before leaning on 61740's figures: local microclimates explains what one yard in Flanagan can differ from the 61740 normal, while zone vs. frost date explains why Zone 5b and Flanagan's frost date answer different questions.