Franklin Grove, IL 61031 Frost Dates
Franklin Grove, 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 10/13, roughly 168 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Franklin Grove 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 Franklin Grove'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 05/12 and only about 1 year in 10 sees frost after that.
Franklin Grove against the rest of the dataset
Franklin Grove's growing season runs about 168 days, ranking 29,746 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,444 of 1,548.
Learn more
Before leaning on 61031's figures: the frost range explains how to read the range around Franklin Grove's dates instead of trusting one, while local microclimates explains what one yard in Franklin Grove can differ from the 61031 normal.