La Harpe, IL 61450 Frost Dates
La Harpe, IL: when does the frost end?
The last spring frost here typically falls around 04/18, about 233 days from today. Fall's first freeze usually shows up around 10/20, roughly 185 days after the last spring frost.
La Harpe sits in USDA Zone 6a (-10 to -5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 8 weeks until La Harpe's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
La Harpe against the rest of the dataset
At roughly 185 frost-free days, La Harpe places 23,236 of 40,283 ZIP codes in this dataset. Within IL, it ranks 834 of 1,548.
Learn more
Before leaning on 61450's figures: the frost range explains how to read the range around La Harpe's dates instead of trusting one, while local microclimates explains what one yard in La Harpe can differ from the 61450 normal.