Herrick, IL 62431 Frost Dates
Herrick, IL: when does the frost end?
Around 04/03 is the usual last spring frost, about 218 days away. Fall's first freeze usually shows up around 10/24, roughly 202 days after the last spring frost.
Herrick sits in USDA Zone 6b (-5 to 0°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 Herrick's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Herrick's last frost
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
Herrick against the rest of the dataset
About 202 days separate Herrick's last and first frost, putting it 17,344 of 40,283 ZIP codes nationally. Within IL, it ranks 186 of 1,548.
Learn more
Before leaning on 62431's figures: the frost range explains how to read the range around Herrick's dates instead of trusting one, while local microclimates explains what one yard in Herrick can differ from the 62431 normal.