Olmsted, IL 62970 Frost Dates
Olmsted, IL: when does the frost end?
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 10/31, roughly 211 days after the last spring frost.
Olmsted sits in USDA Zone 7a (0 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 9 weeks until Olmsted's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/02 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 04/17 and only about 1 year in 10 sees frost after that.
Olmsted against the rest of the dataset
At roughly 211 frost-free days, Olmsted places 14,885 of 40,283 ZIP codes in this dataset. Within IL, it ranks 43 of 1,548.
Learn more
Before leaning on 62970's figures: local microclimates explains what one yard in Olmsted can differ from the 62970 normal, while zone vs. frost date explains why Zone 7a and Olmsted's frost date answer different questions.