Fairfield, IL 62837 Frost Dates
Fairfield, IL: when does the frost end?
Around 04/04 is the usual last spring frost, about 219 days away. Fall's first freeze usually shows up around 10/28, roughly 206 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Fairfield, not a forecast for this year.
Stretching the season past the first frost
With roughly 9 weeks until Fairfield's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Fairfield's last frost
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Fairfield against the rest of the dataset
Fairfield's growing season runs about 206 days, ranking 16,005 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 92 of 1,548.
Learn more
Before leaning on 62837's figures: zone vs. frost date explains why Zone 6b and Fairfield's frost date answer different questions, while the frost range explains how to read the range around Fairfield's dates instead of trusting one.