Westfield, IL 62474 Frost Dates
62474, near Westfield, IL: the frost window
The last spring frost here typically falls around 04/15, about 230 days from today. Fall's first freeze usually shows up around 10/23, roughly 187 days after the last spring frost.
Westfield 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
Westfield's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 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.
Westfield against the rest of the dataset
Westfield's growing season runs about 187 days, ranking 22,550 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 784 of 1,548.
Learn more
Two guides worth reading on 62474: local microclimates, on what one yard in Westfield can differ from the 62474 normal, and zone vs. frost date, on why Zone 6a and Westfield's frost date answer different questions.