Watseka, IL 60970 Frost Dates
60970, near Watseka, IL: the frost window
Typically, the last spring freeze lands around 04/24, roughly 239 days out. Fall's first freeze usually shows up around 10/16, roughly 174 days after the last spring frost.
Zone 5b (-15 to -10°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 Watseka, not a forecast for this year.
Stretching the season past the first frost
Watseka's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Watseka's last frost
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Watseka against the rest of the dataset
Watseka's growing season runs about 174 days, ranking 27,452 of 40,283 US ZIP codes measured here, longest to shortest. Within IL, it ranks 1,230 of 1,548.
Learn more
Two guides worth reading on 60970: the frost range, on how to read the range around Watseka's dates instead of trusting one, and local microclimates, on what one yard in Watseka can differ from the 60970 normal.