Manteno, IL 60950 Frost Dates
Manteno, IL: when does the frost end?
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/24, roughly 188 days after the last spring frost.
Manteno sits in USDA Zone 5b (-15 to -10°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 Manteno's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Manteno's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 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.
Manteno against the rest of the dataset
About 188 days separate Manteno's last and first frost, putting it 21,932 of 40,283 ZIP codes nationally. Within IL, it ranks 672 of 1,548.
Learn more
Before leaning on 60950's figures: zone vs. frost date explains why Zone 5b and Manteno's frost date answer different questions, while the frost range explains how to read the range around Manteno's dates instead of trusting one.