Princeville, IL 61479 Frost Dates
Princeville, IL: when does the frost end?
The last spring frost here typically falls around 04/22, about 237 days from today. Fall's first freeze usually shows up around 10/14, 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 Princeville, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Princeville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/22 isn't a guarantee
04/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Princeville against the rest of the dataset
About 174 days separate Princeville's last and first frost, putting it 27,512 of 40,283 ZIP codes nationally. Within IL, it ranks 1,248 of 1,548.
Learn more
Before leaning on 61479's figures: zone vs. frost date explains why Zone 5b and Princeville's frost date answer different questions, while the frost range explains how to read the range around Princeville's dates instead of trusting one.