St. Peter, IL 62880 Frost Dates
St. Peter, IL: when does the frost end?
Typically, the last spring freeze lands around 04/03, roughly 218 days out. Fall's first freeze usually shows up around 10/24, roughly 202 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts St. Peter in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until St. Peter's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around St. Peter's last frost
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
St. Peter against the rest of the dataset
At roughly 202 frost-free days, St. Peter places 17,351 of 40,283 ZIP codes in this dataset. Within IL, it ranks 188 of 1,548.
Learn more
Before leaning on 62880's figures: the frost range explains how to read the range around St. Peter's dates instead of trusting one, while local microclimates explains what one yard in St. Peter can differ from the 62880 normal.