Alma, IL 62807 Frost Dates
Alma, IL: when does the frost end?
Typically, the last spring freeze lands around 04/09, roughly 224 days out. Fall's first freeze usually shows up around 10/26, roughly 197 days after the last spring frost.
Alma sits in USDA Zone 6b (-5 to 0°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 Alma's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Alma's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/23 and only about 1 year in 10 sees frost after that.
Alma against the rest of the dataset
At roughly 197 frost-free days, Alma places 18,812 of 40,283 ZIP codes in this dataset. Within IL, it ranks 324 of 1,548.
Learn more
Before leaning on 62807's figures: zone vs. frost date explains why Zone 6b and Alma's frost date answer different questions, while the frost range explains how to read the range around Alma's dates instead of trusting one.