Lyndon, IL 61261 Frost Dates
Lyndon, IL: when does the frost end?
Typically, the last spring freeze lands around 04/26, roughly 241 days out. Fall's first freeze usually shows up around 10/13, roughly 167 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Lyndon in Zone 5b (-15 to -10°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 7 weeks until Lyndon's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Lyndon against the rest of the dataset
About 167 days separate Lyndon's last and first frost, putting it 30,139 of 40,283 ZIP codes nationally. Within IL, it ranks 1,460 of 1,548.
Learn more
Before leaning on 61261's figures: the frost range explains how to read the range around Lyndon's dates instead of trusting one, while local microclimates explains what one yard in Lyndon can differ from the 61261 normal.