Bethalto, IL 62067 Frost Dates
Bethalto, IL: when does the frost end?
Around 04/04 is the usual last spring frost, about 219 days away. Fall's first freeze usually shows up around 11/05, roughly 214 days after the last spring frost.
Bethalto 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 10 weeks until Bethalto's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/04 isn't a guarantee
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/19 and only about 1 year in 10 sees frost after that.
Bethalto against the rest of the dataset
About 214 days separate Bethalto's last and first frost, putting it 14,240 of 40,283 ZIP codes nationally. Within IL, it ranks 16 of 1,548.
Learn more
Before leaning on 62067's figures: the frost range explains how to read the range around Bethalto's dates instead of trusting one, while local microclimates explains what one yard in Bethalto can differ from the 62067 normal.