Bethany, MO 64424 Frost Dates
64424, near Bethany, MO: the frost window
Typically, the last spring freeze lands around 04/16, roughly 231 days out. Fall's first freeze usually shows up around 10/22, roughly 186 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bethany in Zone 6a (-10 to -5°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
Bethany's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Bethany's last frost
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Bethany against the rest of the dataset
At roughly 186 frost-free days, Bethany places 22,826 of 40,283 ZIP codes in this dataset. Within MO, it ranks 878 of 1,129.
Learn more
Two guides worth reading on 64424: the frost range, on how to read the range around Bethany's dates instead of trusting one, and local microclimates, on what one yard in Bethany can differ from the 64424 normal.