Chesterfield, MO 63017 Frost Dates
63017, near Chesterfield, MO: the frost window
Around 04/04 is the usual last spring frost, about 219 days away. Fall's first freeze usually shows up around 10/29, roughly 206 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Chesterfield in Zone 7a (0 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
Chesterfield's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
Chesterfield against the rest of the dataset
At roughly 206 frost-free days, Chesterfield places 15,950 of 40,283 ZIP codes in this dataset. Within MO, it ranks 220 of 1,129.
Learn more
Two guides worth reading on 63017: the frost range, on how to read the range around Chesterfield's dates instead of trusting one, and local microclimates, on what one yard in Chesterfield can differ from the 63017 normal.