St. Robert, MO 65457 Frost Dates
65457, near St. Robert, MO: the frost window
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/24, roughly 193 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for St. Robert, not a forecast for this year.
Stretching the season past the first frost
St. Robert'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.
How much risk comes with planting early here
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
St. Robert against the rest of the dataset
At roughly 193 frost-free days, St. Robert places 19,839 of 40,283 ZIP codes in this dataset. Within MO, it ranks 669 of 1,129.
Learn more
Two guides worth reading on 65457: the frost range, on how to read the range around St. Robert's dates instead of trusting one, and local microclimates, on what one yard in St. Robert can differ from the 65457 normal.