Napoleon, MO 64074 Frost Dates
64074, near Napoleon, MO: the frost window
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/18, roughly 180 days after the last spring frost.
Zone 6a (-10 to -5°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 Napoleon, not a forecast for this year.
Stretching the season past the first frost
Napoleon's growing season runs out in roughly 7 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
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 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.
Napoleon against the rest of the dataset
Napoleon's growing season runs about 180 days, ranking 25,070 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 1,027 of 1,129.
Learn more
Two guides worth reading on 64074: local microclimates, on what one yard in Napoleon can differ from the 64074 normal, and zone vs. frost date, on why Zone 6a and Napoleon's frost date answer different questions.