Martinsburg, MO 65264 Frost Dates
65264, near Martinsburg, MO: the frost window
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 10/25, roughly 197 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Martinsburg in Zone 6b (-5 to 0°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
Martinsburg'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.
Why 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/26 and only about 1 year in 10 sees frost after that.
Martinsburg against the rest of the dataset
At roughly 197 frost-free days, Martinsburg places 18,835 of 40,283 ZIP codes in this dataset. Within MO, it ranks 558 of 1,129.
Learn more
Two guides worth reading on 65264: local microclimates, on what one yard in Martinsburg can differ from the 65264 normal, and zone vs. frost date, on why Zone 6b and Martinsburg's frost date answer different questions.