Jamestown, MO 65046 Frost Dates
65046, near Jamestown, MO: the frost window
The last spring frost here typically falls around 04/11, about 226 days from today. Fall's first freeze usually shows up around 10/25, roughly 195 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 Jamestown, not a forecast for this year.
Stretching the season past the first frost
Jamestown'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 Jamestown's last frost
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Jamestown against the rest of the dataset
About 195 days separate Jamestown's last and first frost, putting it 19,344 of 40,283 ZIP codes nationally. Within MO, it ranks 610 of 1,129.
Learn more
Two guides worth reading on 65046: zone vs. frost date, on why Zone 6b and Jamestown's frost date answer different questions, and the frost range, on how to read the range around Jamestown's dates instead of trusting one.