Chillicothe, MO 64601 Frost Dates
64601, near Chillicothe, MO: the frost window
The last spring frost here typically falls around 04/15, about 230 days from today. Fall's first freeze usually shows up around 10/21, roughly 187 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 Chillicothe, not a forecast for this year.
Stretching the season past the first frost
Chillicothe'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
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 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.
Chillicothe against the rest of the dataset
About 187 days separate Chillicothe's last and first frost, putting it 22,317 of 40,283 ZIP codes nationally. Within MO, it ranks 834 of 1,129.
Learn more
Two guides worth reading on 64601: zone vs. frost date, on why Zone 6a and Chillicothe's frost date answer different questions, and the frost range, on how to read the range around Chillicothe's dates instead of trusting one.