Caledonia, MO 63622 Frost Dates
63622, near Caledonia, MO: the frost window
Around 04/11 is the usual last spring frost, about 226 days away. Fall's first freeze usually shows up around 10/28, roughly 198 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Caledonia 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
Caledonia's growing season runs out in roughly 9 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 03/26 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.
Caledonia against the rest of the dataset
Caledonia's growing season runs about 198 days, ranking 18,556 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 525 of 1,129.
Learn more
Two guides worth reading on 63622: zone vs. frost date, on why Zone 6b and Caledonia's frost date answer different questions, and the frost range, on how to read the range around Caledonia's dates instead of trusting one.