Monticello, MO 63457 Frost Dates
63457, near Monticello, 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 10/23, roughly 194 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Monticello in Zone 6a (-10 to -5°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
Monticello'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
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Monticello against the rest of the dataset
Monticello's growing season runs about 194 days, ranking 19,654 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 658 of 1,129.
Learn more
Two guides worth reading on 63457: zone vs. frost date, on why Zone 6a and Monticello's frost date answer different questions, and the frost range, on how to read the range around Monticello's dates instead of trusting one.