Mexico, MO 65285 Frost Dates
65285, near Mexico, 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.
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 Mexico, not a forecast for this year.
Stretching the season past the first frost
Mexico'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 Mexico's last frost
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.
Mexico against the rest of the dataset
Mexico's growing season runs about 197 days, ranking 18,643 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 535 of 1,129.
Learn more
Two guides worth reading on 65285: zone vs. frost date, on why Zone 6b and Mexico's frost date answer different questions, and the frost range, on how to read the range around Mexico's dates instead of trusting one.