Potosi, MO 63664 Frost Dates
Potosi, MO: when does the frost end?
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 Potosi 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
With roughly 9 weeks until Potosi's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Potosi's last frost
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.
Potosi against the rest of the dataset
Potosi's growing season runs about 198 days, ranking 18,442 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 488 of 1,129.
Learn more
Before leaning on 63664's figures: the frost range explains how to read the range around Potosi's dates instead of trusting one, while local microclimates explains what one yard in Potosi can differ from the 63664 normal.