Williamsville, MO 63967 Frost Dates
Williamsville, MO: when does the frost end?
Around 04/02 is the usual last spring frost, about 217 days away. Fall's first freeze usually shows up around 11/02, roughly 215 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Williamsville in Zone 7a (0 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
With roughly 9 weeks until Williamsville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/18 and only about 1 year in 10 sees frost after that.
Williamsville against the rest of the dataset
Williamsville's growing season runs about 215 days, ranking 14,188 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 132 of 1,129.
Learn more
Before leaning on 63967's figures: local microclimates explains what one yard in Williamsville can differ from the 63967 normal, while zone vs. frost date explains why Zone 7a and Williamsville's frost date answer different questions.