Mount Vernon, MO 65712 Frost Dates
Mount Vernon, MO: when does the frost end?
Around 04/14 is the usual last spring frost, about 229 days away. Fall's first freeze usually shows up around 10/21, roughly 188 days after the last spring frost.
Zone 7a (0 to 5°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 Mount Vernon, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Mount Vernon'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
04/14 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 05/01 and only about 1 year in 10 sees frost after that.
Mount Vernon against the rest of the dataset
Mount Vernon's growing season runs about 188 days, ranking 22,012 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 803 of 1,129.
Learn more
Before leaning on 65712's figures: local microclimates explains what one yard in Mount Vernon can differ from the 65712 normal, while zone vs. frost date explains why Zone 7a and Mount Vernon's frost date answer different questions.