Clayton, MO 63105 Frost Dates
Clayton, MO: when does the frost end?
The last spring frost here typically falls around 04/01, about 216 days from today. Fall's first freeze usually shows up around 11/04, roughly 218 days after the last spring frost.
Clayton sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 10 weeks until Clayton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Clayton's last frost
04/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 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.
Clayton against the rest of the dataset
About 218 days separate Clayton's last and first frost, putting it 13,228 of 40,283 ZIP codes nationally. Within MO, it ranks 76 of 1,129.
Learn more
Before leaning on 63105's figures: the frost range explains how to read the range around Clayton's dates instead of trusting one, while local microclimates explains what one yard in Clayton can differ from the 63105 normal.