Callao, MO 63534 Frost Dates
Callao, MO: when does the frost end?
Typically, the last spring freeze lands around 04/08, roughly 223 days out. Fall's first freeze usually shows up around 10/28, roughly 201 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Callao in Zone 6a (-10 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 Callao'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
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/24 and only about 1 year in 10 sees frost after that.
Callao against the rest of the dataset
About 201 days separate Callao's last and first frost, putting it 17,657 of 40,283 ZIP codes nationally. Within MO, it ranks 379 of 1,129.
Learn more
Before leaning on 63534's figures: the frost range explains how to read the range around Callao's dates instead of trusting one, while local microclimates explains what one yard in Callao can differ from the 63534 normal.