Black Jack, MO 63034 Frost Dates
Black Jack, MO: when does the frost end?
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 11/04, roughly 215 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Black Jack 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 10 weeks until Black Jack'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 03/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Black Jack against the rest of the dataset
Black Jack's growing season runs about 215 days, ranking 14,076 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 118 of 1,129.
Learn more
Before leaning on 63034's figures: local microclimates explains what one yard in Black Jack can differ from the 63034 normal, while zone vs. frost date explains why Zone 7a and Black Jack's frost date answer different questions.