Union Star, MO 64494 Frost Dates
Union Star, MO: when does the frost end?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/19, roughly 184 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Union Star 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 7 weeks until Union Star'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
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 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.
Union Star against the rest of the dataset
At roughly 184 frost-free days, Union Star places 23,639 of 40,283 ZIP codes in this dataset. Within MO, it ranks 919 of 1,129.
Learn more
Before leaning on 64494's figures: local microclimates explains what one yard in Union Star can differ from the 64494 normal, while zone vs. frost date explains why Zone 6a and Union Star's frost date answer different questions.