Union City, MI 49094 Frost Dates
Union City, MI: when does the frost end?
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/19, roughly 170 days after the last spring frost.
Zone 6a (-10 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 Union City, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Union City's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Union City's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Union City against the rest of the dataset
Union City's growing season runs about 170 days, ranking 29,068 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 328 of 1,153.
Learn more
Before leaning on 49094's figures: the frost range explains how to read the range around Union City's dates instead of trusting one, while local microclimates explains what one yard in Union City can differ from the 49094 normal.