Harbor Beach, MI 48441 Frost Dates
Harbor Beach, MI: when does the frost end?
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/24, roughly 173 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Harbor Beach 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 8 weeks until Harbor Beach'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
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 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.
Harbor Beach against the rest of the dataset
Harbor Beach's growing season runs about 173 days, ranking 27,959 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 230 of 1,153.
Learn more
Before leaning on 48441's figures: the frost range explains how to read the range around Harbor Beach's dates instead of trusting one, while local microclimates explains what one yard in Harbor Beach can differ from the 48441 normal.