Copper City, MI 49917 Frost Dates
Copper City, MI: when does the frost end?
Around 05/17 is the usual last spring frost, about 262 days away. Fall's first freeze usually shows up around 10/01, roughly 138 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Copper City in Zone 5b (-15 to -10°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 5 weeks until Copper City'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
05/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/03 and only about 1 year in 10 sees frost after that.
Copper City against the rest of the dataset
Copper City's growing season runs about 138 days, ranking 37,459 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 934 of 1,153.
Learn more
Before leaning on 49917's figures: zone vs. frost date explains why Zone 5b and Copper City's frost date answer different questions, while the frost range explains how to read the range around Copper City's dates instead of trusting one.