Ishpeming, MI 49808 Frost Dates
49808, near Ishpeming, MI: the frost window
Typically, the last spring freeze lands around 06/05, roughly 281 days out. Fall's first freeze usually shows up around 09/10, roughly 96 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Ishpeming 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
Ishpeming's growing season runs out in roughly 2 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Ishpeming's last frost
06/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/24 and only about 1 year in 10 sees frost after that.
Ishpeming against the rest of the dataset
Ishpeming's growing season runs about 96 days, ranking 39,792 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 1,140 of 1,153.
Learn more
Two guides worth reading on 49808: local microclimates, on what one yard in Ishpeming can differ from the 49808 normal, and zone vs. frost date, on why Zone 5b and Ishpeming's frost date answer different questions.