Boyne Falls, MI 49730 Frost Dates
49730, near Boyne Falls, MI: the frost window
The last spring frost here typically falls around 05/25, about 270 days from today. Fall's first freeze usually shows up around 09/26, roughly 125 days after the last spring frost.
Zone 5a (-20 to -15°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 Boyne Falls, not a forecast for this year.
Stretching the season past the first frost
Boyne Falls's growing season runs out in roughly 4 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 Boyne Falls's last frost
05/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/08 and only about 1 year in 10 sees frost after that.
Boyne Falls against the rest of the dataset
Boyne Falls's growing season runs about 125 days, ranking 38,804 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 1,082 of 1,153.
Learn more
Two guides worth reading on 49730: the frost range, on how to read the range around Boyne Falls's dates instead of trusting one, and local microclimates, on what one yard in Boyne Falls can differ from the 49730 normal.