Hillman, MI 49746 Frost Dates
49746, near Hillman, MI: the frost window
The last spring frost here typically falls around 05/22, about 267 days from today. Fall's first freeze usually shows up around 09/27, roughly 127 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 Hillman, not a forecast for this year.
Stretching the season past the first frost
Hillman'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 Hillman's last frost
05/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Hillman against the rest of the dataset
At roughly 127 frost-free days, Hillman places 38,647 of 40,283 ZIP codes in this dataset. Within MI, it ranks 1,064 of 1,153.
Learn more
Two guides worth reading on 49746: local microclimates, on what one yard in Hillman can differ from the 49746 normal, and zone vs. frost date, on why Zone 5a and Hillman's frost date answer different questions.