Bessemer, MI 49911 Frost Dates
Frost dates for Bessemer, MI, ZIP 49911
Around 05/19 is the usual last spring frost, about 264 days away. The first fall frost typically arrives around 09/28, about 130 frost-free days later.
Zone 4b (-25 to -20°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 Bessemer, not a forecast for this year.
What to do before the first frost
Zone 4b around Bessemer has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Bessemer's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bessemer compares
Bessemer's growing season runs about 130 days, ranking 38,385 of 40,283 US ZIP codes measured here, longest to shortest. Within MI, it ranks 1,031 of 1,153.
Learn more
local microclimates explains what one yard in Bessemer can differ from the 49911 normal, and zone vs. frost date explains why Zone 4b and Bessemer's frost date answer different questions.