Michigan’s 170 marten records cluster tightly in the western Upper Peninsula, around Ottawa National Forest, Porcupine Mountains Wilderness State Park, and the Keweenaw Peninsula, with NatureServe ranking the species S3, vulnerable, in the state. That footprint isn’t an accident of geography: it traces almost exactly where Michigan brought martens back after losing them entirely.
A recovery species in the western UP
Heavy logging and unregulated trapping wiped martens out of Michigan by the early 1900s. The state reintroduced them to the Upper Peninsula starting in 1955, using stock trapped elsewhere in the Great Lakes region, and later reintroduced a separate group into the northern Lower Peninsula’s Manistee National Forest. Every Michigan marten record today traces back to one of those two restocking efforts.
Why old-growth forest matters here
Martens need mature conifer or mixed forest with plenty of downed logs, cavities, and connected canopy to hunt and den in, which is exactly what the Porcupine Mountains protect: one of the largest tracts of old-growth hemlock-hardwood forest left in the Midwest. Records spike hard in December, most likely because fresh snow across the Keweenaw’s heavy lake-effect belt makes marten tracks far easier to spot and photograph than the animal itself.
Status in Michigan
NatureServe ranks the marten S3, vulnerable, and Michigan lists it as native. It’s a genuine comeback story built on two separate reintroductions, still tied closely to the state’s remaining blocks of old, structurally complex forest.
