Synaptomys borealis occurs in northern North America. Maine's wildlife agency describes it in wet meadows and bogs with sphagnum, and lists sedges and grasses among its foods.
The upper fur is dull brown, the head is grizzled gray, and the underside is gray. Fur near the ears may have rusty-colored tips.
In Maine, it is recorded in wet meadows and bogs with sphagnum, sedges, and grasses. The state profile also mentions springs and mossy logs.
An extinction-risk assessment has not been added yet.