Interstate 94 in Montana

Interstate 94 (I-94) is an east–west Interstate Highway, which links Billings, Montana, to the Canada–US border in Port Huron, Michigan. The portion in the US state of Montana is 250 mi long, linking seven counties through the central part of the state.

The speed limit has been 80 mph since January 2016, except near Billings where it is 65 mph.

Yellowstone County
I-94 starts in Yellowstone County in Billings at I-90 and travels northeast to the towns of Huntley, Ballantine, Pompeys Pillar, and Custer.

Treasure, Rosebud, and Custer counties
Entering Treasure County, I-94 passes near the small towns of Bighorn and Hysham; there is a little ranch access at milemarker 63.01. After entering Treasure County, the next county is Rosebud County, about 15 mi east. There are two intersections of US Highway 12 (US 12) and Montana Highway 59 (MT 59) before entering Forsyth, after that is Custer County which is the east end of US 12 after crossing the city of Miles City.

Prairie, Dawson, and Wibaux counties
After entering Prairie County after passing the small towns of Terry and Fallon, the next county is Dawson County, entering the cities of Glendive which connects with MT 16 and entering the city of Wibaux before entering the North Dakota state line.

History
Between its western terminus in Billings and the North Dakota state line, I-94 replaced US 10.