I-90 passes through Montana for approximately 452 miles. It enters the state from Idaho in the west and exits into Wyoming in the east. Major cities along I-90 in Montana include Missoula, Butte, Bozeman, and Billings.
Interstate 15 (I-15)
I-15 passes through Montana for approximately 200 miles. It enters the state from Idaho in the southwest and exits into Wyoming in the southeast. Major cities along I-15 in Montana include Dillon, Butte, and Great Falls.
Interstate 94 (I-94)
I-94 passes through Montana for approximately 100 miles. It enters the state from North Dakota in the northeast and exits into Wyoming in the southeast. Major cities along I-94 in Montana include Glendive and Miles City.
In addition to these major interstates, there are also several other smaller interstates that pass through Montana. These include:
Interstate 295
Interstate 395
Interstate 495
Interstate 595
Interstate 695
Interstate 795
Interstate 895