Montana Borders: States, Map & Complete Guide

British Columbia and Montana are separated by a border located in Montana's northwestern corner. The boundary follows the 49th parallel north latitude and runs through mountainous terrain in the Rocky Mountains.

The Montana-British Columbia border extends for about 65 miles from Idaho in the west to Alberta in the east. The border passes through remote mountain wilderness. Only two Montana counties touch this border: Lincoln and Flathead. The border region includes portions of Glacier National Park on the U.S. side and various parks on the Canadian side.

Alberta and Montana are separated by a border located on Montana's northern edge. The state line follows the 49th parallel north latitude, creating a straight east-west boundary.

The Montana-Alberta border extends for about 300 miles from British Columbia in the west to Saskatchewan in the east. This is Montana's longest international border section. Montana counties along this border include Flathead, Glacier, Toole, Liberty, Hill, Blaine, and Phillips. The border transitions from mountains in the west to prairie in the east. Major crossing points include Sweetgrass-Coutts and Chief Mountain.

Saskatchewan and Montana are separated by a border located in Montana's northeastern corner. The boundary follows the 49th parallel north latitude through prairie terrain.

The Montana-Saskatchewan border extends for about 180 miles from Alberta in the west to North Dakota in the east. Montana counties along this border include Phillips, Valley, Daniels, and Sheridan. The border region is characterized by flat prairie and agricultural land. Major crossing points include Port of Raymond and Port of Scobey.

Idaho and Montana are separated by a border located on Montana's western edge. The boundary runs roughly north-south from British Columbia in the north to Wyoming in the south, following the Continental Divide and Bitterroot Range for much of its length.

The Montana-Idaho border extends for about 545 miles, making it Montana's longest state border. The border follows mountain ridges through the Rocky Mountains. Montana counties along this border include Lincoln, Sanders, Mineral, Missoula, Ravalli, and Beaverhead. The border region is characterized by rugged mountain terrain, dense forests, and wilderness areas.

Wyoming and Montana are separated by a border located on Montana's southern edge. The state line runs roughly east-west from Idaho in the west to South Dakota in the east.

The Montana-Wyoming border extends for about 390 miles. The border follows mostly straight survey lines, though it follows mountain features in the western section. Montana counties along this border include Beaverhead, Madison, Gallatin, Park, Stillwater, Carbon, Big Horn, Powder River, and Carter. The border passes through Yellowstone National Park in the southwest.

North Dakota and Montana are separated by a border located on Montana's eastern edge. The boundary runs roughly north-south from Saskatchewan in the north toward South Dakota in the south.

The Montana-North Dakota border extends for about 215 miles. The border follows a relatively straight survey line through prairie terrain. Montana counties along this border include Sheridan, Roosevelt, Richland, and Dawson. The border region is characterized by flat to rolling prairie and agricultural land.

South Dakota and Montana are separated by a border in Montana's southeastern corner. The boundary runs roughly north-south for a short distance where Montana, North Dakota, South Dakota, and Wyoming meet.

The Montana-South Dakota border extends for only about 75 miles, making it Montana's shortest state border. Only two Montana counties touch this border: Carter and Powder River. The border region consists of prairie and badlands terrain.