Montana Highway 5 (MT 5) is a 65.573-mile-long (105.530 km) state highway connecting with North Dakota's Highway 5, the 337 mile long ND highway. MT 5 runs from the ND border to Scobey, Montana. It was designated in 1939. The road closely follows the topographic contours of the land and, in the extreme winter climate of northeastern Montana, this often leads to road closures due to drifting snow.

County	Location	mi	km	Destinations	Notes
Daniels	Scobey	0.000	0.000	MT 13 – Wolf Point, Canada
	Flaxville	11.404	18.353	S-251 south / S-511 north – Flaxville, Whitetail
Sheridan	​	30.367	48.871	S-374 north – Outlook
	Plentywood	41.163	66.245	MT 16 north – Raymond, Regina	West end of MT 16 overlap
		43.190	69.508	MT 16 south – Culbertson	East end of MT 16 overlap
	Westby	65.573	105.530	ND 5 east – Crosby, N.D.	Continuation into North Dakota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus