It begins at MT 200 near Brockway, and ends at the Saskatchewan border at Port of Opheim.

The route then proceeds northward through a rural area along the eastern shore of Fort Peck Lake.

It intersects with MT 117, as it exits Fort Peck, and enters Wheeler.

An intersection with Montana Secondary Highway 248 (S-248) follows, and MT 24 reaches its end at the Saskatchewan border, north of Port of Opheim.

A former MT 24 ran between Marion and Jennings in the 1930s, which is now known as Pleasant Valley Road.