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Click for Google Map. Our GPS coordinates: 45deg 20' 29.50 N 111deg 42' 50.12 W. Ennis is located in southwestern Montana an hour from Bozeman to the northeast and Yellowstone National Park to the south. US Highway 287 runs through Ennis. To the north is I-90 (45 miles) and to the south is Yellowstone National Park (70 miles).
Roadtrip Itinerary: Traveling from Bozeman to Yellowstone. 1  Day 1: Seeing Bozeman: Vibrant Downtown. 2  Day 2: Leaving Bozeman to Ennis, MT on the Backroad. 3  Day 3: Exploring Ennis, MT. 4  Day 4: Traveling from Ennis to Yellowstone on US-287.