U.S. Route 20 in Montana

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U.S. Highway 20 marker

U.S. Highway 20
US 20 highlighted in red
Route information
Maintained by MDT
Length9.680 mi[1] (15.578 km)
Major junctions
West end US 20 at the Idaho state line
  US 191 / US 287 in West Yellowstone
East end US 20 / US 191 / US 287 east of the Yellowstone National Park West Entrance
Highway system
MT-19.svg MT 19MT-21.svg MT 21

U.S. Route 20 (US 20) is a west-east highway that travels from Targhee Pass at the Idaho state line to the west portion of Yellowstone National Park at the Wyoming state line.

Route description[edit]

US 20 enters Montana from Idaho at Targhee Pass at the Continental Divide. From there, it curves north and east down the mountain along a tree-lined, two-lane highway with a westbound climbing lane. An access road to the north provides access to Hebgen Lake. The highway then continues through Yellowstone National Park to Wyoming.


Major intersections[edit]

The entire route is in Gallatin County.

Continental Divide0.0000.000 US 20 west – Idaho FallsContinuation into Idaho
Targhee Pass; MontanaIdaho line
West Yellowstone9.31814.996 US 191 north / US 287 north (Canyon Street north) – BozemanWestern end of US 191/US 287 concurrency
Yellowstone National Park9.68015.578West Entrance; closed December-April
11.819.0 To US 20 east / US 191 south / US 287 south (West Entrance Road)Continuation into Wyoming; US 20/US 191/US 287 resume outside of Yellowstone National Park
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  •       Closed/former
  •       Concurrency terminus
  •       Tolled


  1. ^ a b Montana Department of Transportation (2013). "Montana Road Log" (PDF). Helena: Montana Department of Transportation. Retrieved September 13, 2014.

External links[edit]

Route map:

KML is from Wikidata
U.S. Route 20
Previous state:
Montana Next state: