Union Falls Trail

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This reflects the estimated time the majority of users will take on this trail. If you are slower, add time to the top-end figure. If you are fast, then you may complete this route faster than this time range.
This reflects the return distance of this route as measured by the GPS file.
28.0 km
This reflects the total elevation gained throughout this route as measured by the GPS file. This includes all ascents and descents, and is higher than what is quoted in most route guides, which simply measure the distance between the starting-point and high-point of the route.
258 m
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Directions to Trailhead

The Union Falls Trail is a fantastic hike in the Wyoming wilderness. This trail is long but relatively flat and can be hiked in one, big day. Union Falls itself is an incredible 280 ft-tall waterfall. These falls are the second tallest waterfall in Yellowstone National Park.

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Route Description for Union Falls Trail

The Union Falls Trail is a gorgeous hike on the southern border of Yellowstone National Park. This is a long hike; if you plan to complete this whole route in one day, start early in the morning and bring a headlamp in case you wind up finishing in the dark. With over 17.0 mi of trail to explore and a spectacular waterfall at the end, the Union Falls Trail is a great way to spend quality time in the Wyoming wilderness with loved ones.

Beginning at the Fish Lake Trailhead, follow the path north and cross over the Fall River. At the Fall River Cutoff Campground, take the trail on your right, then follow it as it runs parallel to Mountain Ash Creek to Union Falls.

Enjoy your time at Union Falls. At 280 ft tall, these waterfalls are the second largest falls in Yellowstone National Park.

When you are ready to head home, simply retrace your steps back to the Fish Lake Trailhead, where you began.

Getting to the Union Falls Trail Trailhead

This hike begins at the Fish Lake Trailhead in the Winegar Hole Wilderness Area.

Route Information

  • Backcountry Campground

    Falls River Cutoff, Mountain Ash Creek, Union Falls, 9C4S

  • When to do

    May to October

  • Pets allowed


  • Family friendly


  • Route Signage


  • Crowd Levels


  • Route Type

    Out and back

Union Falls Trail Elevation Graph

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