If you’re looking for the most underrated hike in Yellowstone National Park, take this active and adventurous trek to the best swimming hole in Wyoming. You’ll wonder why you didn’t plan this one sooner!

The long hike to Union Falls is one of the most popular in Wyoming, and this 15 mile out-and-back trail is surely bucket-list-worthy.
AllTrails / Shaun Merchant
Along the way, you'll be hiking near the Mountain Ash Creek. This peaceful river is beautiful all year long.
AllTrails / Ronald Scott
There are a few shaky river crossings along the way, so be sure to wear sturdy boots and bring trekking poles
AllTrails / David Ashby
Right before you reach Union Falls, you'll find a fork in the trail. Head left and you'll find Ouzel Pool. Congratulations - you've just found the best swimming hole in Wyoming.
AllTrails / Shaun Merchant
The geothermal water is heated to about 75 degrees, so it's a great spot to go for a dip! You'll likely have it all to yourself if you go in late summer or early fall.
AllTrails / Kendall Taylor
Test the depth and jump in from the crest of the cascade. It's usually deep enough to use the rocks as a diving board.
AllTrails / David Ashby
Once you've cooled off in Ouzel Pool, finish up your hike by finding Union Falls. At 260 feet high, it's the second highest waterfall in Yellowstone National Park.
AllTrails / Kendall Taylor
As you make your way back to the trailhead, enjoy the sights and sounds of pristine Wyoming wilderness.
AllTrails / Sara Mersing

You’ll want to carry bear spray with you and hike in groups, as this trail is a bit off the beaten path, and many black bears and grizzlies make their homes in these forests.

For more incredible waterfall hikes in Wyoming, read 9 Unbelievable Wyoming Waterfalls Hiding In Plain Sight – No Hiking Required.

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