Blacktail Deer Creek Trail is a 3.7 mile lightly trafficked point-to-point trail located near Yellowstone National Park, WY that features a lake and is rated as moderate. The trail offers a number of activity options and is accessible from May until September.
Located in the north-central sector of Yellowstone National Park.
Great trail but keep in mind you'll be going mostly uphill on the way back.
We chose this trial because of the backcountry campgrounds along the way. We were backpacking with kids and the campgrounds are close enough to the trailhead that it worked well for young kids (4+). It's a bit of a haul up the grassy hill in the first mile. After that, it heads down into the canyon of the Yellowstone River. There is solid fly fishing for Brook Trout in Blacktail Deer Creek.
From NPS: "This trail follows Blacktail Deer Creek as it descends 1,100 feet through rolling, grassy hills and Douglas-fir where it reaches the Yellowstone River. The trail continues across the Yellowstone River on a steel suspension bridge and joins the Yellowstone River Trail."