Blacktail Deer Creek Trail

Overview

This Northern Range classic drops from open grasslands into cool Douglas‑fir forest and ends at a suspension bridge over the Yellowstone River. It’s commonly listed as 11 miles total (out and back) with about 1,100 feet of descent to the river—meaning you’ll earn it on the climb back. Some hikers report a shorter 7–8 mile outing when turning around at or near the bridge, so expect mileage to vary with your turnaround point and confirm with current maps.

Route snapshot

Start about 7 miles east of Mammoth Hot Springs on the Grand Loop Road. The first miles roll through broad, wildlife‑rich meadows before the trail tucks into a deeper valley with volcanic cliffs and striking columnar lava, then transitions to predominantly wooded walking as you approach the Yellowstone River. A side path roughly four miles in crosses Blacktail Deer Creek toward two rustic patrol cabins and river access. The marquee moment is the suspended pack bridge spanning the green waters of the Yellowstone; beyond it, a short forested stretch leads to meadows and the junction with the Yellowstone River Trail. Ambitious hikers can continue about 1.5 miles farther along the river to Knowles Falls (adds ~3 miles round trip).

Why hike it

• Big‑sky meadows, a creek‑to‑canyon transect, and a rare suspension‑bridge crossing in one moderate day.
• High odds of wildlife on the plateau, and diverse scenery that changes every couple of miles.
• Real geology on display: volcanic breccias and columnar lava above, active fluvial features in the river corridor.

Nature notes

Look for bison, elk, and pronghorn in the open country; both grizzly and black bears use this drainage, especially in shoulder seasons. In summer, the meadows pop with wildflowers and butterflies. Geologically, you’re walking through Yellowstone’s Northern Range—older Absaroka volcanic rocks draped by glacial deposits—before dropping to the actively carving Yellowstone River canyon.

Best time to hike

Late spring through fall. Early season can bring lingering snow, mud, and high creek flows; summer often means afternoon thunderstorms but also peak wildflowers; fall offers cooler temps and clearer trails. Start early for cooler air on the climb out and easier parking, and for softer side‑light on the meadows.

Connections, camping, and logistics

From the main trail you can link to the Blacktail Ponds Spur, Rescue Creek Trail, and the Yellowstone River Trail. The route extends across the Wyoming–Montana border toward Crevice Lake, with designated backcountry camps at Crevice Lake, Lower Blacktail Creek, and near the Yellowstone River Bridge. Overnight trips require a backcountry permit; camp only at assigned sites and follow food‑storage rules.

Regulations and safety

This is bear country—hike in groups, make noise in brushy sections, and carry bear spray (and know how to use it). Stay 100 yards from bears and wolves and 25 yards from all other wildlife. Pets aren’t allowed on park trails. Do not attempt to ford the Yellowstone River. Expect and yield to horseback riders. Treat all water, stay on established trails, and practice Leave No Trace.