Lava Creek Trail

Overview

If you want a big Yellowstone payoff without a big effort, this one delivers. Starting near Mammoth Hot Springs, Lava Creek Trail serves up a safe, high vantage over 60‑foot Undine Falls and then, if you’re up for more, a quieter canyon walk toward the Lava Creek–Gardner River confluence with views toward Bunsen Peak. The tread is natural dirt singletrack with limited shade, and the first ~250 feet from the picnic area are level, hard‑packed, and easy going.

Route options and distance

• Easiest win: About 1.0 mile round trip to the brink area above Undine Falls and back. Mostly flat and quick, with big waterfall views.
• Better workout: Continue along the canyon rim and descend to the Lava Creek–Gardner River confluence, up to roughly 5.6 miles round trip with about 750 feet of cumulative gain. The climb back out feels steep and sun‑exposed.
• Legacy route (for context): Historically this was a 4.2‑mile one‑way between Mammoth Campground and Lava Creek Picnic Area. A bridge near Mammoth was washed out in 2022, so plan on an out‑and‑back from the picnic area until repairs are announced. Some hikers extend farther along the canyon for a longer day; always check current conditions first.

What you’ll see

Undine Falls is the headline—an easy, high perspective on a classic Yellowstone cascade. Beyond the falls the trail quiets down, skirting a pretty canyon with occasional peeks at Bunsen Peak and the Gardner River bridge. It’s a good place to notice how water has carved the landscape here over time.

Wildlife and safety

This corridor is real wildlife country—both grizzly and black bears use these drainages. Hike in a group, make noise, and carry bear spray where you can reach it. Give all wildlife space (far more than you think), and stay on the established path. Edges above Undine Falls are exposed—stay well back. Rivers here are swift and cold; don’t attempt to swim or scramble into the water. Expect limited shade, especially on the climb from the confluence—start early and pack sun protection and enough water.

Access and logistics

Begin at the Lava Creek Picnic Area, which has a decent parking lot and a pit toilet. A short path crosses the road/bridge to the signed trail, then climbs briefly to the rim. Pets aren’t allowed on this or any Yellowstone hiking trail. Day hiking requires no permit, but overnight backcountry trips and some activities (like fishing) do require permits—know the rules before you go.

Best time to hike

Snow tends to melt out here earlier than higher‑elevation trails, making late spring through early fall the sweet spot. Summer afternoons can be hot on the exposed slopes; mornings bring cooler temps and calmer vibes. In winter, the trail can be traveled with snowshoes or traction if you’re prepared for cold and variable conditions.