South Boundary Trail: Grassy Lake-South Entrance

Yellowstone National Park

strenuous

Length: 8.12 mi

Est. time: 3h 18m

Gain: 1,167 ft

Loss: 961 ft

Max elev: 7,725 ft

Point-to-pointTrail class 1Earthhike

Elevation profile

+1,167 ft gain · −961 ft loss — an estimate from a DEM.

Trailhead & logistics

Trailhead parking (Place)

Headwaters Campground (Campground)

Build a loop

Connects to:

Beula Lake Trail

Connect the dots

Learn:

A Bear's Menu Atomic Elements and Archeology: Tracing Ancient Resource Access and Trade Routes Using XRF Dueling Mandates: Preservation and Use of National Parks Hard Core Rock How Geysers Erupt Imaginary Yellowstone Road Trip

Journeys:

Thomas Moran Horace M. Albright Philetus W. Norris William Henry Jackson Ferdinand Hayden

Plan smart, verify on site

Length, elevation, and difficulty are estimates derived from open data (NPS Public Trails GIS, high confidence) — not a safety guarantee. Conditions change; check current closures, weather, and water, and carry the essentials. Always defer to NPS.gov and park rangers.

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