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Bunsen Peak


Commanding views of the Mammoth Hot Springs area, and the Gallatin and Washburn mountains!

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Out and Back

8,555' 2,608 m


7,284' 2,220 m


1,285' 392 m


1,284' 391 m



Avg Grade (6°)


Max Grade (28°)

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Features Birding · Views · Wildflowers

Because of its lower elevation, Bunsen Peak is one of the earliest climbable peaks in Yellowstone. It usually is free of snow by mid-June.


Bunsen Peak was a favorite climb of early Yellowstone explorers. No wonder; this relatively short outing affords commanding views of the Mammoth Hot Springs area, as well as the Gallatin and Washburn mountains. This route also provides an excellent opportunity to view the effects of the 1988 fires.


This popular trail quickly begins its 1,300 foot climb through forests burned in 1988. Soon, the trail grows steeper and enters a series of switchbacks. Northern switchbacks afford impressive views of Cathedral Rock, the Hoodoos, Terrace Mountain, and the Golden Gate. The large rock outcrop that protrudes from Bunsen Peak was named Cathedral Rock for its "spire-like forms." The rock-slides of gray limestone blocks, beneath you were dubbed "The Hoodoos," because of the rock's ghostly shapes. These travertine blocks are remains of ancient hot spring terraces (similar to Mammoth Hot Springs) that over thousands of years broke away and cascaded down from the top of Terrace Mountain. In the 1880s, a stagecoach road was built following a route similar to the current highway. This impressive feat of engineering, was called the "Golden Gate" because of the golden-colored lichens that cover the canyon walls.

Bunsen Peak (8564') formed volcanically about 50 million years ago. The peak may be the remains of a volcano that welled up but never blew out, or a small stock that solidified directly beneath a volcano. It is now exposed because erosion has stripped away the lava and volcanic breccia that once completely covered it. The peak was named for Robert Wilhelm von Bunsen, a brilliant German scientist whose name is also attached to the Bunsen Burner you may remember from chemistry. In the 1840s, Bunsen conducted a study of Iceland's geysers and developed a theory on their workings that proved helpful to scientists later studying Yellowstone's geysers.

At the 2-mile mark, you reach the first of Bunsen Peak's three small summits (don't disturb the communication equipment). Beneath you to the west lies Swan Lake Flat and the Gallatin Range. This valley is also known as Gardner's Hole after Johnson Gardner, who trapped beaver here in the 1830s.

From the top of Bunsen you'll discover a panoramic view of the southern end of the magnificent Gallatin Range. From left to right (south to north) the prominent peaks are Mount Holmes (10,336', named for William H. Holmes, artist and geologist for the Hayden surveys of Yellowstone); Antler Peak (10,023'); Quadrant Mountain (9,944'); and Electric Peak (10,992').

Most turn around at the summit, but you can continue over the three small summits and follow a well-marked trail another 2 miles, steeply descending more than 1300 feet down the peak's northeastern slope to a junction with the Bunsen Peak Road. From there, to make it a loop, continue to the right and follow the Bunsen Peak Road Trail another 3 miles back to the Bunsen Trailhead.

Thanks to guidebook author, Tom Carter, for sharing this trail description. To learn more about visiting Yellowstone, check out his book, Day Hiking Yellowstone.

History & Background

Early explorers entering Yellowstone from the north often climbed Bunsen Peak to get their bearings. In 1872, E. S. Topping and Dwight Woodruff, looking south from Bunsen, spotted "an immense column of steam arising." They made their way to it and discovered Norris Geyser Basin.


Shared By:

Tom Carter

Trail Ratings

  4.5 from 23 votes


  4.5 from 23 votes
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104 Views Last Month
3,803 Since Apr 22, 2016



The view from the top on the Bunsen Peak Trail.
Jan 13, 2016 near Mammoth…, WY
Western View of Summit
Jul 8, 2018 near Mammoth…, WY
Rustic Falls. with permission from Juan234
Mar 25, 2016 near Mammoth…, WY
Beaver pond area beneath Bunsen Peak. with permission from Ralph Maughan
Mar 25, 2016 near Mammoth…, WY



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Add Your Check-In


Jul 13, 2021
Daniel Velkov
Jun 28, 2021
Yasmin Palmer
Jun 14, 2021
Brian Severski
Great hike! Aaron and Caroline hiked the whole trail up with no help!! We hit the second summit, as well.
Jun 11, 2021
David Ottney
May 30, 2021
Darby Capellin
Gorgeous view from the top of the surrounding mountains. The trail had just reopened for the season and still had snow piles. 5mi — 2h 46m
May 27, 2021
Tommy Nguyen
Up then down. Top bit with snow. Would go back side and up the scree to avoid snow. Good views of mammoth and swan lake flats — 2h 00m
May 16, 2021
Gretchen Schneider
Sep 21, 2020
Kate C