Obsidian Cliff
Cliff Cliff of columnar obsidian in Yellowstone
Obsidian Cliff in Yellowstone National Park exposes a band of volcanic glass long used for stone tools; interpretive signs explain its archaeological and geological significance. Visitors view the outcrop from nearby roads and short trails.
Obsidian Cliff is a natural outcrop of volcanic glass in Yellowstone National Park, Wyoming, notable as a source of tool-grade obsidian used by prehistoric peoples. It is recognized for both its geological character and its archaeological importance.
The cliff formed as part of volcanic activity in the Yellowstone region and was quarried by Native American groups for production of stone tools and blades. Material from the outcrop has been chemically fingerprinted and found at distant archaeological sites, showing it was widely traded or transported in prehistory.
Located inside Yellowstone National Park in northwestern Wyoming, near the park road north of the Mammoth Hot Springs area and accessible from the park’s main circulation routes.
- Visitor access: Short interpretive trail and roadside pullout allow close viewing from safe distances and explain its archaeological significance.
- Archaeological importance: Obsidian from the outcrop was widely distributed by prehistoric peoples and has been geochemically traced to sites across North America.
How to Get to Obsidian Cliff #
Obsidian Cliff is accessed from the Mammoth Hot Springs area in Yellowstone National Park. Follow park roads and use designated parking and boardwalks; check the National Park Service website for current road conditions and seasonal closures.
Tips for Visiting Obsidian Cliff #
- Observe all signage and boardwalk rules-Obsidian Cliff is a protected archaeological and geological site.
- Best viewing is from the north side near Mammoth Hot Springs; bring binoculars for detailed inspection.
- The cliff is part of Yellowstone National Park-plan for park entrance fees and seasonal road closures.
Best Time to Visit Obsidian Cliff #
Late spring through early fall is most practical for driving and hiking; winter access is limited and requires guided travel.
Weather & Climate near Obsidian Cliff #
Obsidian Cliff's climate is classified as Subarctic - Subarctic climate with cool summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -17°C to 23°C. Moderate rainfall (636 mm/year).
January
January is the coldest month with highs of -4°C and lows of -17°C. The wettest month with 69 mm of rain.
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February
February is freezing with highs of -1°C and lows of -16°C. Moderate rainfall (52 mm).
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March
March is freezing with highs of 2°C and lows of -13°C. Moderate rainfall (51 mm).
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April
April is freezing with highs of 6°C and lows of -8°C. Moderate rainfall (42 mm).
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May
May is cold with highs of 12°C and lows of -3°C. Moderate rainfall (61 mm).
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June
June is cold with highs of 18°C and lows of 1°C. Moderate rainfall (64 mm).
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July
July is cool with highs of 23°C and lows of 3°C. Moderate rainfall (44 mm).
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August
August is cool with highs of 23°C and lows of 3°C. Moderate rainfall (44 mm).
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September
September is cold with highs of 18°C and lows of -1°C. Moderate rainfall (46 mm).
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October
October is cold with highs of 11°C and lows of -5°C. Moderate rainfall (38 mm).
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November
November is freezing with highs of 1°C and lows of -11°C. Moderate rainfall (57 mm).
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December
December is freezing with highs of -4°C and lows of -16°C. Moderate rainfall (68 mm).
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