Rock Climbing · Rifle, CO
Pygmy Mastodon Boner
Before you go
Live · nearest station Glenwood Springs, 23 miGood window today. Daylight to 8:14 pm.
Partly Sunny
Feels like 94°
Wind
5 mph W
UV index
6 high
Sun window
6:18 am to 8:14 pm
Distance
—
Elevation gain
1ft
High point
5,565ft
Season
Jan - Dec
About
Pygmy Mastodon Boner is a difficult sport climbing route located within Skull Cave in Rifle Mountain Park, west of Denver. The climb is graded 5.12b and features limestone walls that are sheltered from direct rain, though seepage can keep the rock wet until mid-summer. The area offers parking and is pet friendly. Climbers typically spend about four hours on the route, which involves varying trail conditions and a strenuous effort. The site is accessible year-round, with peak usage occurring from May through September when the canyon is often crowded. The elevation of the climbing area sits at 5,565 feet.
Trail profile
Gain
1 ft
Avg grade
—
Steepest
—
High point
5,565 ft
Good to know
Parking at the trailhead
Dogs allowed on leash
Waypoints
Latest trail reportgood
Spring climbing conditions. Route may be wet after rainfall. Check weather forecast before climbing.
Reported Mar 3, 2025Verified
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