U
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- Übungsabfahrt
- Uetliberg's single trails
- UFO Crash Site
- Ullswater Singletrack Loop
- Uløya Traverse
- Umatilla Rim Loop
- Umatilla Rim Out-and-Back
- Umatilla Rim Point-to-Point
- Umbruggler Alm
- Una Moss
- Unc Farm
- Uncle Bill's
- Uncle Jim Trail
- Uncle Jim Trail
- Uncompahgre Peak
- Uncompahgre Peak
- Uncompahgre Peak: South Ridge
- Under Gron chair
- Under-the-Rim Trail
- Unemployment Line Loop
- Uneva Ridge - Low Angle Laps
- Union Meadows BLUE
- Union Meadows GREEN
- Union Meadows ORANGE
- Union Meadows RED
- Union Meadows Uphill
- Union Meadows YELLOW
- Union Peak
- University weather center circuit
- Unmarked connection from 9 to 10
- UnNamable Buttress
- Unteralptal
- Untersberg Panorama Loop
- Updated Featherston WAI2K LEG
- Upheaval Dome Overlooks
- Uphill Access - Bowl Side
- Uphill Access - Ridge Side
- Uphill Access Route 1 from Center Village
- Uphill Access Route 1 from East Village
- Uphill Access Route 2
- Uphill Access Routes 3 and 4
- Upper 110's
- Upper Alta
- Upper and Lower McKinney Falls
- Upper Arrigetch Valley
- Upper Baby Bear
- Upper Boogie
- Upper Broadway
- Upper Buffalo Headwaters
- Upper Caravan Traverse
- Upper Chamonix
- Upper Chillin'
- Upper Coffey's
- Upper Corbly Natural Halfpipe
- Upper Corbly Shade Trees
- Upper Corral
- Upper Creek Falls
- Upper Egan's Woods
- Upper Geyser Basin Trail
- Upper Japanese Flag
- Upper Loop
- Upper Mackenzie Cruise
- Upper Muley Twist Canyon
- Upper Muley Twist Canyon
- Upper Old Lift Line
- Upper Parachute
- Upper Rainbow Falls
- Upper Rattlesnake Canyon Loop
- Upper Rattlesnake Ridge Traverse
- Upper Salmon Lake
- Upper Schöneben Trail
- Upper Sisters Chute
- Upper Spin Trail
- Upper Spring Canyon
- Upper Spring Canyon
- Upper Supreme DH
- Upper Table Rock
- Upper Westside -> Lift
- Upper Westside -> Town
- Upper White Lightning