Denny Mountain, Mountain summit in King County, United States

Denny Mountain is a summit near Snoqualmie Pass in Washington. The Alpental ski area lies on the mountain's eastern flank, while the Snoqualmie Pass Road, later Interstate 90, runs along its southern base.

The peak received its name from Arthur Denny, a pioneer instrumental in establishing the Snoqualmie Pass Road during the region's early development. This route later evolved into part of the modern Interstate 90 highway system that connects communities across the state.

The name comes from Arthur A. Denny of the Denny Party, who oversaw construction of the Snoqualmie Pass Road. That route later became Interstate 90, which runs along the mountain's southern base. The Alpental ski area on the eastern flank keeps the name in daily use among skiers.

Denny Mountain rises just north of Snoqualmie Pass, and Interstate 90 runs along its southern base, so the peak is reached from exit ramps off that highway. The Alpental ski area occupies the eastern flank, and its access road leads to the base area. Winter snow is wet and heavy, and avalanche danger is high on the slopes.

The Alpental ski area sits on Denny Mountain's eastern flank, not its northeastern face. The mountain is named after Arthur A. Denny of the Denny Party, who oversaw construction of the Snoqualmie Pass Road, later part of I-90, running along the southern base.