Tiger Mountain is a mountain in the U.S. state of Washington. It is at the center of the Issaquah Alps, a small range in the Eastside region of King County, Washington southeast of Seattle. The mountain is part of a designated protected area, the Tiger Mountain State Forest, and has several recreational areas used for hiking, mountain biking, and para…Tiger Mountain is a mountain in the U.S. state of Washington. It is at the center of the Issaquah Alps, a small range in the Eastside region of King County, Washington southeast of Seattle. The mountain is part of a designated protected area, the Tiger Mountain State Forest, and has several recreational areas used for hiking, mountain biking, and paragliding.