The Tahosa Valley is located in northern Colorado between two sections of Rocky Mountain National Park. The west side lies below Longs Peak and the east side lies below the Twin Sisters. The Tahosa Valley is located on both sides of Colorado State Highway 7 between the Wind River Pass on the north and the North St. Vrain River on the south. The northern portion of the Tahosa Valley is in Larimer County and the southern portion is in Boulder County.
Geologically, the Tahosa Valley was filled with glacial ice during the Ice Ages. Consequently, glacial moraines and other glacial remnants dominate the surface of the valley. Wind River Pass at the north end lies at an altitude of 9150 feet. SH7 crosses the North St. Vrain River at an altitude of about 8000 feet. Tahosa Creek flow from the Wind River Pass area down to Cabin Creek in the Meeker Park area. From that junction down to the confluence with the North St. Vrain is shown as Cow Creek on various area maps.
Two towns dominate the economic activity in the area. The Town of Estes Park north of the Tahosa Valley is a gateway to Rocky Mountain National Park. The Tahosa Valley contains the Trail Head for the climb of Longs Peak. The Trail Head for the climb of the Twin Sisters is now near Lily Lake just to the north of the Wind River Pass. Allenspark is an unincorporated village in Boulder County just to the south of the Tahosa Valley.
Tahosa Valley in May Snow