Take Highway 2 for 1.7 miles east of Skykomish. Turn right (south) onto Foss River Road. Continue on Foss River Road for 3.5 miles and turn left on Forest Service Road #6830. Continue for 6.0 miles to the 310 spur road. Turn right onto the spur and drive 1.0 mile to the trailhead.
The Tonga Ridge trail follows the slope along Tonga Ridge. The slope is covered with fern and blueberry and huckleberry, so colors in the Fall are spectacular and picture opportunities abound along the whole length of the trail. At times the trail winds through fields of berry bushes that nearly glow red in their Fall color.