From the Sunrise Visitors Center take the trail to Frozen lake, at the intersection take the trail up Burroughs Mountain, at the top take the trail for the Sunrise Rim trail. Spectacular views all along the top of this trail.
These trails are usually snow free from late July to early September.
Labor Day weekend hike had Mount Rainier as moody as a teenage girl with the clouds going in out very quickly. Mount Rainier was covered at this point but the light playing on the glacial valley was beautiful revealing the bottom half of the giant Emmons glacier.