Cathedral Lakes Trail is a high-country out-and-back from Tuolumne Meadows Visitor Center to Upper and Lower Cathedral Lakes. To visit both, plan about 9 miles round trip: the main route to Upper Lake is listed at 7.6 miles, and the 0.7-mile one-way Lower Lake spur adds about 1.4 miles for the detour and return. The climb to Upper Lake gains about 1,000 feet. Allow roughly 7–8 hours for both lakes, breaks and shoreline exploring; the 6–7-hour estimate is for the Upper Lake route. For a shorter day, skip Lower Lake and stay on the main route. The trail starts above 8,500 feet, so a steady climb can feel harder than its elevation gain alone suggests.