Cathedral Lakes are a pair of high-country lakes on the John Muir Trail, above Tuolumne Meadows and beneath Cathedral Peak. This is a destination hike, not a road stop: plan on about 7.6 miles round-trip, 1,000 feet of climbing and six to seven hours to Upper Cathedral Lake. A 0.7-mile spur leads from the route to Lower Lake, so budget that distance both ways if you want to see both. If you only have time for one, Upper is often described as quieter, while Lower is the larger basin with the broader rock shore.