Distance: 13 miles (21 km) round trip to Ten Lakes; 12 miles (19 km) round trip to Grant Lakes
Trailhead Elevation: 7,520 feet (2,290 meters)
Peak Elevation: 9,640 feet (2,940 meters)
Trailhead-to-Peak Elevation Gain: 2,120 feet (645 meters)
Total Elevation Gain: 2,700 feet (820 meters)
The red line indicates the main trail, with the trailhead at its southern end. I've ended it where it leaves the Ten Lakes area, but the trail proceeds beyond this point, eventually reaching, depending on which forks you choose, May Lake, Tenaya Lake, or Glen Aulin. And since Glen Aulin is an outpost along the Pacific Crest Trail, you could use the Ten Mile Trail as a warmup for a trip to the Canadian or Mexican borders, though at 948 miles (1,525 km) to Mexico and 1,705 miles (2,740 km) to Canada, this would fall outside the boundaries of a day hike for most of us, even before adding in the 14 miles from the Ten Lakes area to Glen Aulin.
The orange line marks the Grant Lakes fork (fork photo here). It's a mile (1.6 km) along this fork to the first Grant Lake.