The trailhead is the Grotto Shuttle stop in the main Zion canyon. During summer months, the Zion shuttle is the only way to access the trailhead.

Approach (2-3 hours)
How is your cardio? This approach will let you find out.

From the trailhead cross the bridge over the Virgin River, and turn right toward the signed Scout Lookout/Angels Landing. The trail begins climbing and makes a few switchbacks before entering Refrigerator Canyon. The cool shade of Refrigerator Canyon is a great respite from the heat in the summer.

A few minute up Refrigerator Canyon, the trail begins climbing again up the right side, soon entering Walter's Wiggles. The Wiggles are a unique section of 21 switchbacks. Zig-Zag up them, reaching Scout Lookout. There is a toilet available at Scout Lookout, but no water.

Continue left on the West Rim trail. It climbs a bit more, passes the head of Refrigerator Canyon, then descends a bit and contours around Mount Majestic before it starts climbing again. Telephone Canyon is visible on the right here. Follow the West Rim trail as it makes a steep ascent up the slickrock slope to a trail junction on top.

Take the signed Telephone Canyon trail on the right. After a few minutes, Telephone Canyon is visible on your right as a shallow canyon. Work down through the scrub oak on game and social trails to the canyon bottom, then down the canyon to the first rappel where the canyon drops quickly.

Canyon

R1 - 46 m ( 151 ft. ) - The big one of the day. All others come in rapid succession.
R2 - 10 m ( 33 ft. )
R3 - 14 m ( 46 ft. )
R4 - 30 m ( 99 ft. ) - This is a low angle drop over a couple of shorter drops.
R5 - 25 m ( 83 ft. ) - Another low angle slot rappel.
R6 - 30 m ( 99 ft. ) - Big views at this rappel anchor as the canyon opens! Rappel down a vertical wall about 20 m ( 66 ft. ), then an additional 10 m ( 33 ft. ) down a low angle slab.
R7 - 10 m ( 33 ft. )
R8 - 4 m ( 14 ft. ) or downclimb
R9 - 4 m ( 14 ft. )
R10 - 12 m ( 40 ft. ) - two stage.
R11 - 8 m ( 27 ft. )
R12 - 7 m ( 23 ft. )
R13 - 7 m ( 23 ft. )
R14 - 6 m ( 20 ft. )
R15 - 6 m ( 20 ft. )
R16 - 20 m ( 66 ft. ) - Phew! The final rappel is down over two stages from the top of an old landslide. From here the canyon opens.

Exit
Continue down the canyon. A few small drops are easily bypassed on the left or right. If you keep an eye out, the West Rim trail is easy to spot when near the base of Mount Majestic. Once close, follow a social trail up to the West Rim trail and return via the West Rim trail.