Heading north out of Moab about a mile, and turn right on Highway 128. Go up Highway 128 about 3 miles to the obvious and signed Grandstaff trailhead on the right. The trailhead has a large paved parking area and outhouse.

Follow the well-established trail up Grandstaff Canyon. The trail stays on the east side of the stream for 20 or so minutes before beginning quite a few crossings. Most of the crossing have strategically placed rocks in the stream; you are unlikely to get your feet wet.

Shortly after the first crossing, a side canyon comes in on the right and is not the Morning Glory Arch side canyon. Keep going up Grandstaff Canyon. At about 45 minutes, the canyon comes to a pretty distinct Y. The main trail has a faint side trail leaving here on the left, with the main trail dropping to the stream, crossing the stream, and heading up the right side canyon to Morning Glory Arch. Expect about 60 or so minutes from the trailhead to Morning Glory Arch.

A less traveled diversion

If you're motivated, or looking for a less traveled diversion, you can take the faint left-hand trail mentioned above before heading up the Morning Glory Arch side canyon. This faint trail continues up Grandstaff Canyon, and is less traveled than the lower sections of the canyon.

The canyon is less impressive above the junction to Morning Glory Arch, but still pretty and worth the hike. The trail in this section stays more on benches, away from the water, so can be hot in summer. Return the way you came as energy dictates.