Roberts Horn is a sub-peak of Mount Timpanogos that is not too difficult to access. The summit offers interesting views of Timp's east face and of the Timp Glacier. The best route to climb Roberts Horn is from the popular Aspen Grove trail.
Following the Aspen Grove trail for 4.5 miles and 3,510 feet will put you at scenic Emerald Lake. You'll have a good view of the slopes of Robert's Horn above you most of the way up to the lake. From the lake you'll see the peak to your northeast, about 600 feet higher. The best way to get to the summit is follow the trail headed for the summit of Timpanogos as it reaches the edge of Timpanogos Basin. From here a ridge extends east to Roberts Horn.
Climbing the 600 feet to the summit is pretty easy bouldering, and spots will have a faint trail. The views along the way are spectacular in all directions. The summit offers a chance to look directly down Aspen Grove at the trail you hiked up. You'll see why Timpanogos' slopes are among the most avalanche prone in the wasatch range. The 1,400 foot east face of Timp looms in the distance above Emerald Lake. I climbed Roberts Horn on Labor Day of 1998 which was a mistake as the trail was like walking on a busy city street. However, I was all to myself on this peak while everyone else headed for the main Timpanogos peak. I climbed up more of the south face of Roberts Horn, which wasn't too difficult but had a lot of loose rock. I followed the west ridge down, and found it to have a slight trail and in general, much more enjoyable walking.
An ascent of Roberts Horn is a climb of 4,150 feet and about 10 miles plus of hiking. It can be done typically in 6 to 8 hours. The hike up Aspen Grove is among the most popular and the most scenic in Utah. See the trip report for Mount Timpanogos for more information and pictures regarding that hike. Snow covers this trail well into summer. More difficult routes exist on Roberts Horn. For more information consult Kelsey's hiking book for Mount Timpanogos.