Just before you get to the town on Detroit, OR from the west on Highway 22 and before you get the big view of Mt. Jefferson, you notice a flat-topped peak on the eastern horizon. Coffin Mountain rises 5770 feet up in the Willamette National Forest just west of Mount Jefferson. The trail to the top is not hard or very long (1000 feet of elevation gain in 1.5 miles), just enough for a nice hike. The peak may look like it has a flat top but it really is just a long ridge with crags on the ends.
At the southern end of the ridge, at 5752 feet is a communications building but at the north end, at the summit, is a working lookout. It is staffed in the summer as a fire lookout and is closed to the public but you can still chat with the staff. You wouldn't notice it much by the hike up through mostly grassy meadows but the northeast side of the summit is a dramatic cliff several hundred feet high. You can sit and dangle your feet off the edge though while you have a bite to eat. Views extend from Adams to Broken Top along the Cascade crest. To the east you can see Detroit Lake as well.
Though not much of a "climb", this one makes for a nice morning or afternoon hike and is great to combine with nearby Bachelor Mountain to get a quick workout in. In early summer, the meadows are filled with flowers. Not far from Iron Mountain and it's unique flora, Coffin Mountain hosts one of the more spectacular displays and it visited by the Native Plant Society of Oregon in mid-June.