O'Leary Peak & O'Leary Lookout • San Francisco Volcanic Field
• Coconino County

O'Leary Peak trailhead and mileage information

O'Leary Peak's two summits come into view soon into the hike. The ground is a bedding of cinders.

Higher up, Beth makes her way to the top. Humphreys Peak is in the background

Beth at the Lookout Tower. She made it!

The highpoint of O'Leary Peak, as seen from near the lookout

Darton Dome is a subsidiary peak southeast of O'Leary

Humphreys Peak from the highpoint

The next day we drove onto the National Monument and shot this photo of O'Leary Peak, standing above the Bonito Lava Flow

The amazing Sunset Crater Volcano

Arizona PageMain Page

Prominence Peaks



Date: September 15, 2007 • Elevation: 8,938 feet • Prominence: 1,778 feet • Distance: 10 miles • Time: 5 hours and 30 minutes • Gain: 2,100 feet • Conditions: Slightly cloudy with breezes • Teammates: Beth

O'Leary Peak is north of Flagstaff along US-89 and a couple of miles east from the highway. Its double-summit profile, topped by a lookout tower, is obvious from miles around. It is one of the more prominent peaks in the immediate Flagstaff area, even beating out the local-favorite Mount Elden for second-place honors behind Humphreys Peak. Yet despite all this, the peak seems to hide in plain sight. Hikers coming to Flagstaff with a peak on their minds gravitate toward Humphreys Peak, while locals looking for a workout choose Mount Elden.

O'Leary Peak is close enough to town so that it's reachable within minutes, yet far enough to drop off most people's radar. Apparently the peak can go days between visitors to its summit. Until now, we were in that second category. We had heard of it, of course, and on our drive to the Grand Canyon this past summer, took a good long gaze at it and decided to place it high on our to-do list, when the weather cooled. From below it looks like a wonderful peak.

We left home friday afternoon, planning a weekend in Flagstaff to enjoy the pleasant temperatures and a respite from work and the heat in the deserts. The drive north went fine and we had no trouble, arriving into town at dusk. We got a hotel and settled in. The plan was to awake early and hike the peak on Saturday, then spend the rest of the day watching baseball and eating diner food. From the hotel, we followed US-89 through downtown (and traffic) for about 15 miles to the Sunset Crater Volcano National Monument turn-off. We went right (east) on the secondary road, then left (north) toward the O'Leary Group Camping Area, about a quarter-mile farther.

The trailhead for O'Leary Peak is a few feet past the turn-off, where a gate bars the road from public vehicular access. A small parking area holds about 8 vehicles. When we arrived, all spaces were filled and another 5-6 cars were backed up, parked along the shoulder. We found a spot out of the way and got ready. Had O'Leary suddenly become popular? It was a beautiful Saturday morning so I figured that might explain some of the crowd. As we were getting our shoes on, one of hikers emerged back from his hike, and explained this was all part of a big hiking club. There was one other team of two women who arrived when we did. Other than us and the two ladies, all the other cars evidently were all that one group. We chatted with the guy for a few minutes for information on the route. It was about 10:30 when we started our hike.

The Sunset Crater Volcano is one of Arizona's most interesting geological features: a cinder-cone volcano that erupted in roughly the year 1065, recent enough so that the native peoples still have oral histories that reflect this event. All of the area around Flagstaff is volcanically active, including Humphreys Peak. The Sunset eruption was different in that it started along a fault, then collected into one main cone, which spat cinders and lava over a wide area. A bolus of basaltic lava breached the cone and formed a flow on both sides of the volcano, forming what is today called the Bonito Lava Flow. Meanwhile, the volcano ejected gajillions of little cinder rocks, which collected over the area and coated many of the already-established mountains and hills with cinders, each about the size of a kibble of cat food.

O'Leary is one such peak, predating Sunset Volcano, but still covered over by the cinders. The cinders themselves are little pumice-like stones, mostly about 1/4 to 1/2-inch round, rough to the touch, and very light. Most are colored black or gray but some have brown and red tinting to them, creating interesting mosaics on the hillsides. The forest has been able to re-establish itself on the cinder fields, but there still exist many areas that are essentially cinder deserts. When laying on level ground, the cinders form a solid, soft bedding of rock, which makes for easy hiking. On a steeper slope, they are dreadfully loose and difficult to ascend.

Sunset Crater Volcano National Monument covers about 6 square miles, mostly centered around the main volcanic cone, which rises about 1,000 feet above the terrain. It used to have a trail to the top, but the trail was shut in 1973 to protect against erosion. O'Leary Peak is about three air-miles northwest of the Sunset Crater Volcano. A road switchbacks up to the summit, servicing the lookout tower. The usual route to the top of O'Leary Peak follows this road, which is smoothed over with the countless cinders. A long section of the road fronts the western-extent of the Bonito Lava Flow.

From the gate spanning the road at the parking area, we followed the road east at first, then north and dropped about 40 feet elevation. Within minutes we were walking alongside the lava formations of the Bonito Flow. The flow was about 10-20 feet higher than us, and a few hardy trees had somehow found places to establish roots. Also, we had an open view of O'Leary Peak, which seemed very close already. The lookout tower could be seen on the right-most summit. We were also meeting with many of the hikers from the club, coming down. They had started very early in the morning.

We made good time for the first mile and a half, which is mostly level. The forty-foot elevation drop is offset by a slow and easy gain up the south slope of O'Leary Peak, following the road. We took a break after about 45 minutes of hiking. By now we had left the lava flow behind, although we were still in the cinders. From here to the top was five or six long switchbacks. Beth was feeling pretty good, considering her ankles and knees had been giving her hell for the past few weeks. We had identified the saddle between O'Leary Peak and Darton Dome as a possible goal for Beth in case she could not go to the top.

However, as we hiked up the road, the gradient was slight enough and the cinder footing soft enough so that she was feeling good to go. We stopped for another break about a quarter-mile short of the aforementioned saddle, at which time a lady rumbled down in her truck. She was a lookout worker, up helping the regular O'Leary lookout man move out for the season. We had a friendly conversation with her. She was amazed anyone would want to hike the road. We were enjoying ourselves and having a good break. The weather was getting interesting, with a dry front moving through the region, bring clouds and a stiff wind.

After the lady drove on, we got moving and decided to not stop at the saddle, given that Beth felt fine. So we decided to push on until it felt right again to take another break. At the saddle, the road is gated, but it was easy to get by it and to continue our walk. The road became steeper here as well, and much more exposed to the cliffs. A lot of hefty erosion was taking place along the outer-edge of the road, and in a few places we crossed big rock-slide areas. We also noted, interestingly, a sudden and dramatic change in the nature of the rock. We lost the cinders and came upon regular hardpack dirt and rock, presumably O'Leary Peak's "real" rock.

We took another break at one of the last bends in the road, then worked our way to the top saddle, connecting the summit with the lookout tower to the east with the actual highpoint to the west. The summit with the lookout is 8,916 feet, while the true highpoint is 22 feet higher, at 8,938 feet. From the saddle, the highpoint was about 160 feet higher. Beth immediately lost interest and decided to continue east to the lookout tower. I dropped the pack and said I would run up to the highpoint, then come down and walk up to the lookout to meet her there.

My little side journey up the slopes was short but tiring. For every three steps I went up, I lost two, and sometimes three, sliding back down with the rubble. A few trees and brush patches helped. I followed faint tracks and arrived on top in about 10 minutes, figuring my legs actually climbed 300 feet not counting all the back-sliding. The top was weedy, marked by a cairn and wood tree branch. I signed in and snapped a few photographs. I could see Beth slowly making her way to the lookout summit.

The descent went very fast since the sliding effect was now in my favor, although I got plenty of cinders in my boots. I put on the pack and walked up to meet Beth at the lookout tower. Beth was relaxing on bare rock, enjoying the wind. We stayed there about 15 minutes. The one-way hike had taken us about 3 hours including rest stops, and Beth was exhilirated to have made the entire hike. Given her ailments, it's impossible to tell beforehand whether she'll have a good or bad day hiking until we actually get moving. I was happy, and especially for her.

The hike down went quick, and we had excellent views of Humphreys, Mount Elden, the Sunset Crater Volcano and the eerie landscape of the Bonito Flow. We took breaks and went slow, exiting about 4 p.m. We showered at the hotel and ate at the Galaxy Diner, where we've eaten before many times. We were even treated to a dance-instruction class going on while there. The next day we drove back to the Monument and went to the visitor's center, plus a drive and very short hikes onto the lava for photographs. Then, back home, for a great weekend out of the heat.

A few months later we received a nice email from Ms. Kathy Wood, one of the co-founders of the Irish Arizona Project, who happened upon our page and noted the peak was named for 19th-century mountain man and guide Daniel O'Leary. Below is a small biography of Mr. O'Leary, courtesy Ms. Wood:

Born around 1843 in Ireland, "somewhere on the green banks of the Shannen [sic]." ... A letter from Hardyville, AZ, dated September 29, 1867, and published in the Daily Arizona Miner in Prescott discusses the army of the Colorado battling the Hualapai Indians: "Our worthy townsmen, Geo. Spear and Dan O'Leary go as guides; better and more thorough mountaineers than Kit Carson ever was or will be." ... Served as guide, interpreter, and mountain man for military and other endeavors ... O’Leary Pass and O’Leary Peak are named for him.

Ms. Wood and her co-founder of the Irish Arizona Project, Janice Ryan Bryson, wrote a book about the Irish In Arizona, published by Arcadia Publishing. No photograph of Daniel O'Leary exists, so they asked if they could use our photograph of his eponymous mountain, to which we gladly agreed. It's the photo at left, second down in the sidebar. Sadly, Ms. Wood passed away soon after the book was completed. I never met her, but learning of her passing was sad. We wish the best to her family as well as continued success to the Irish Arizona Project and for her and Ms. Bryson's book.

(c) 2007, 2016 Scott Surgent. For entertainment purposes only. This report is not meant to replace maps, compass, gps and other common sense hiking/navigation items. Neither I nor the webhost can be held responsible for unfortunate situations that may arise based on these trip reports. Conditions (physical and legal) change over time! Some of these hikes are major mountaineering or backpacking endeavors that require skill, proper gear, proper fitness and general experience.