Hiking O'Leary Peak in Flagstaff, Arizona

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A DayHike to the O'Leary Lookout : 360-Degree Views of Northern Arizona

Located 20 miles north of Flagstaff is an old volcano known as O'Leary Peak. On top of O'Leary, on it's 8,916-foot east summit, is a fire lookout, currently used by the U.S. Forest Service.

On a clear day, which describes many days here in northern Arizona, you can see all the way to the Grand Canyon and Painted Desert from the O'Leary's summit. You'll also have excellent views of old lava flows, Sunset Crater and the San Francisco peaks, and ponderosa pine forest as far as the eye can see.

O'Leary Peak is a lengthy day hike, but I consider it only moderately strenuous due to the easy grade of the closed and gated Forest Service road that switchbacks to the top. What makes it more difficult for some folks is the elevation of Flagstaff (the city is at 7,000 feet) if they're visiting from somewhere much closer to sea level.

Round-trip distance: 10.2 miles
Elevation gain for this hike: 1996 feet
Dogs and horses permitted

Directions to the O'Leary Lookout Trailhead

O'Leary Peak, Flagstaff, ArizonaFrom Flagstaff, take US 89 north, past the Flagstaff mall, Townsend-Winona Rd and Silver Saddle Rd.

Turn right on the road to Sunset Crater National Park.

Just before entering the park, take a left on Forest Service Rd 545A. You'll see the entrance to Bonito Campground on the left but continue ahead for O'Leary Peak trailhead parking.

Go about 1/4 of a mile to the parking area just before the gate where the pavement ends.

Visit the Coconino National Forest O'Leary Peak page.

Hike Along Sunset Crater's Lava Flow

It's called the Bonito Lava Flow

Lava flow along OLeary Peak trail

The first (and therefore last) couple of miles of the O'Leary Peak hike take you alongside the Bonito Lava flow, which occurred about 900 years ago when Sunset Crater was formed. Take a few minutes to veer off the trail and check out the sharp and brittle black lava. Imagine trying to walk on that stuff? It would tear up your shoes in no time, not to mention your skin if ... or more likely when ... you'd have to use your hands or even fall.

The whole area, including O'Leary Peak, was blanketed with lava and cinders during a series of eruptions sometime between A.D. 1040 and 1100.

Bonito Lava Flow Field, Sunset Crater Volcano National Monument, Flagstaff, Arizona

Bonito Lava Flow Field, Sunset Crater Volcano National Monument, Flagstaff, AZ
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More information about Sunset Crater and Flagstaff volcanoes:

View of Old Lava Flow from Partway Up O'Leary Peak

You really get a feel for all the volcanic activity that took place here as you ascend and look around.

View of lava field from O'Leary Peak

Looking at Sunset Crater from O'Leary Peak

You can see right down into the bowl.

Sunset Crater from O'Leary Peak

Wildflowers on O'Leary

Wildflowers on O'Leary Peak

Getting Up There...

O'Leary Peak Lookout Trail

Erosion Control Just Before The O'Leary Peak Lookout

East Summit

Erosion control near the O'Leary summit

You hike on this metal grating to get to the fire tower.

On the O'Leary Fire Lookout Tower

If the tower is occupied, chances are the ranger will invite you up.

On the O'Leary Fire Tower

A View of Northern Arizona from the O'Leary Lookout Tower

View of Northern Arizona from O'Leary Peak

Our hiking group at the summit, in front of the fire Tower

A Guide To Flagstaff Area Hikes

Flagstaff Hikes, Revised 6th Edition; 97 Day Hikes around Flagstaff, Arizona

Amazon Price: $15.23 (as of 06/02/2012)Buy Now
Used Price: $10.95

The 97 hikes in this edition have been updated to include GPS coordinates. The very user-friendly format features each hike shown on opposite pages with directions to the trailhead, a description of the hike, and a color photograph and map. Also included is an elevation change graph, season-to-hike chart, difficulty/mileage graph and how-crowded icon. First released in 1992, the authors have kept this guide continuously updated and current through this latest edition.

Take an Armchair Hike Up O'Leary Peak

A series of three videos from the trailhead to the summit and back

FYI--I didn't shoot these videos.
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Going Up!

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Descending from the Fire Tower to the Trailhead

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  • RenaissanceWoman2010 Aug 20, 2011 @ 3:23 pm | delete
    I like how you incorporated multimedia clips and music into this lens as well as photos and trail descriptions. In terms of my favorite hike, it is usually whichever one I am on at the moment. A beautiful place to hike in Colorado Springs is Garden of the Gods.
  • Jean Aug 8, 2011 @ 11:47 pm | delete
    I was the lookout on duty that day. How interesting to see your view of the hike. Interesting choice of music...I'll hear it when I climb the stairs again, I'm sure. I appreciate your discretion in not posting me or my quarters online.
  • RinchenChodron Aug 7, 2011 @ 1:24 pm | delete
    I like hiking around Crestone Peak in Colorado. I love your photos! Nice lens.
  • Rafick Aug 7, 2011 @ 2:14 am | delete
    My favorite hiking places are in New Zealand and the Himalayas, but this looks great too. Rafick
  • PaulOnBooks Aug 5, 2011 @ 5:43 am | delete
    Hiking O'Leary Peak sounds good. Nicely described.

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Flagstaff Hiking Guides 

Best Easy Day Hikes Flagstaff, 2nd (Best Easy Day Hikes Series)

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Flagstaff Hikes, Revised 6th Edition; 97 Day Hikes around Flagstaff, Arizona

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