Overview
Humphreys Peak is the highest point in Arizona at 12,637 feet, and the trail to the summit is the state's premier mountain hike in Coconino National Forest. The 10-mile out-and-back from the Arizona Snowbowl parking area gains 3,333 feet of elevation, climbing through dense spruce-fir forest before breaking above treeline into alpine tundra that feels more like Colorado than Arizona.
The San Francisco Peaks are a collapsed stratovolcano. Humphreys Peak is the highest remaining rim of the ancient caldera. The volcanic origin means the terrain is steep and the soil is loose pumice and cinder in places. Above treeline, the trail crosses a fragile alpine ecosystem that exists nowhere else in Arizona. The tundra plants here are holdovers from the last ice age, and many are found only on this mountain.
This is a serious mountain hike. The altitude, the exposure above treeline, and the weather can make it genuinely dangerous. Afternoon thunderstorms are common in summer, and being above treeline during a lightning storm is life-threatening. Start early.
The Route
Miles 0 to 2.5: Forest climb. The trail starts at about 9,300 feet in dense Engelmann spruce and corkbark fir forest. The grade is moderate and steady, switchbacking through the trees. This section is shaded and pleasant in the morning.
Miles 2.5 to 3.5: Treeline transition. The forest thins and you begin to get views. Bristlecone pines appear along the trail, gnarled and wind-battered. The terrain becomes rockier and the trees give way to low shrubs and tundra grasses. The treeline here is at about 11,400 feet.
Miles 3.5 to 5: Alpine tundra and summit ridge. Above treeline, the trail follows a ridge of loose volcanic rock and fragile tundra. The path is marked by cairns and is sometimes faint on the rocky ground. Stay on the established trail to protect the alpine plants. The final push to the summit involves a moderately steep scramble on loose cinder and rock. The summit is marked with a benchmark and often a register.
Summit views: On a clear day, the views are extraordinary. To the north, the Grand Canyon's rim is visible. To the northeast, the Painted Desert and Navajo Nation stretch to the horizon. To the south, Sedona's red rocks and the Verde Valley. To the west, the volcanic cinder cones of the San Francisco Volcanic Field.
When to Visit
Late June through September is the standard hiking window. Snow can linger on the upper trail into June, and it returns by late October.
July and August: Monsoon season. Afternoon thunderstorms develop almost daily, typically building between noon and 2 PM. Lightning above treeline is the primary hazard on this hike. Start at sunrise and plan to be below treeline by noon. This is not optional advice.
September and October: The best months. Monsoon storms taper off (though they're still possible), the aspen groves on the lower mountain turn gold, and the crowds thin. First snow at the summit can arrive as early as late September.
Winter: The mountain becomes a serious winter mountaineering objective. Deep snow, extreme wind, and whiteout conditions are common. Not for casual hikers.
What to Bring
- Water: 3 to 4 liters per person. There is no water on the trail. The altitude and dry air cause rapid dehydration.
- Layers: Summit temperatures can be 30 to 40 degrees cooler than Flagstaff, and wind above treeline is common. Bring a warm layer, wind jacket, and hat even on a warm day.
- Rain gear: During monsoon season, carry a rain jacket and be prepared for sudden temperature drops during storms.
- Sun protection: Above treeline, UV exposure is intense. Sunscreen, sunglasses, and a hat are essential.
- Trekking poles: Helpful on the loose, rocky terrain above treeline and for the long descent.
- Headlamp: If you're starting at sunrise (which you should in summer), you'll need light for the first half hour.
Practical Details
Parking: The Humphreys Peak Trailhead shares the Arizona Snowbowl parking area. The lot is paved and free, with about 40 spaces in the hiker lot. It fills on summer weekends by mid-morning. Arrive early.
Dogs: Allowed on leash. The trail is long and the altitude is significant, so make sure your dog is fit for a strenuous mountain hike. Bring water for them. The loose, rocky terrain above treeline can be tough on paws.
Altitude: Starting at 9,300 feet and topping out at 12,637 feet, altitude effects are real. If you're coming from sea level or low elevation, acclimate in Flagstaff (7,000 feet) for at least a day before attempting the summit. Headaches, nausea, and shortness of breath are common above 11,000 feet.
Trail conditions: Well-maintained through the forest section. Above treeline, the trail is rockier and sometimes faint. Follow cairns carefully. The loose volcanic cinder near the summit is tiring to walk on (two steps forward, one step back).
Sacred site: The San Francisco Peaks are sacred to multiple Native American tribes, including the Hopi, Navajo, Havasupai, and others. Please be respectful. Do not disturb any offerings or ceremonial items you may encounter near the summit.
Getting There
From Flagstaff, take US-180 north about 7 miles and turn right onto Snowbowl Road (FR 516). Follow the paved road 7 miles to its end at the Arizona Snowbowl ski area. The trailhead is on the north side of the parking area.
From Sedona, take SR-89A north through Oak Creek Canyon to Flagstaff, then follow US-180 north. Total drive time from Sedona is about 1 hour 15 minutes.
From Phoenix, take I-17 north to Flagstaff (about 2 hours), then follow the directions above. Total drive time is about 2.5 hours.
Beyond the Summit
Experienced hikers sometimes continue from Humphreys Peak along the ridge to Agassiz Peak (12,360 feet), but the ridge traverse is exposed, loose, and not on an established trail. The terrain between the two peaks is fragile alpine tundra. Agassiz Peak itself is within the Snowbowl ski area and the trail to its summit is closed to protect endangered San Francisco Peaks ragwort and the Kachina Peaks Wilderness.
For a less strenuous alternative on the San Francisco Peaks, the Inner Basin Trail starts from Lockett Meadow and climbs through aspen forest to the meadows inside the ancient caldera. It's about 4 miles out-and-back with 1,000 feet of gain, and the fall color in the aspens (typically early to mid-October) is some of the best in Arizona.
Humphreys Peak is a different Arizona. No red rock, no desert, no saguaros. Instead, you get alpine tundra, 50-mile views, and the quiet satisfaction of standing on the highest point in the state. Respect the weather, start at dawn, and practice Leave No Trace on the fragile alpine tundra. Drink more water than you think you need.
Humphreys Peak is the flagship summit in Coconino National Forest, which also encompasses the Sedona red rock country about 50 miles to the south. The contrast is striking: the same forest manages alpine tundra above 12,000 feet and desert slickrock at 4,200 feet. For visitors splitting time between Flagstaff and Sedona, West Fork Trail in Oak Creek Canyon (6.9 miles, easy-moderate) is the top pick for the transition zone between the two environments — shaded, creek-side, and equally beautiful in fall. In Sedona itself, Wilson Mountain (10.4 miles, strenuous) is the best long summit hike accessible from the valley floor, reaching 7,122 feet. Bear Mountain (4.8 miles, strenuous) near Sedona is a shorter but equally demanding objective.
No permit is required for Humphreys Peak, which is the norm across most of Coconino National Forest. The best hikes near Phoenix guide covers the full range of Arizona trails from the Valley through Sedona and up to Flagstaff. Understanding national forest vs. national park land management is worth reading before your visit: the San Francisco Peaks straddle both Coconino National Forest and the Kachina Peaks Wilderness, with different rules in each zone.