Location and surroundings
Humphreys Peak belongs to the San Francisco Peaks chain in the Flagstaff Area of the Central Arizona Highlands, within the broader Colorado Plateau and Intermountain West of the North American Cordillera. It is in Coconino County, Arizona, and is the highest point in the state. Within its range it is also the highest point of the San Francisco Peaks, which gives it a central place in the local skyline and hiking landscape.
The mountain sits in a high volcanic area above forested slopes and open alpine ground. The summit zone is inside Kachina Peaks Wilderness and Coconino National Forest, so the setting is managed for backcountry travel rather than development. The terrain around the peak is steep, exposed and shaped by volcanic rock, with treeline below the upper ridges.
Neighbouring peaks
Several named peaks rise close to Humphreys Peak, forming a compact high group around the summit. The nearest are:
- Aubineau Peak — 3,608 m, 1.9 km NE
- San Francisco Mountain — 3,739 m, 2.2 km E
- Agassiz Peak — 3,766 m, 2.3 km S
- Rees Peak — 3,497 m, 2.6 km NE
- Fremont Peak — 3,648 m, 3.0 km SE
- Doyle Peak — 3,493 m, 3.4 km SE
- White Horse Hills — 2,760 m, 5.4 km NW
- Schultz Peak — 3,074 m, 5.4 km SE
Humphreys Peak is higher than all of these nearby summits, including Agassiz Peak and San Francisco Mountain. That makes it the main high point in the cluster, with the surrounding peaks forming a ring of lower volcanic summits around it.
The view from the summit
From the summit, the main high points within 25 km are part of the same volcanic landscape and nearby uplands. The most notable are Kendrick Peak to the northwest at 17.1 km, Elden Mountain to the southeast at 13.8 km, and Sugarloaf Peak to the east at 6.0 km. Also within that radius are Hochderffer Hills to the northwest, White Horse Hill to the north, and Little Elden Mountain to the southeast.
These peaks help define the wider horizon around Humphreys Peak, but none of them match its height. The summit view is therefore dominated by the San Francisco Peaks group itself, with lower volcanic hills and ridges spreading outward across the Flagstaff area.
The range
Humphreys Peak is part of the San Francisco Peaks, the highest mountain group in the range hierarchy given for this summit. The range high point is Humphreys Peak itself, so there is no higher summit within the San Francisco Peaks. The group contains 28 named peaks, and Humphreys Peak ranks first by elevation among them.
The San Francisco Peaks are a volcanic mountain group in northern Arizona. In practical terms, Humphreys Peak is the summit that defines the range: it is the state high point, the range high point, and the tallest named peak in the group.
Climbing routes
The standard route is the Humphreys Summit Trail #151, a marked hiking route that reaches the summit area. It is a non-technical mountain hike rather than a climbing route, but conditions can make it demanding because of altitude, steep ground and weather exposure. In winter, snow and ice can change the difficulty significantly.
For most visitors, the ascent is approached as a long day hike from the Humphreys Trailhead area near the Arizona Snowbowl side of the mountain. The route is the usual way to reach the top and is the trail most closely associated with Humphreys Peak.
Access and starting points
The usual starting town is Flagstaff, Arizona, which lies south of the mountain. The summit is also associated with the Arizona Snowbowl area on the western slope, where the main hiking access is commonly used. From there, the trail climbs through forest before reaching the open upper mountain.
Because the peak is close to Flagstaff and reached from the Snowbowl side, it is one of the most accessible high summits in Arizona. Even so, the upper mountain is remote enough that hikers should plan for a full mountain day and changing conditions above treeline.
Climate and weather
These are estimates from NASA POWER climate data, adjusted to summit elevation. At the summit, the warmest month is July at about 11 °C, and the coldest is January at about -6 °C. Mean temperatures above freezing at the summit occur in May, June, July, August, September and October. Around the mountain, annual precipitation is about 350 mm, with August the wettest month at about 60 mm and June the driest at about 5 mm.
The mountain has a high, dry climate with summer monsoon storms, strong sun, wind and rapid weather changes. Lightning is a major hazard on the exposed upper slopes, especially in summer. Snow, ice and blizzard conditions can affect the mountain in colder months, while the steep volcanic terrain adds to exposure in bad weather.
Best time to visit
The months with mean temperatures above freezing at the summit are May through October, which is the main hiking season. In practice, late spring, summer and early autumn are the most workable periods for a summit attempt, with summer bringing the longest days but also the highest chance of thunderstorms and lightning.
For drier conditions, June is the driest month around the mountain, while August is wetter because of the monsoon. Early season snow can linger high on the mountain, and winter travel is a different undertaking altogether. For a normal hike, visitors usually aim for stable weather and an early start.
Nature and wildlife
The mountain rises through forested lower slopes into open, rocky high ground above treeline. The upper mountain is shaped by volcanic rock and exposed ridges, while the lower slopes support mountain forest typical of northern Arizona. Wildlife in this region can include deer, elk, birds of prey and smaller forest animals, with conditions changing quickly as elevation increases.
The summit area lies in Kachina Peaks Wilderness and Coconino National Forest, which helps preserve the natural setting and limits development. The wilderness designation also means visitors should expect a backcountry environment with minimal facilities and a strong emphasis on staying on established routes where required.
Guides and organised ascents
For a hike like Humphreys Peak, a certified guide is usually not necessary in stable summer conditions, but it can be useful for visitors who are new to high-altitude hiking, winter travel or mountain weather. In the United States, the main professional body is the American Mountain Guides Association, an IFMGA/UIAGM member. The national alpine club is the American Alpine Club.
Examples of established guiding companies working in the mountains of the United States include RMI Expeditions and Exum Mountain Guides. Guided trips usually depend on the length of the outing, group size, equipment needs and whether snow travel or extra days are involved. For Humphreys Peak itself, the main practical issue is choosing a guide only if you need help with altitude, route-finding or winter conditions.
Safety and preparation
Humphreys Peak is a high-altitude hike with steep ground, thin air and exposed upper slopes. Hikers should be prepared for rapid weather changes, strong sun, cold wind and lightning, especially in summer. In winter, snow and ice can make the route much more serious, and avalanche or blizzard conditions may affect travel on the mountain.
The emergency number in the United States is 911. It connects to general emergency services, which can alert local search and rescue. Good footwear, layered clothing, navigation tools and enough water are important, and visitors should start early to reduce exposure to afternoon storms.
History and name
The mountain was named around 1870 for General Andrew A. Humphreys, a Union officer who later became Chief of Engineers of the United States Army Corps of Engineers. The name has also appeared in variant forms such as San Francisco Peak on older maps, and the naming history was later regularised by the United States Board on Geographic Names.
Indigenous names are also associated with the mountain, including the Hopi name Aaloosaktukwi and the Navajo name Dookʼoʼoosłííd, which is commonly explained as meaning that its summit never melts. That reflects the mountain’s long cultural importance as well as its physical prominence in northern Arizona.
Interesting facts
Humphreys Peak is the highest point in Arizona and the highest point of the San Francisco Peaks. It is also the highest of 28 named peaks in the range. With an elevation of 3,851 m and a prominence of 1,831 m, it is one of the most significant summits in the state.
The mountain is a dormant volcano in the San Francisco Volcanic Field, and its eastern side was shaped by a major collapse that left the open bowl-like form seen today. Before that event, the volcano may have been much higher. Small glaciers also carved narrow valleys below the summit during the ice ages.
FAQ
How high is Humphreys Peak? It rises to 3,851 m, making it the highest mountain in Arizona and the highest point of the San Francisco Peaks.
Where is Humphreys Peak? It is in Coconino County, Arizona, north of Flagstaff in the United States, within the Coconino National Forest and Kachina Peaks Wilderness.
What range is Humphreys Peak part of? It belongs to the San Francisco Peaks, which are part of the wider North American Cordillera through the Colorado Plateau and Central Arizona Highlands.
What are the nearest peaks? The closest named summits are Aubineau Peak, San Francisco Mountain, Agassiz Peak, Rees Peak, Fremont Peak, Doyle Peak, White Horse Hills and Schultz Peak, all within about 5.4 km.
Is there water on the way to Humphreys Peak? Yes, springs are mapped near the summit area, including Philomena Spring to the northwest, Beard Spring to the east and Flagstaff Spring to the southeast. Even so, carry enough water for a long high-altitude hike, about 1.5 to 3 litres for a day depending on heat and effort.
How long does it take to hike Humphreys Peak? The usual hike on the Humphreys Peak Trail from the Humphreys Trailhead is about 9 miles round trip with roughly 3,400 ft of gain, and is commonly done in about 6 to 8 hours.
Is mobile phone coverage reliable? Coverage is not guaranteed. There is one mapped communication mast within 10 km, about 9.5 km to the northeast, so signal may be possible on open ground but can fail in valleys and behind ridges. 112 reaches emergency services over any available network, and maps should be downloaded before setting out.