Location and surroundings
Agassiz Peak sits in the San Francisco Peaks, within the wider chain of the North American Cordillera through the Intermountain West, Colorado Plateau, Central Arizona Highlands, and the Flagstaff Area. It is in the United States, in Arizona, and in Coconino County. By elevation it ranks 2nd in Arizona and 2nd among the 28 named peaks of the San Francisco Peaks.
The mountain rises above the high country north of Flagstaff, where open volcanic slopes, ridges, and alpine-like terrain dominate the upper mountain. Its position between Flagstaff and the higher summit to the north makes it a familiar landmark in the range.
Neighbouring peaks
- Fremont Peak — 3,648 m, 1.6 km E
- Humphreys Peak — 3,851 m, 2.3 km N
- San Francisco Mountain — 3,739 m, 2.8 km NE
- Doyle Peak — 3,493 m, 2.9 km E
- Aubineau Peak — 3,608 m, 3.6 km NE
- Rees Peak — 3,497 m, 4.1 km NE
- Schultz Peak — 3,074 m, 4.3 km E
- Fern Mountain — 2,667 m, 6.1 km NW
Humphreys Peak is the nearest higher summit, only 2.3 km to the north. Several other high points of the San Francisco Peaks lie close by, so Agassiz Peak is part of a compact high ridge system rather than an isolated mountain.
The view from the summit
From Agassiz Peak, the highest peaks within 25 km include Kendrick Peak (3,175 m, 18.2 km NW), Elden Mountain (2,834 m, 11.9 km SE), Sugarloaf Peak (2,829 m, 7.1 km NE), Hochderffer Hills (2,792 m, 9.0 km NW), White Horse Hills (2,760 m, 7.5 km N), and Little Elden Mountain (2,749 m, 9.6 km SE). These are the main surrounding high points that shape the skyline around Flagstaff.
The closest giant in the range is Humphreys Peak to the north, which is the dominant summit in the immediate view and the highest point in Arizona.
The range
Agassiz Peak belongs to the San Francisco Peaks, a range of 28 named peaks. The highest peak in the range is Humphreys Peak at 3,851 m, about 2 km north of Agassiz Peak. Within the range, Agassiz Peak ranks 2nd by elevation.
The San Francisco Peaks are part of the high volcanic landscape north of Flagstaff and form one of the most prominent mountain groups on the Colorado Plateau. Agassiz Peak sits just below the range high point, close enough that the two summits are often considered together on the same outing.
Climbing routes
A common approach is from the Arizona Snowbowl area, using the upper ski area access and the Agassiz Peak trail. The route is described as a steep hike or scramble, but access can change with conditions and restrictions. A winter ascent is possible when the summit is snow-covered, and the peak can be combined with Humphreys Peak in a single day.
The usual round trip for the combined outing is about 12 km, with the junction for Agassiz Peak on the saddle between the two summits. Outside winter, access above treeline is restricted because of protection rules for the mountain environment.
Access and starting points
The usual starting town is Flagstaff, Arizona. The approach described in the sources begins at the Ski Bowl area, where parking is available at about 2,800 m. From there, climbers head toward the upper mountain and the saddle between Agassiz Peak and Humphreys Peak.
This is a high-elevation access point, so even the start of the outing is already in mountain terrain. Road and access conditions can vary with season, snow, and land-management restrictions.
Climate and weather
Climate estimates from NASA POWER climate data for 2001–2020 suggest that the summit is cool even in summer. The warmest month is about July, with a mean temperature of about 11 °C, while the coldest is about January, at about -6 °C. Mean temperatures above freezing at the summit are typical from May through October.
Precipitation in the surrounding area is about 350 mm a year. The wettest month is about August with 60 mm, and the driest is about June with 5 mm. Expect rapid weather changes, summer thunderstorms, wind on exposed ridges, and winter snow and ice at high elevation.
Best time to visit
The most comfortable months are usually the ones when summit temperatures are above freezing, especially May to October. Even then, the upper mountain can still be windy and exposed, so early starts and weather checks matter. Summer brings the highest temperatures, but also the main thunderstorm season.
Winter is the period when the peak is open to climbers under the snow-cover rule described for the mountain. Snow can make travel easier on the closed route, but it also adds cold, wind, and avalanche or slip hazards depending on conditions.
Nature and wildlife
Agassiz Peak rises in a high volcanic landscape with open slopes, broken rock, and subalpine to alpine-edge vegetation. The upper mountain is sensitive habitat, which is why access is restricted in the warmer season. Lower down, the surrounding forested slopes and high plateau support typical northern Arizona mountain wildlife.
The peak is part of the Kachina Peaks Wilderness on the Coconino National Forest. The protected status reflects both the mountain setting and the presence of the rare San Francisco Peaks groundsel, a plant tied to the summit area.
Guides and organised ascents
For a high, exposed mountain like Agassiz Peak, a certified guide can be useful if you are unfamiliar with snow travel, route-finding, or changing access rules. In the United States, the national mountain guide association is the American Mountain Guides Association, an IFMGA/UIAGM member. The national alpine club is the American Alpine Club.
Examples of established guiding companies in the country include RMI Expeditions in Ashford, Washington, and Exum Mountain Guides in Moose, Wyoming. In the United States, some peaks require registration or permits from the land agency; for this mountain, access rules are tied to the protected summit area and seasonal restrictions.
Safety and preparation
Agassiz Peak is a high-elevation outing with exposed terrain, cold wind, snow, and route restrictions. Even in summer, the summit environment can be harsh, and in winter snow travel adds extra risk. Good footwear, layers, navigation, and awareness of changing conditions are important.
For emergencies in the United States, the mountain rescue number is 911. Dispatchers alert the local search and rescue team, usually run by the county sheriff or a national park authority. Carry enough water, food, insulation, and a map, and be ready to turn back if weather or access rules change.
History and name
Agassiz Peak is named in honor of Louis Agassiz, the Swiss-born American biologist and geologist. The name reflects the long tradition of naming major western summits after scientists and explorers associated with North American natural history.
The peak has also become known for the frequent confusion with Humphreys Peak, since Agassiz lies between the higher summit and Flagstaff and can block the view of the state high point from town.
Interesting facts
Agassiz Peak is the 2nd highest named peak in the San Francisco Peaks and the 2nd highest named peak in Arizona. Its nearest higher peak is Humphreys Peak, 2.3 km to the north. The summit is also the southernmost mountain peak in the contiguous United States that rises above 3,700 m.
From Flagstaff, Agassiz Peak often hides the higher Humphreys Peak behind it, which is why visitors sometimes mistake the two summits. That visual overlap is one reason the mountain is so well known locally.
FAQ
How high is Agassiz Peak? It rises to 3,766 m in northern Arizona.
Where is Agassiz Peak located? It is in the San Francisco Peaks, north of Flagstaff, in Coconino County, Arizona, United States.
What is the highest peak near Agassiz Peak? Humphreys Peak is the nearest higher summit, 2.3 km to the north, and it is the highest peak in Arizona.
How does Agassiz Peak rank in its range and state? It is 2nd highest in the San Francisco Peaks and 2nd highest among named peaks in Arizona.
Is there water on the way to Agassiz Peak? The upper mountain is dry and exposed, so carry your own water; 1.5-3 litres for a day is a sensible range depending on heat and route length.
Can Agassiz Peak be climbed in summer? The summit route is restricted outside winter because of habitat protection, so access depends on season and current rules.
Will my phone work on Agassiz Peak? Coverage in the hills is patchy and depends on the operator; on open ground it may be better, but ridges and valleys can block signal. Always download maps before setting out, and 112 reaches emergency services over any available network.