Humphreys Peak Trail
Flagstaff · Very Hard
The Humphreys Peak Trail is a very hard hike in Flagstaff, Arizona: 10.5 miles round trip with 3,333 ft of elevation gain, typically completed in 7-10 hours. Dogs are allowed. No entry fee. Best hiked July through October (snow-free).
About Humphreys Peak Trail
Humphreys Peak is the highest point in Arizona at 12,633 feet, and standing on its summit is a bucket-list experience for hikers across the Southwest. The trail begins at the Arizona Snowbowl ski area at approximately 9,300 feet and climbs relentlessly through dense spruce-fir forest before emerging above treeline into a stark, windswept alpine landscape unlike anything else in the state. The first three miles wind through a beautiful subalpine forest of Engelmann spruce, corkbark fir, and bristlecone pine.
The trail surface is well-maintained with moderate grades, and the forest canopy provides welcome shade. Wildflowers bloom along the understory in July and August, adding splashes of color to the green corridor. Around mile three, the trees begin to thin and you enter the alpine tundra zone, one of only a handful of such ecosystems in Arizona.
This fragile environment supports rare plant species found nowhere else in the state, so staying on the marked trail is critical. The final two miles above treeline are the most challenging section. The trail crosses exposed scree fields and loose volcanic rock, and the thin air at this altitude makes every step feel twice as hard.
Altitude sickness is a genuine concern for hikers coming from lower elevations. Headaches, nausea, and dizziness are common symptoms. If you feel seriously unwell, descend immediately.
The summit itself is a broad, rocky plateau with jaw-dropping views in every direction. On clear days, you can see the Grand Canyon to the north, the Painted Desert to the east, and the San Francisco Peaks volcanic field spreading out below you. The sense of accomplishment is immense.
Weather is the primary safety concern on Humphreys Peak. Afternoon thunderstorms are extremely common from July through mid-September, and being above treeline during a lightning storm is genuinely life-threatening. Start your hike at first light, aim to reach the summit by late morning, and be back below treeline before noon.
Do not take this warning lightly. The mountain generates its own weather systems and storms can build with startling speed. Bring layers for all conditions, as temperatures at the summit can be 30 to 40 degrees cooler than in Flagstaff.
Wind chill at the top can be brutal even in summer. Dogs are allowed on leash, but the rough volcanic rock above treeline is extremely hard on paws. Carry at least three liters of water per person.
There is no fee to hike, but the Snowbowl parking lot can fill on popular summer weekends.
Getting There
Trailhead Address: Snowbowl Rd, Flagstaff, AZ 86001 (Arizona Snowbowl parking area)
Best Time to Hike
Best Season: July through October (snow-free)
For the most comfortable experience on Humphreys Peak Trail, plan your hike during the recommended season. In the warmer months, start early in the morning to avoid peak heat, especially on exposed desert trails. Always check current weather conditions and trail status before heading out.
What to Bring
Based on the very hard difficulty rating and Flagstaff location, here is a recommended packing list for this hike:
- Plenty of water (at least 1 liter per hour of hiking)
- Sun protection: hat, sunglasses, and sunscreen (SPF 50+)
- Sturdy hiking shoes or boots with good traction
- Trail snacks and energy bars
- First aid kit with blister care supplies
- Fully charged phone with downloaded trail map
- Trekking poles for steep terrain
- Extra layers for elevation changes
- Headlamp in case of delayed return
- Emergency whistle and signaling mirror
- Warm mid-layer (temperatures drop at elevation)
- Rain jacket (afternoon storms are common in summer)