Fossil Springs Trail Arizona: Canyon Hike to 20,000 GPM Springs
Fossil Springs Trail Arizona guide: 8-mile round trip with 1,500-ft descent to year-round turquoise springs, permit requirements, seasonal closure dates, and safety tips
HikeDesert Team
Last hiked: 2026-01-22
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Twenty thousand gallons per minute is worth stopping on. That’s roughly the discharge rate of Fossil Springs, a series of natural seeps and vents at the bottom of a 1,500-foot canyon in the Mazatzal Wilderness. It’s not a trickle or a seasonal flow. It’s a constant river emerging from solid rock in the middle of the Arizona desert, fed by groundwater that entered the limestone 5,000 years ago.
Getting to it requires a 1,500-foot descent, a 4-mile walk, and a high-clearance vehicle. Getting back out requires the same 1,500 feet in the opposite direction. That return climb is what makes this hike strenuous. The descent is easy enough to lull you into thinking the whole day will be easy. It won’t be.
Trail Overview
The Fossil Springs Trail (Bob Bear Trail) descends 4 miles from the Bob Bear Trailhead at 5,700 feet to Fossil Springs at approximately 4,200 feet. The round trip is 8 miles with a 1,500-foot elevation change in both directions.
The hard part isn’t the distance. It’s the direction. You spend 2 hours walking downhill to the springs, rest and swim, then spend 2 to 2.5 hours climbing out. The climb is entirely on exposed, shadeless chaparral terrain. Timing matters more on this trail than almost any other in the Flagstaff region.
Difficulty: strenuous. The descent is moderate for a fit hiker. The return climb is strenuous for anyone.
The Fossil Springs canyon was designated a Wild and Scenic River in 2009, protecting 11.6 miles of the creek corridor. No mechanized vehicles, no drones, no camping within a quarter mile of the springs without a permit.
Season: October through May for general hiking. The trail is completely closed June 1 through September 30. This is a Forest Service closure, not a suggestion. Ranger-led rescues in this canyon during summer heat were the reason the closure became mandatory. Don’t try to hike it in summer.
Permits required April 1 through May 31: $6 per person per day via recreation.gov. October through March: no permit, no fee.
Getting There
Bob Bear Trailhead is the primary access point. The address you want for navigation is “Fossil Creek Road, Strawberry, AZ 85544.” The route from Flagstaff:
Take I-17 south from Flagstaff approximately 35 miles to Exit 287 (Strawberry/Pine). Head west on AZ-260 for 4 miles to Strawberry. In Strawberry, turn south on FR 708. This is where the road conditions change.
FR 708 runs 5 miles south from Strawberry to the trailhead. The first mile is manageable. The last 4 miles are rocky, rutted, and rough. You need a vehicle with at least 8 inches of ground clearance to avoid scraping and bottoming out. Trucks, SUVs, and Jeeps handle it fine. Sedans, minivans, and low-profile crossovers don’t. Don’t attempt FR 708 in a standard rental car.
After rain, FR 708 is impassable for any vehicle. Call the Tonto National Forest Payson Ranger District at (928) 474-7900 for current road conditions before making the drive.
From Phoenix, the drive is I-17 north to the Cordes Junction area, then the same route as Flagstaff but in reverse: AZ-87 north through Payson, then AZ-260 east to Strawberry, then FR 708 south. About 2 hours from the Phoenix metro core.
Fill gas and water in Payson or Strawberry. The trailhead has no facilities.
Parking at the trailhead is a dirt area with room for about 15 vehicles. On April and May weekends, it can fill by 8am. On permit days, only the number of vehicles corresponding to issued permits should be present, but this isn’t always enforced at the lot level.
Trail Description
Miles 0-1: Descent Through Chaparral
The trail leaves the trailhead and drops immediately. No warm-up. The grade is consistent and the footing is loose in sections, a mix of rocky singletrack and sandy trail.
The vegetation here is chaparral, dense manzanita, scrub oak, and mountain mahogany. It’s not tall enough to provide shade. The trail is exposed from the first step. In October and November, this section is comfortable at 60 to 70°F. In late March and April, it can be warm even in the morning.
The first mile offers views ahead into the canyon. You can see the canyon walls but not the bottom. The trail winds south and west, occasionally through rocky passages where you use your hands for balance on a step or two.
Miles 1-3: Steeper Descent, Canyon Walls Emerge
The grade steepens in the second mile. The canyon walls rise above you on both sides, pinkish-gray limestone banding visible in the rock faces. The chaparral starts to mix with riparian vegetation, cottonwood and willow, visible below even though you’re still 1,000 feet above the canyon floor.
Footing is roughest in this section. Loose rocks on a descending grade are harder on ankles than ascending the same terrain. Trekking poles help considerably here.
At about mile 2.5, the trail makes a sharp switchback descent through a rocky section that requires careful footing. This is the steepest part of the trail, around 400 feet of descent in a half mile. Take it slow. This section is much harder on tired legs coming back up.
Miles 3-4: Canyon Floor and the Springs
The trail flattens as you near the canyon bottom. Cottonwood trees appear, their canopy providing the first real shade of the hike.
The springs announce themselves before you reach them. The canyon floor goes from dry rock to wet rock to running water within a few hundred yards. The spring water emerges from multiple points along the base of the canyon wall, some as visible seeps weeping from the rock face, others as upwellings in the creek bed that you feel as cold spots underfoot.
The water is instantly, visibly different from anything in the creek above it. Clear and turquoise-tinged from dissolved limestone, 70°F regardless of air temperature. In November, when the air is 55°F and you’re cold from the descent, the spring water feels warm. In April when it’s 80°F on the trail above, the same water feels cold.
The main pool at the spring emergence is several feet deep. The creek below the springs runs fast and clear. There are multiple places to sit on the rock ledges and get in the water.
Tufa formations appear around the spring vents, pale spongy calcium carbonate rock that builds up where spring water meets air. These are the “fossil” deposits the trail name references.
What to Bring
Carry 3 liters of water minimum per person, regardless of the springs at the bottom. Do not count on the spring water as your only supply. You need water for the descent, water at the springs, and water for the 2-hour return climb. Three liters is the minimum. Four is better.
The spring water at the source is considered safe to drink without treatment, unlike the creek water above the springs (ranching operations upstream of the trailhead affect water quality above the spring emergence point). But filter or treat it anyway.
Trekking poles are strongly recommended. The descent and return climb are both loose and steep enough to make poles a meaningful safety item, not just a comfort item. Borrow or rent a pair if you don’t own them.
Sun protection for the full exposed hike. There’s no shade from the trailhead to the canyon bottom except the last quarter mile of approach to the springs. A sun hoodie, hat, and sunscreen matter for both descent and return.
Water shoes or sandals for the spring area. The rock around the springs is slippery and the pools have rocky bottoms. Bring something you can get wet.
A light layer for the descent. Morning temperatures in the canyon can be 20 degrees cooler than Flagstaff or Strawberry even in spring.
Safety Notes
The return climb is the primary hazard on this trail. The pattern of incidents in Fossil Creek canyon follows a predictable shape: hikers underestimate the return climb, stay too long at the springs, and attempt the ascent in afternoon heat with low water. The result is heat exhaustion on the exposed trail above the canyon, where rescue helicopter access is limited.
The rule is simple. Start climbing back before 11am from October through March. Before 9am in April and May. If you reach the springs at 9:30am in November, you have 90 minutes at the bottom before you need to start back. That’s enough time to swim and eat. It’s not enough time to take a long nap.
Do not bring less than 3 liters of water per person. Many past rescue calls in this canyon involved hikers who planned to drink spring water and didn’t carry enough for the return. Carry your water.
For any medical emergency in this canyon, call 911 immediately. Helicopter landing zones in Fossil Creek canyon are limited. Ground rescue response time from Strawberry is significant. Tell someone your plan and expected return time before you go.
Flash flood risk in the canyon during July through September monsoon season is another reason the summer closure exists. The Fossil Creek watershed is large, and storms anywhere in it can produce rapid flooding at the spring level.
Related Trails
The West Clear Creek Trail is the closest comparable experience in the Flagstaff region. It’s longer, wilder, and requires overnight gear for the full route, but the clear-water canyon environment is similar to Fossil Springs. If you do Fossil Springs in fall and want more canyon hiking, West Clear Creek is the next step.
The Elden Lookout Trail near Flagstaff is a good complementary hike for the same trip. Flagstaff is about an hour from Strawberry. Spending one day on the ridge above Flagstaff and one day in Fossil Creek canyon gives you two completely different terrain experiences without moving your base camp.
Frequently Asked Questions
Do I need a permit for Fossil Springs Trail?
It depends on the date. From April 1 through May 31, a permit is required at $6 per person per day, booked through recreation.gov. Spring permits sell out weeks in advance for weekend dates. June 1 through September 30, the trail is completely closed due to extreme heat and safety concerns. October 1 through March 31, no permit is required and the trail is free. If you're planning a spring trip, book your permit as early as recreation.gov allows. Weekend permits in April and May are competitive.
How hard is the climb out of Fossil Springs Canyon?
It's the hardest part of the hike and the one most hikers underestimate. The descent takes about 1.5 to 2 hours and feels easy. Then you swim, eat, and rest at the springs. The 1,500-foot climb back on loose, exposed trail in the afternoon heat is where people get into trouble. Budget at least 2 to 2.5 hours for the return climb. Start your ascent no later than 11am in October through March. If you leave the springs at 11am in early November, you'll reach the trailhead by 1:30pm with some energy left. If you leave at 2pm, you're climbing in direct afternoon sun with tired legs.
Can you swim at Fossil Springs?
Yes. The spring pools are swimmable and one of the main reasons people make this hike. The water emerges at a constant 70°F year-round, which is cold enough to be refreshing in October and November but cool enough to cause cold shock if you jump in. The main spring pool is several feet deep. The turquoise color comes from dissolved limestone minerals in the spring water. Bring water shoes for the rocky spring area.
Is a high-clearance vehicle required for Fossil Springs Trailhead?
Yes. The last 5 miles of FR 708 from Strawberry require a high-clearance vehicle. Standard sedans regularly get stuck or damage their undercarriage on this road. An SUV or truck with at least 8 inches of ground clearance handles it fine in dry conditions. Do not attempt FR 708 after rain. The road turns to mud and becomes impassable for all vehicles, high-clearance included.
What wildlife might I see at Fossil Springs?
The springs are a permanent water source in a desert canyon, which concentrates wildlife. Mule deer are common near the springs, especially in morning. Great blue herons hunt the creek. Ringtail cats are present but rarely seen, you're more likely to see tracks than the animal. From October through March, the canyon also has a healthy population of gray fox. Rattlesnakes are present from spring through fall, though the cool canyon floor is less active snake habitat than the open chaparral above.
What is the geology behind Fossil Springs?
The springs discharge from the base of the Mogollon Rim, where porous limestone and volcanic rock formations collect precipitation from a broad recharge area that extends north toward Flagstaff. The water takes an estimated 5,000 to 10,000 years to move through the limestone before reaching the surface. The "fossil" in the name refers to the tufa deposits, a limestone rock that forms where calcium-rich spring water meets air. You'll see the pale, spongy tufa formations around the spring emergence points.
HikeDesert Team
Last hiked: 2026-01-22