What is Pima Canyon Trailhead?
Pima Canyon is where South Mountain meets Ahwatukee, and the trailhead at the end of Pima Canyon Road is the park’s front door for anyone coming from the east. It is a long paved lot with restrooms, drinking fountains and shaded ramadas, and from its upper end a dirt road climbs the wash past a cluster of old stone ranger houses to the National Trail, the spine of the range. That is the route to Hidden Valley, the park’s signature walk: about 6 miles round trip and 850 feet of climbing to a hidden bowl of granite where you squeeze through Fat Man’s Pass, slide down a boulder polished by generations of backsides, and walk out through a Natural Tunnel of stacked rock. Petroglyphs sit beside the trail in places; leave them alone.
The other direction is the Desert Classic Trail, 9 miles one way along the southern foothills with only 270 feet of change, the flattest long trail in the park and a mountain-bike and trail-running favorite. In between are the short ones: the Pima Loop (3.3 miles), the Marcos de Niza Trail (0.9 miles, 310 feet) to a monument marking a 1539 inscription of disputed authenticity, and a couple of wash trails for strollers and small kids.
The park behind it is 16,283 acres and 58 miles of trail, one of the largest city parks in the country, a century old in 2024. What you get at this gate is the most facilities of any South Mountain trailhead and the most routes; what you do not get is a parking space after 8 a.m. on a winter Saturday, or quiet on any weekend at all.
How to hike it right
Pay nothing, beat the gate. Parking and trails are free. The gate opens at 5 a.m. and closes at 7 p.m.; be out or your car spends the night. The lot holds a lot of cars and still fills by eight on cool-season weekends, and there is no legal overflow on the residential streets outside. Be through the gate by 6:30 on a winter weekend or go to the 46th Street lot a mile north, shared by the Javelina Canyon and Beverly Canyon trails.
Get there. Take Scottsdale Road south to Loop 202 west, then I-10 south to the Guadalupe Road exit. Go west on Guadalupe, south on 48th Street, and follow the signs right onto Pima Canyon Road, which winds past a golf course and a few houses to the gate. About 25 minutes from Old Town with no traffic; it is the closest South Mountain trailhead to Scottsdale.
Pick the season and the side. October through April. The route to Hidden Valley is on the north side of the range and gets morning shade, which helps in spring and fall; the Desert Classic faces south and does not. From May through September this is a dawn-only trailhead and the summer rules apply; the city posts heat trail closures on the worst days.
Water. Fountains at the trailhead, nothing beyond. Hidden Valley is deceptively long for a hike that starts at a picnic area; carry two liters per person from April on.
Do Hidden Valley the right way round. Walk the dirt road and the National Trail west past the stone houses, climb to the saddle, take the Mormon Loop right to Fat Man’s Pass, slide down the smooth rock, walk Hidden Valley east through the Natural Tunnel and rejoin National to come home. It is about six miles, and the pass is a tight squeeze with a daypack. The shorter, steeper way to the same place is from the Mormon Trailhead on 24th Street.
Share the trail. Bikes and horses use everything here. The National Trail is a famous technical descent, so listen for riders at the blind corners near the saddle. Bikes are allowed on the Mormon Trail but the city discourages it; most riders comply. Trail runners should go left on the Desert Classic, which is flat, fast and empties out after the first two miles.
Dogs. On leash. Banned on all Phoenix trails at 100 degrees or above, which the city enforces here because the lot is so visible.
Picnic on a weekday. The ramadas near the lot are first-come and busy with birthday parties on Saturdays.
Skip it if you want quiet. For the same mountain with a tenth of the people, start from the Javelina Canyon lot on 46th Street; for the whole park, its roads and Dobbins Lookout, see the South Mountain guide. The Scottsdale equivalent of a staffed, full-service desert gateway is the Gateway Trailhead, which has the advantage of a bigger lot.
The park bought for $17,000 and a hoax carved in stone
The Hohokam climbed this range for a thousand years. Their villages lined the Salt and the Gila on either side of it, their canals ran along its north foot, and they left hundreds of petroglyphs on its granite boulders, some of them beside the trails that leave Pima Canyon. Their descendants, the Akimel O’odham, live on the Gila River Indian Community that begins at the mountain’s south foot, and the Pima of the trailhead’s name are them. The mountain the city calls South Mountain is, to the people who were here first, a place with a longer name and a longer story.
The city’s story begins in 1924. That year the City of Phoenix bought 13,000 acres of the range from the federal government for $17,000, a sale approved under President Coolidge, and named it Phoenix Mountain Park; it became South Mountain Park soon after and marked its centennial in 2024. The land was a bargain because nobody wanted it: too dry to farm, too far from the small city of the time. What made it a park was the Depression. In the early 1930s the Civilian Conservation Corps built the roads, the ramadas, the stone buildings and most of the original trails, and the cluster of stone houses the National Trail passes above Pima Canyon is their work, as is much of the trail itself.
The oddest thing on the mountain is a fraud. On the Marcos de Niza Trail, nine-tenths of a mile from the lot, a boulder carries a Spanish inscription dated 1539 crediting the Franciscan friar’s expedition in search of Cibola, which did pass through Arizona that year with Estevanico as its guide. Landowner Matthew Bellew announced it in the 1920s. Historians called it a fake almost immediately: it refers to “New Mexico,” a name that did not exist in 1539, and credits the friar with paying for the expedition himself, which he did not. Most scholars think de Niza went up the San Pedro, far to the east. In 2012 rock-varnish dating by Ronald Dorn put the carving between the 1850s and the 1920s, and the city keeps the monument anyway, as a historic artifact of a different kind.
The park grew to its present size through bond programs in the 1970s and early 1980s, which pushed it to 16,283 acres and 58 miles of trail, one of the largest municipally managed parks in the country. The same decades built Ahwatukee up to the Pima Canyon fence, which is why this lot, and not the older north-side entrances, became the park’s busiest gate: it is the one a million people on the south side of the Salt can reach in fifteen minutes. The dog ban at 100 degrees, the 7 p.m. lock and the full lot by 8 a.m. are all consequences of that geography.
What is coming is more of the same pressure. The Loop 202 freeway now runs around the mountain’s west end, the Ahwatukee side keeps filling, and the city has no room to add parking at a trailhead hemmed in by houses on one side and a preserve on the other.
Why it matters
Pima Canyon is the clearest place to see how Phoenix got its mountains: a federal land sale in 1924 for less than the price of a car today, Depression labor to build on it, and bond money half a century later to finish the job, all of it on ground the Hohokam and their O’odham descendants knew first. It also holds, in one boulder, the Valley’s best lesson in checking a date before you believe it. The verdict for a Scottsdale hiker: this is the easiest South Mountain gate to reach and the hardest to park at. Go at dawn, do Hidden Valley once, and after that use 46th Street.