What is Estrella Mountain Regional Park?
South of the Gila River, past the last of Goodyear’s subdivisions, the ground tilts up toward the dark, broken ridge of the Sierra Estrella, and the county owns the first 19,840 acres of that tilt. Estrella Mountain Regional Park began in 1953 as an 828-acre community park built by West Valley residents and became the county’s first regional park the next year; the Gila River Indian Community’s land begins at the ridgeline above it. It is the second-largest park in the county, and the least visited of the big ones for the simple reason that it is 45 minutes from almost everybody.
The trails are the point. About 58 miles of them, nearly all multi-use, from the half-mile barrier-free Gila loop and the 2.6-mile Baseline near the picnic ground to a ring of longer routes in the foothills: Gadsden (6.5 miles), Rainbow Valley (4.2), Toothaker (4.1), Coldwater (2.9) and the 8.4-mile Pedersen, which goes farther into the range than most people care to. Mountain bikers have a competitive track with a 9.5-mile Long Loop, a rockier 4.8-mile Technical Loop and a 1.6-mile Junior Loop. Horse people have a staging area and more riders than any county park but McDowell.
Then there is the lawn. Estrella has the only grass picnic area in the county system, 65 acres of turf and old eucalyptus with more than twenty reservable ramadas, grills, a playground and a paved one-mile loop. On a March Sunday it is full of quinceañera photos and soccer balls, which is a kind of park Scottsdale does not have. What you get is space, quiet trails and shade on grass. What you do not get, until 2027, is a campground, and in 2026 you also do not get two of the trailheads or several of the ramadas.
How to do Estrella right
Pay at the gate. $10 per vehicle in 2026 and 2027, $12 from 2028; $5 per walk-in or cyclist. The $120 county annual pass covers this and every other Maricopa County regional park, including McDowell Mountain and White Tank. Ramadas reserve online; nothing else needs a booking.
Get there. Loop 101 south to I-10 west, about 30 miles across the Valley to Estrella Parkway, exit south for three miles to Vineyard Avenue, then east a short distance to the entrance on the south side. Figure 50 minutes from Old Town with no traffic, and do not attempt it westbound at 5 p.m. on a weekday. All paved. Inside, a loop road reaches the picnic ground, the nature center and the Arena and Amphitheater trailheads; the Rainbow Valley and Coldwater trailheads are behind construction fencing through March 2027, and 143rd Drive and Arena Drive are closed for the work.
Pick the season. October through April for the loops. The park sits at about 1,000 feet, lower and hotter than Scottsdale, and the long trails are a bad idea after nine from May to September. Monsoon storms off the Estrellas are violent; the August 17, 2026 storm wrecked ramadas and the playground. Read the monsoon field manual before a late-summer visit.
Water. Drinking water and flush restrooms at the picnic area and nature center; none on the trails. Pedersen in particular has no bail-out and no shade. Three liters for a full loop in March.
Ride the loop the right way. Start from the Arena or Amphitheater trailheads while Rainbow Valley is closed and do the Gadsden-Rainbow Valley-Toothaker country counterclockwise, so the rocky climb comes early and the long bajada descent faces the mountains. The competitive track is genuinely technical in places and faster than McDowell Mountain’s, which is why the racers like it; bikers should ride the Long Loop first and the Technical Loop second.
Horses. This is one of the best county parks for them, with a staging area at the Arena trailhead and wide multi-use trails. Hikers yield to horses everywhere; step to the downhill side and speak.
Dogs. On a six-foot leash, licensed, welcome on all trails and in the picnic area. The lawn is the best dog picnic in the West Valley.
Skip it if you want the summit rather than the foothills, or birds rather than miles. The top of the range is a different, brutal day from the Quartz Peak trailhead on the far side, and the birding is downstream at Base and Meridian, where the Gila meets the Salt. For a county park with a campground open now, White Tank is 30 minutes north.
The first park in the county system
The Sierra Estrella is the range the Valley forgets because the Gila River Indian Community stands between it and the city. At Spanish contact the mountains were Akimel O’odham country, with Yavapai bands at the north end; the O’odham name is Komadk, and the southern canyons are covered with petroglyphs. The Hohokam, the O’odham’s ancestors, had irrigated the Gila beneath the range for a thousand years before that. The highest point, Hayes Peak at 4,512 feet, is named for Ira Hayes, the Pima Marine from Sacaton who raised the flag on Iwo Jima. Most of the range, including everything above the park’s ridgeline, is reservation land, created in 1859 along the river villages and still the reason there is no road over the Estrellas.
The flats at the mountains’ northern foot became American in 1853 with the Gadsden Purchase, and the Gila below them carried the Butterfield Overland Mail for a few years before the railroad killed the stage. For the next century the land was river bottom, grazing and cotton. Then in 1953 a group of West Valley residents and the county bought the first 828 acres at the foot of the range and built a park on them in the only style anyone then knew, with turf, trees and picnic tables. In 1954 it became Maricopa County’s first regional park, the seed of a system that now runs from Lake Pleasant to San Tan and holds more than 120,000 acres. The lawn and the old eucalyptus date from that beginning, and they are why Estrella is the only county park with grass: every park the county added later was planned as a desert preserve.
Growth came from Washington. The federal government held the bajada above the original park, and through leases and purchases the county pushed the boundary up the slope to 16,468 acres by 1962 and eventually to 19,840. The county built what the era wanted: a golf course on the river side, a rodeo arena in 1981 for roping and rough-stock events, an amphitheater, and a nature center. The trail system came last and grew into the largest in the West Valley, about 58 miles, with the competitive track laid out for mountain bike racing in the years when the sport arrived in Phoenix.
The arena is now the key to the park’s next chapter. When the county updated the park’s master plan in 2016, the public asked for the thing Estrella had never had, a campground, and the decommissioned rodeo ground was the obvious site. Construction began on February 3, 2025: 50 developed sites, two restroom buildings with showers, a dump station, five park-host sites, a fenced equestrian trailhead, a shaded dog area and a rebuilt Rainbow Valley trailhead, with the Rainbow Valley and Coldwater trailheads closed through March 2027 while it is built. The county is also returning 16 acres of the lawn to desert landscaping with 60 trees, 400 native plants and 100 cacti, and reseeding the 4.3-acre core that stays grass. Phoenix Raceway is a few miles away, and the county says plainly that race weekends will fill the new sites.
The park’s one recurring enemy is weather. The storm of August 17, 2026 closed the playground and ramadas 7, 10 and 11, the latest in a series of summer blows off the Estrellas that the county has been slow to repair. When the campground opens in 2027 the park will finally have what the public asked for; whether the ramadas are open that day is a separate question.
Why it matters
Estrella is where the county learned to make parks, and the lawn is the proof: it is what a Maricopa County park looked like in 1954, before anyone thought a preserve should look like the desert it preserves. The 19,000 acres of bajada above it are what the system became. For Scottsdale, which built its own preserve on the same borrowed-federal-land model forty years later, the park is a reminder that the West Valley got there first and did it with volunteers. The practical verdict: go for the long, empty loops and the grass, go in winter, check the alerts page before you load the truck, and wait for 2027 if you want to sleep there.