Thompson Peak's New Dog Park and the 90-Degree Line on the Preserve Map
"If it will be 90°F or more during your outing, leave your dog at home." That sentence is printed on the City of Scottsdale's Spring 2026 North Area Trail Map for the McDowell Sonoran Preserve, just below the leash rule and above a set of first-aid steps for a dog in heat distress.
The key words are "during your outing." The rule depends on the temperature at the end of your walk as much as at the start. On a fall day that starts at 78 degrees and is forecast to reach the low 100s, a preserve hike with a dog fails the city's own test before you leave the car. That is the main reason the $6.1 million dog park that opened at Thompson Peak Park in late August matters more in October than its opening date suggests. Until afternoon highs drop below 90, the grass park off Hayden Road is the North Scottsdale dog walk that follows the city's advice all day.
On Saturday, September 19, 2026, Scottsdale Fire answered two heat calls from the same trailhead about an hour apart. First, crews reached a hiker about half a mile from Lost Dog Wash Trailhead. Around 11:30 a.m., they were on their way to two women, another hiker and two dogs who had run out of water on the same trail.
The weather numbers explain it. The National Weather Service had the temperature at about 78 degrees at 10 a.m. and about 80 by 11 a.m. The forecast high that day was near 102. At trailhead time, the morning felt mild. Under the city's 90-degree guidance, it was a leave-the-dog-home day.
No gate enforces that line. Phoenix restricts access to named trails from 8 a.m. to 5 p.m. on days with an NWS Extreme Heat Warning. Scottsdale's preserve material offers heat advice instead of a closure threshold, and no formal heat-triggered trail closure policy turned up in the city sources reviewed. So in the McDowells, the dog owner checks the forecast, and the trailhead stays open either way.
Thompson Peak Dog Park is a 3.5-acre off-leash area at Thompson Peak Park, 20199 N. 78th Place, near the southwest corner of Hayden Road and Thompson Peak Parkway. It opened with a ribbon cutting from 8:30 to 9:30 a.m. on Friday, August 21, with free pup cups for the first dogs through the gates.
It took a long time to arrive. The park was identified in Scottsdale's Community Services Master Plan in 2015 and funded through the 2019 Bond Election. The $6.1 million budget combines bond proceeds with additional General Fund dollars. ABC15 rounded the figure to $6 million in its opening coverage.
The features that matter on a warm afternoon are shade canopies, benches, water fountains, pet waste stations and a new restroom building. A footbridge connects the off-leash area to the rest of Thompson Peak Park, and the project added parking along Hayden Road. Scottsdale artist Shachi Kale created four panels for the shade structures showing dogs, local plants and mountain scenery. "Using my love for storytelling and whimsy and folk art, this design incorporates the plant life, mountain landscape, and a variety of dogs, doing dog things!" Kale told Patch. "Birds and cats make appearances, too."
Like every Scottsdale park, it is open daily from sunrise to 10:30 p.m. Those late hours fit the 90-degree guidance on a day that tops out above it. A preserve walk on that day needs to finish before the heat builds. At the park, an owner can wait for evening and then use lit, fenced grass with a water fountain close by.
The park is laid out as three fenced and gated cells instead of one open field, and the reason is the grass. The city rotates the cells so turf can recover between uses. ABC15 described the design as meant to "keep the grass green and the mud away."
The city modeled the park on Chaparral Dog Park. One of the three areas closes periodically for maintenance while the other two stay open. Scottsdale's dog parks also close at times for scheduled maintenance, turf care and mowing. No posted rotation schedule turned up in the coverage reviewed. A chained gate on any given morning is probably a resting cell. It doesn't mean the park is closed.
"The three-cell design gives dogs plenty of room to exercise while giving our staff the flexibility to maintain the turf and keep the park in great condition," said Nick Molinari, senior director of Parks, Recreation and Human Services. The park runs under the same rules as Scottsdale's other off-leash areas.
Thompson Peak became the city's fourth dog park, joining Chaparral, Horizon and Vista del Camino. The four are laid out quite differently.
| Dog park | Address | Layout | Detail worth knowing |
|---|---|---|---|
| Thompson Peak | 20199 N. 78th Place | 3.5 acres, three rotating cells | Shade canopies, restroom, footbridge, Shachi Kale panels |
| Chaparral | 5401 N. Hayden Road | About three acres of grass, three areas | Usually one area for active dogs and one for passive dogs, with the third rotating out |
| Horizon | 15444 N. 100th St. | Dog area at the far west end of Horizon Park | Sits in a retention basin and may flood after storms |
| Vista del Camino | Vista del Camino Park | Half-acre dog area | Shade trees, benches, water fountains |
The table shows the same pattern as the preserve guidance. Scottsdale's two largest dog parks use rotation, which keeps grass on the ground even when one gate is closed. Horizon's basin location makes it the one most likely to be out of service after a storm. Thompson Peak's design is built to stay usable more consistently.
The trail picture this month has its own gap. Brown's Ranch Trailhead, at 30301 N. Alma School Parkway, has been closed since July 13 for a $1.17 million project covering the trailhead building, the parking lot and parts of nearby trails. Patch reported the work was expected to wrap up by fall 2026. As of October 5, no confirmed reopening date had turned up in city or local news sources. Check the city's preserve page before driving out.
The scope covers parking lot drainage and traffic flow, lighting and roofing on the trailhead building, a new trail dispersal area and reroutes of five trail segments. According to June 4 Preserve Commission minutes, parking stalls are being made larger but the lot is not being expanded. Staff described the new plaza as a way to ease congestion where hikers reach the trails. Patch named Pima Dynamite, Fraesfield, Granite Mountain and Tom's Thumb as nearby alternatives during the closure.
The McDowell Sonoran Conservancy's October calendar uses several of those same trailheads, and each of these three walks starts at 8 a.m.:
The calendar listings don't say whether dogs are allowed on these walks. Ask the Conservancy before bringing one.
On days that pass the 90-degree test, the city's trail map spells out the rules and what to carry.
Scottsdale Fire's advice after the Lost Dog Wash rescues was to start early, carry plenty of water, stay hydrated, know your limits, and turn around at the first sign of overheating, according to AZFamily. On days that don't pass, the dog walk is at the Thompson Peak cells off Hayden Road, open until 10:30 p.m.
After 25 years of helping clients settle into North Scottsdale, Marianne knows details like a dog park's gate schedule and a trailhead's reopening date shape everyday life in a neighborhood. For a private conversation about the parks, trails and streets around a home you own or are considering, contact Marianne Bazan.
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