Triple-digit temperatures return as Scottsdale officials urge hikers to prepare before hitting the trails

With temperatures climbing into the upper 90s and low 100s across the Valley this week, Scottsdale officials are reminding residents and visitors that desert heat can turn dangerous quickly, especially on exposed hiking trails. A recent mountain rescue near Tom’s Thumb Trailhead served as another reminder that preparation, hydration and timing are critical when recreating outdoors during Arizona’s warmer months.

Earlier this month, crews from the Scottsdale Fire Department rescued a hiker and dog near Tom’s Thumb Trailhead who were low on water and needed assistance off the trail. The incident highlights the importance of preparing before heading outdoors.

The McDowell Sonoran Preserve and Pinnacle Peak Park continue to offer world-class opportunities for hiking, biking, rock climbing and equestrian use, but desert conditions can become dangerous quickly as temperatures rise.

In 2025, the Scottsdale Fire Department documented 95 heat-related incidents.

Hikers are encouraged to understand their physical limitations, choose routes appropriate for current weather conditions and carry more water than they think they will need.

For those hiking with pets, officials stress that dogs are especially vulnerable to heat-related illnesses because they cannot regulate body temperature as efficiently as humans. Pet owners should bring extra water for themselves and their animals, avoid hiking during peak heat hours and watch for warning signs such as excessive panting, drooling or lethargy.

“Preparation saves lives. Whether you’re a first-time visitor or a seasoned desert hiker, heat impacts everyone,” said McDowell Sonoran Preserve Director Jenna Kohl. “We want people to enjoy these incredible protected lands, but we need them to do it safely.”

Residents and visitors are encouraged to familiarize themselves with the signs of heat exhaustion and heat stroke before heading outdoors.

Signs of heat exhaustion include:

• Feeling faint or dizzy
• Excessive sweating
• Clammy skin
• Nausea or vomiting
• Rapid, weak pulse
• Muscle cramps

Signs of heat stroke include:

• Throbbing headache
• Red, hot, dry skin
• Lack of sweating
• Nausea or vomiting
• Rapid, strong pulse
• Loss of consciousness

Kohl recommends hiking during cooler morning hours and finishing outdoor activity by 10 a.m. Hikers should continuously hydrate and consider turning around once half of their water supply has been consumed.

Additional recommendations include:

• Wear lightweight, sun-protective clothing
• Choose shorter routes during warmer weather
• Tell someone where you are hiking
• Carry electrolytes, navigation tools, a charged phone and a basic first aid kit
• Avoid bringing pets during elevated temperatures

In the event of an emergency, residents and visitors should call 911 immediately.

More hiking safety information is available at ScottsdaleAZ.gov, search “Hiking Safety.”