Flagstaff, Ariz. – Day hikers in Grand Canyon National Park are facing life-threatening heat this week as temperatures soar past 110°F in the inner canyon.
An Extreme Heat Warning is in effect until 7 p.m. Friday for areas below 4,000 feet, including popular hiking destinations like Havasupai Gardens (104°F) and Phantom Ranch (114°F).
The National Weather Service in Flagstaff has issued the warning, which is rarely triggered, signaling some of the hottest days of the year. This extreme heat brings serious risks for visitors, especially those attempting to hike or explore lower elevations of the park.
Hikers on the Bright Angel Trail are advised not to descend more than 1.5 miles from the rim. Between 10 a.m. and 4 p.m., outdoor activity is strongly discouraged unless hikers are stationed at Havasupai Gardens or in campgrounds with proper shelter.
Without sufficient cooling, hydration, salty snacks, and electrolyte supplements, hikers are at high risk for heat-related illnesses such as heat exhaustion or heat stroke.
Park rangers are urging visitors to either hike early in the morning or avoid hiking altogether during the hottest parts of the day.
It is important to wear wide-brimmed hats and sunscreen to protect from sun exposure, increase caloric intake to maintain energy levels during extreme heat stress, and hydrate frequently while carrying enough water for the journey.
The Extreme Heat Warning remains in effect through Friday, with additional advisories possible if temperatures remain elevated into the weekend. Hikers and visitors are urged to stay informed and prioritize their safety by adhering to these safety guidelines during this extreme heat event.