The NPS recommends avoiding hiking the Grand Canyon's inner trails between 10 a.m. and 4 p.m., when temperatures are at their peak. Temperatures in the inner canyon can reach over 120 degrees Fahrenheit in the shade, creating "extremely hazardous conditions for hikers," the NPS said.

Dangerous heat and dry conditions fueling the White Sage Fire in Arizona have prompted authorities to expand evacuation zones to clear out the Grand Canyon.

The north rim of Grand Canyon National Park has now been closed and evacuations have been ordered as a wildfire is spreading. Soaring temperatures are making it hard to combat the flames. NBC News’ Steve Patterson reports.

The Mountain West and commissioner Gloria Nevarez angered at least two of the conference’s five departing schools with the early addition of Grand Canyon. The Lopes are joining the MWC for the 2025-26 athletics season after previously agreeing to come ...