Grand Canyon, North Rim
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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.
Here's what's open and closed at Grand Canyon North Rim, South Rim and Phantom Ranch in the wake of wildfires that destroyed the North Rim lodge.