They're warning that people who use mapping apps to avoid highway closures or to shorten their travel time can sometimes find themselves in very dangerous situations with unplowed roads, heavy snow, and no cell phone service.
The Pacific Crest Trail is closed in it's northern section of the Okanogan Wenatchee National Forest because of wildfires.
There are nine fires burning in the Pasayten Wilderness Area, which has led to the closure of the trail from Holman Pass north to the Canadian border.
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This Labor Day Weekend will bring an extra wave of campers before summer ends, so prepare to have a second or third choice in case a popular campground is already filled.