17 Sep 2017 – Two other national parks, Yellowstone and Grand Teton, also reported snowfall.
Rocky Mountain National Park posted a snapshot from their Alpine Visitor Center camera, saying that it’s the first snow to hit the high country there this season and that some roads were closed as a result.
On it’s Facebook page, Yellowstone said that the hills east of Mammoth Hot Springs were blanketed Saturday morning, and that the winter-like weather was expected to continue.
As in Rocky Mountain National Park, some Yellowstone roads were closed due to the snow, but reopened Sunday morning.
Thanks to Stephen Bird for this link