By now everyone in Las Vegas has seen the snow in the mountains. Charleston received over 12 inches of snow at an elevation of 8,500 feet last night. The roads are opened, but traction devices are recommended. I am not sure what that really means? Hiking is out; snowshoeing is in. A gps is recommended due to the snow covering the trails.
Red Rock (photo above) got snow down to 4,000 feet. All the peaks have snow on them and I strongly advise against trying to scramble to them. Even Calico Hills got snow. If it continues to stay sunny, I believe that numerous routes in Calico Basin will be doable by noon tomorrow. All of there routes are in the Member's Only Section of my website: www.hikinglasvegas.com.
The good news is all the waterfalls should be flowing and accessible. Las Vegas needed this snow as we were way under the average rainfall. Lake Mead is an option. The hiking is not as good as Red Rock, but there are a handful of decent hikes.