Las Vegas and the surrounding mountains got blanketed by snow on Monday. All trails and routes in Red Rock Canyon are covered in snow. The photo to the left was taken at Calico Basin today (12-15).
Obviously, Mt. Charleston is a winter wonderland. Be aware driving to Mt. Charleston will require snow tires or chains and traffic will be a nightmare. I don't think Lake Mead area received any snow, except for a few summits.
It will take quite awhile for the snow to melt in the higher elevations at Red Rock. However with the forecast calling for sunny days later in the week, all waterfalls at Red Rock will be flowing big time! For now all hikes should be done in the Lake Mead area.