It's cold. The nighttime temps in Red Rock are below freezing. Water will freeze at night and might still be ice during daylight hours. It depends on how much sun the route gets. Deep canyons will not get much sun. Routes that have high southern walls blocking them will not get sun and could have ice. The hike to Oak Creek Overlook is a good example. It's less than 20 miles from the Las Vegas Strip. Luckily, there's not much water on the route unless it rains or snows.
Even very good hikers can slip on ice. The ice can be tricky to see. You might only fall on your butt, however it could be much worse. The video below recounts Jason's story. Please watch it. Jason is fine now and leads hikes for the 52 Peak Club. Jason recovered quickly because he was in great shape, young, and only weighs around 130 pounds. His accident occurred in 2012.
Branch Whitney is the author of Hiking Las Vegas and creator of the 52 Peak Club where members hike to the best 52 Peaks around Las Vegas, NV