It can be a bit tricky to hang Christmas lights on stucco, but there are a few methods you can use. One is to drill small holes into the stucco using a drill bit and hammer, then insert hooks or screws into the holes and hang the lights from them. Another method is to use removable adhesive hooks, which can be placed on the surface of the stucco without damaging it. Alternatively, you could use wire clips or hooks that attach to the stucco using an adhesive backing. Whatever method you choose, be sure to take the necessary safety precautions and avoid damaging the stucco.