Answer by  
                                                                                          mammakat (11147)
                                                            
                          
                          
                                                          Your cactus is frost tolerant to 0 degrees F. Cut off water to the plant in the winter months to avoid frost injury. Ocotillo can look dead and blossom out jubilantly in spring after a good rain or irrigation. In case of freeze cover with frost fabric aka frost fleece.