Yes, cable trays can be used outdoors, but they require proper consideration of environmental factors such as temperature, humidity, and exposure to sunlight, rain, and other weather conditions. Improperly secured covers on outdoor cable trays can cause a serious hazard in harsh environment conditions such as wind, snow, and ice. The choice of materials and the type of coating used for the cable tray should also be suitable for. Before delving into their suitability for outdoor use, it is essential to have a basic understanding of cable tray rollers. The short answer is yes, they can.