Can these be installed and left outside in a more northern state climate where they would be exposed to direct sunlight in the summer and snow/ice in the winter? I wouldn’t be concerned about fading, rather if they would physically deteriorate. Use would be primarily in the summer but removal for winter would not be practical.
EVA foam is extremely durable and can handle all types of weather. These tiles can be left outside for their lifetime, however that length of time may vary because of the weather conditions in your area. These tiles are UV stable and will not fade from sunlight.