Why don’t we rest the white/medal tees during the winter?

The generally small areas of our tees means that the areas of the tee left open during winter would receive excessive wear. It is, therefore, better to keep the whole tee area open and move tees around to get consistent wear. The 11th tee is an exception, where a specific winter tee has been created in order to make the hole more playable in winter, rather than as a mechanism to protect the main tee area.