Skiing mid week at Mammoth is fantastic! (especially in January). You will rarely encounter a queue and the trails are uncrowded. In fact I’ve heard people saying they wished there was a wait for the lifts so they could get a rest before the next run! And unlike some other resorts I’ve been to Mammoth keeps all lifts operating on quiet days giving you access to 100% of the terrain, weather permitting of course. It’s a great time to enjoy a lesson too, since you can concentrate on what you’re doing rather than worrying about other skiers and riders. There can often be midweek deals and discounts on lift tickets and hotels etc, visit mid week and enjoy the white space!