UPDATED: RED Mountain Resort and Whitwater are both closed for the season.
RED is closed for lift skiing -- and also for ski touring and all forms of motorized access. The area closed to skin-assisted wanderers, snow machines and other motorized vehciles, is shown in the attached map. RED explains:
"As a reminder, the area is closed to motorized vehicles and ski touring. Avalanche control terminates at season end and staff and equipment continue to work in the Controlled Recreation Area.