- Arapahoe Basin Ski Area: Mid-October
- Aspen Highlands: Nov. 22
- Aspen Mountain: Dec. 8 (according to Colorado Ski Country USA)
- Beaver Creek Resort: Nov. 21
- Breckenridge Ski Resort: Nov. 9
- Buttermilk: Dec. 8 (according to Colorado Ski Country USA)
- Cooper: Dec. 8
- Copper Mountain Resort: Nov. 16
- Crested Butte Mountain Resort: Nov. 22
- Echo Mountain: Nov. 23
- Eldora Mountain Resort: Nov. 22 (according to Colorado Ski Country USA)
- Granby Ranch: Dec. 14 (according to Colorado Ski Country USA)
- Keystone Resort: Nov. 9
- Loveland Ski Area: Targeting mid-October
- Monarch Mountain: Nov. 21 (according to Colorado Ski Country USA)
- Powderhorn Resort: Dec. 13
- Purgatory Resort: Nov. 17 (according to Colorado Ski Country USA)
- Silverton Mountain: Nov. 24
- Snowmass: Nov. 22
- Steamboat Resort: Nov. 21
- Sunlight Mountain Resort: Dec. 8 (according to Colorado Ski Country USA)
- Telluride Ski Resort: Nov. 22 (according to Colorado Ski Country USA), but the previous two opening days were delayed until Dec. 7, 2017 and Nov. 28, 2016.
- Vail Mountain: Nov. 16
- Winter Park Resort: Nov. 14
- Wolf Creek Ski Area: Oct. 13 (starting with weekends only)
images from wolf creek fb & abasin fb & wikimedia.org