Vail Ski Holidays When Do Summit County Ski Resorts (breck, Vail, Copper, Etc) Typically Open 100% Of Their Ski Acreage?

When do Summit County Ski resorts (breck, vail, copper, etc) typically open 100% of their ski acreage? - vail ski holidays

To be in a normal year, ski, where the Summit / Eagle County ski resorts (Breckenridge, Vail, Beaver Creek, Keystone, Copper Basin A are) in general by 100% of the surface?

I know that the first part was the slow this year, ski ... I wonder how far behind the ski areas, compared to a normal year.