Are there Ski lockers available to rent in the canyons? Or do we have to check our ski's in every evening if we don't have car racks?

Most resorts have ski valets

There are day lockers but no overnight lockers. Most if not all hotels/lodges have a valet. There is a valet right next to gondola as well.

The hotels do tend to have ski valets if you're staying there, though.

No lockers available.