The best matches I can find in the CA Blueprint for a Safer Economy suggest outdoor skiing should be able to stay open under all tiers, no explicit matches, but some very similar activites. But local counties can still make their own mandates.
Under Outdoor recreation and Playground:
Campgrounds and outdoor recreation
- Outdoor playgrounds can open with modifications in all tiers. See requirements for outdoor playgrounds to keep them safe and fun for everyone.
- Outdoor skateparks can open with modifications in all tiers. Attendees must adhere to physical distancing requirements and mask wearing as outlined in the outdoor playground guidance.
Can open with modifications
From my previous post above, as of Dec 1, CA just updated it's guidance to address skiing, and put SKI OPERATORS into the Outdoor Recreation section, and so it's officially open in all tiers, rather than being in bureaucratic limbo.
If you click through to the PDF there is a Ski section with "recommendations", but no real bombshells, and resorts pretty much are already doing everything in the document.