My experience is you have a much greater chance of ski damage in the Rockies than in the Northeast. In the Northeast, with snowmaking the base is usually decent (and bulletproof) on all open trails. Exceptions are trails that rely on natural snow or the woods. In the Rockies if you venture off the main groomers, you have to be aware of what lurks below the top covering, especially early season when the base is thin. They don't call it the Rockies for no reason.