I can't speak for their plans at the Rock Creek Cattle Company club...but we opened this year on March 3rd...regular greens. We closed on March 4th...3 inches of snow that did not melt until the following Thursday...since then we have been open everyday. We are mowing greens and getting clippings...we'll be open until close to Thanksgiving.
Deer Lodge, and that particular location, should be playable shortly after we open....I doubt they would open though until sometime in April....maybe close at the end of October.