The short version: the coast runs on salmon and daylight, and the mountains run on snow. Most of the collection opens between May and June and closes between September and October. 4 are open all year, and the two heli-access lodges above Golden close for the shoulder seasons and open again for skiing in December. The rest of this page is the long version.
The calendar is built from the record, not from a brochure. A mark means the operator's published season covers that month, at the catalogue's resolution; the exact window, in the operator's own words, is quoted beside every entry below. Where an operator publishes no dates, the entry says so.