Parks Canada (National Parks) provides the reservation launch dates in November or December for the next summer. The reservations launch on different dates for each park, but are usually spread between January 15th and February 15th
Alberta Parks (Provincial Parks) has a rolling-window system where reservations can be made 90-days in advance for individual and backcountry camping and 180-days in advance for group and comfort camping
US National Park Service (NPS) (and in particular Montana Glacier National Park) has a rolling-window system where reservations can be made 6 months in advance.
The Alpine Club of Canada has a number of backcountry huts. They have a rolling-window system where reservations can be made 6 months in advance for ACC members, and 3 months in advance for non-ACC members.
