They changed the calendar on the Outer Banks about fifteen or more years ago, which gave higher color codes for a number of Fall weeks, partly balanced by giving lower color codes to a lesser number of spring weeks. I think they realized the impact of Fall fishing season on the OBX with fewer owners depositing than in spring as many own to use in fishing season, and also demand from fishermen.
There was a plan not long before GPN started to expand the high and shoulder season on the OBX. One of the OBX execs who had really good ties into RCI shared it with me at the time. I remember it pushed red season into more weeks in both the fall and spring, and white also moved outward, as well. However, this change never actually was made for whatever reason.
When the first change was made, owners of weeks that changed from red to white or white to blue in the spring were ''grandfathered in'' by RCI at their former status. For many years thereafter, the resale list at the local t/s reseller would regularly show weeks marked as ''white/red'' or ''blue/white'' which were the grandfathered weeks. I have not seen weeks marked that way in several years, so I don't know if RCI still recognises that or not.
In the Weeks, system, the season designation really means little anyway, as it is the real supply / demand factors for that week that determine trading power, not season color designation. A ''blue'' week 47, when it is Thanksgiving substantially outtrades many of the pinker Red weeks, for example. In the Points system, where ''all red is the same'' for the generic points grid, the season color designation does make a real difference, but this overaveraging is one of the many things that really stink about points.