Summertime is the primary European cruise season, although the season lasts from April to November. The summer months are considered high season, during which time you are less likely to get a discounted rate. The months of April, May, October and November are considered shoulder season, and discounted rates abound. Some cruise lines do operate in December, and feature special holiday-themed cruises, which may also have discounted rates. Generally the first trip of the season posts lower fares, as the staff and crew are just “warming up” for the season.