Cyclocross Racing Season
Typically an Autumn and Winter sport, the season starts in September and runs until February with World Championships occurring in late January.

Because a season spans two calendar years seasons are often referred to as both years that they span; such as the 2005-2006 season, as simply saying 2005 could imply late 2004-2005 or early 2005-2006 (this is less of an issue outside Europe in countries such as Canada and the US where the national championships happens in November and December respectively and racing tapers off dramatically after that).

Due to the placement of World's a rider's cyclocross racing age is always one year older than their road racing age. -from Wikipedia