close season

closed season

noun

the period of the year when it is prohibited to kill certain game or fish
sport the period of the year when there is no domestic competition

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012