off-season

• offseason

off-season (plural off-seasons)

1. The part of the year when business is most slack and there are fewest clients or visitors.

   Synonyms: low season, white week

   Seaside resorts in the off-season are really depressing.

2. (sports) A period of time when regular competitions are not being held, or when an athlete is not participating in competitions.
   • 1983, Joe Weider, The Weider System of Bodybuilding, page 4:

     Alternating off-season and precontest cycles in bodybuilding over a period of years will result in the relatively quick development of a championship physique.

   • 2023 April 5, Jeff Howe, “In Belichick’s pursuit of glory, nothing is off the table, even idea of trading Mac Jones”, in The Athletic‎:

     That’s why virtually nothing should be off the table this offseason, including the idea of improving at quarterback.

• Usually preceded by the definite article "the", but also used attributively.