sports season; competitive season
Sports use for the regulated period in which league games, matches, or competitions are played.
The professional baseball season opens next month.
season; part of the year
General use for a season or period of the year; 季節 is the more native Japanese word, while シーズン often sounds slightly commercial, practical, or lifestyle-oriented.
During this season, mornings and evenings get quite cold.
TV season; show season
Used for one production or release block of a TV show, drama, anime, streaming series, and similar media.
A new season of that drama was released for streaming.
season for an activity; busy period for something
Often used in compounds such as スキーシーズン and 受験シーズン for the time of year when an activity is commonly done or becomes especially active.
This town gets lively during ski season.
As entrance-exam season approaches, cram schools get busy.
The baseball season has started.
We've entered pollen allergy season.
It's hard to book a hotel during the season.
That team won the championship for three consecutive seasons.
This drama has entered its third season.
high season; peak season