Usage patterns
〈事〉の時期が来るfor the time/season for something to come
The harvest season has come.
〈事〉の時期を選ぶto choose the timing for something
Choosing the right time to move is difficult.
〈形容詞〉時期a period characterized by a certain condition
This is a busy period for work right now.
〈事〉の時期に入るto enter a period or phase of something
The rainy season is about to begin.
Expressions
時期が早いtoo early; before the right time; earlier than expected 時期を見てat a proper time; when the time is right