Strawberries are cheaper when they're in season.

草莓在上市季节很便宜。

youdao

These are the dog days; watermelons are just in season.

现在是伏天，西瓜正当令。

《新英汉大辞典》

There are a few ideas around on how to treat fillies and mares in season.

关于如何对待发情期的小母马和母马有几种观点。

《柯林斯英汉双解大词典》

In the first season of the show, Sookie's friends are not very happy that she is interested in a vampire.

VOA: special.2010.01.20

Other days, I'd just make whatever's in season.

其他时候，我就做任何应季的食物。

妈妈亲手做的味道 - SpeakingMax英语口语达人

Spending 20 minutes walking allows me to be in contact with what is season like, and what is the day-to-day change and the weather.

每天花上二十分钟走路，这让我,感受到了每个季节的不同，也感受到了每天的变化和每日的天气。

普林斯顿公开课 - 人性课程节选

The elder Herold, from Luray (population 194), plays at least twice a week in season.

WSJ: Sand-Greens Golf: A Game Lives On in the Great Plains

Well, believe it or not, there are some other sports in season right now.

NPR: Sports Beyond The Olympics

When soft-shell crab is in season, we've served a whole fried one with Thai influences.

WSJ: Endless-Summer Baked Blue Crab