“Are tomatoes still in season?”
You're planning a family dinner with your brother. You have to find a salad recipe to make for everyone. You see a great recipe for tomato salad, but you aren't sure if you can find good tomatoes right now.
Are tomatoes still in season?
Each type of fruit and vegetable has a certain time of year when it becomes ripe and tastes the best. During that time, you can say that it's "in season". For example:
I think pears are in season soon.
You can also say that "It's ___ season":
It's strawberry season. We should go pick some at the farm down the road.