https://www.seasonalfoodguide.org/ Put in your state and the produce you want to check.
Generally, green/leafy things are spring, berries are summer, melons and stone fruit are summer, grapes, apples & pears are fall, citrus is winter. July-September is when there's more stuff in season than you can keep up with.
But all of those can be changed by use of greenhouses, geography, local weather patterns, etc (a cool spring can push back all these dates). I don't think meat availability is seasonal anymore, now it's tied to holidays and "grilling season".
But this is also talking about local. I got some awesome grapes from Aldi in the spring last year, because it was fall in South America, where the grapes were coming from. When I used to live in Florida, February was strawberry season.