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So you are not too late, a lot of the summer crops you can still plant: green beans, long beans, tomatoes, peppers, salads etc.
The problem could be that you have to prepare the soil but you could start most of your seedlings in trays indoors and move them out when you are ready.
You won't be the first to have tomatoes but you can still get a couple months worth if you got good weather.
In what state is your land/garden?