No, it is not too late to have your own personal vegetable planter producing a crop this year. One way is to plant EarthBoxes, and they are now on sale (see their web site). I have had a planter for over twenty years, and I call mine the pepper growing machine because they produce all summer until frost. It produces more peppers than we can ever use. I hope these step by step planting instructions help.
Remember, as the plants start growing and the weather gets hotter, I make sure to add water to the boxes through the tubes daily until it flows out the base or holes on the sides, depending on the type you have. Over the years, the cover on the top wears out, and that is the only part that I have ever had to replace.