Look at what I grew from March to early October in my unheated backyard Wyoming greenhouse!
Like many greenhouse growers I live in a short season area where growing tomatoes outside results in poor yields. The best option is to grow indeterminate tomatoes up strings vertically in the greenhouse. I get bushels of fruit every year. One tip I have found is to use fish based fertilizer early in the season. This has resulted in a dramatic reduction in diseases. Later in the season I switch to more balance fertilizers.