When cooler temperatures come on in the fall, and the end of the growing season is near, you must learn how to store green tomatoes to ripen, or lose out on part of your harvest.
Take a cardboard box and line it with newspaper. Put the green tomatoes on top of the newspaper in a single layer. Place another layer of newspaper on top of the tomatoes and leave them somewhere in your house in a warm place.
If the end of the season is close and you have tomatoes not ripening, pull the entire plant out of the ground and hang the whole tomato plant upside down.