The last two summers here in Denver have been on the cool side. My tomatoes haven"t ripened until late August and they weren't very flavorful. From the radio I learned that the nights must be 45 or higher for tomatoes to ripen. The soil must stay warm. They suggested covering the soil around the plant with black plastic or black ground cloth to help heat and mantain the warmth though the night. Guess I have my work cut out for me come spring. I'm also going to try the Early Girls also. Happy Gardening