I finally picked a couple of tomatoes this weekend. 'Glacier' heirlooms are one of my favorites for production and extended season. They start blooming when the babies are about 6 inches tall.
I start all of my heirloom plants about Superbowl Sunday under lights, then pot up to 4 inch peat pots as they grow and the weather warms up. These were in the ground late - April 13, with a couple of cold snaps after that requiring a tarp cover.