The Crimson Cushion has been my choice for the beefsteak last season and failing to start another variety, it will be for this year also. Not sure if it is considered a heirloom but it is open pollinated. It seemed to mature late last year but the weather had some to do with that. Love them beefsteaks! Trying new varietiesof tomatoes that were originaly developed for short seasons and released by the North Dakota State University including Super Souix which I have been growing for 2 seasons and others which I have had a hard time finding including Bison, Dakota Gold (my mom raised these in the 60s) and Sheyenne. I have seen them listed in the Sandhill Preservation cataloge but they are either sold out or not available. Anyone can help me locate these varieties? My zone 4 garden is also graced with other open pollinateds like Large Red Cherry, Cherokee Purple and Roma tomatoes plus all non hybrids like Golden Bantam sweet corn, Pederovikc oil seeds, squash, pumpkin, peppers and much more, for seed saving is a large part of my gardening passion.