I am going to trial many early season tomatoes outside this year in the Matanuska Valley. I used to try this stuff 20 some years ago, but when I got my first greenhouse it all changed. However, after befriending several seed collectors from around the world, I am going to revisit this project. I did a few varieties the last couple of years, with pretty darn good results, I know others who are doing the same thing. If you want to can tomatoes for winter, this can really help you get enough to do so, even though yields per plant are lower. If you get 5lbs per plant off of 50 plants, you will be eating sauce in December. If you also have a small greenhouse, you certainly will have enough.
I have read the UAF trial reports, and their selected varieties, I think they needed to do more research. I currently have about 15 new varieties to try, and one is supposed to be frost tolerant, not cold tolerant, and is supposed to be delicious to boot. Dinkel's 1960's reports sure are interesting to read through too, but most of those varieties are gone, or not on my like list.
I also may have found Dad's old variety he used to grow in Indiana, when I was a kid. I was telling him I had collected several versions of Rutgers to try this year, he perked up and said " that sure sounds familiar." I will know as soon as I taste one. Since I posed a question a few years ago, concerning you guys favorites, I have went through 250-300 varieties, and still have not found that tomato.
Try some new varieties, lets share results.