I live in northern Michigan, the upper part of the lower peninsula; my gardening zone is 4b/5a and the main growing season starts in May ends in September-November (depends on weather).

I'm looking for early maturing determinate tomatoes that are slicers; I would also like for them to be cold hardy due to my area and climate. For early maturing, 45-60 days is the days to harvest I'm looking for.

By 'slicers' I mean tomatoes you would fresh, in a salad/sandwich.

If heirlooms are all that are available, that is fine; however I'd prefer to avoid them because they are more finicky to grow to my knowledge.