Sorry that no one's responded to your inquiry. There are numerous edibles suitable for zone 2a. Sour cherries, plums, hazelnuts, apples, small pears, rhubarb, raspberry, strawberries, etc. Some have tried apricot as well.

Rather than list specific varieties, here is a link of a nursery located in Saskatchewan, Canada, zone 2.

Here is a link that might be useful: DNA Gardens website

I'm in zone 2a in east central Saskatchewan. I have an annual veggie garden as well as herbs, rhubarb, raspberries, nanking cherries, asparagus and saskatoon berries. There is a huge sour cherry festival every year in a nearby town. My father has apples and a beautiful plum tree in this zone as well. What specifically do you want to eat?