Zone 4 means frozen soil in the winter? In which case spring planting is best. Raised beds would be a good idea for veg beds, it's also much better to irrigate via some kind of leaky pipe system, waste much less and you can automate it. You get hot summers there don't you?
Not much variety for zone 4 on arborday, try this:
Apricots are easy as long as you can keep squirrels off them (they eat the kernels and discard the flesh), there are quite a few good apples and cherries too. You may be able to grow some chestnuts, and I believe there are grapes that will be hardy too, as long as you have some summer heat and enough good weather in autumn to ripen them.
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