One thing I've had very good success with here is covering my overwintered garlic, shallots, and topset onions with a bit of straw (light enough to still see the ground underneath) covered by 3 or 4 mil sheet plastic, well anchored. It prevents heaving with cold weather and no snow, and gives things an early start in the spring.
3 years ago I nearly lost everything to a constant freeze/thaw cycle that occured all winter long. Decided from there to cover it and since have had nearly 100% germination in the spring and some great early crops.