Voles: not in my experience.

Ours like more expensive things which are more labour-intensive to plant; especially spring crocuses.

Moles are never a problem--they are insectivores, which means they eat only soil insects, never, ever plant material. And snow in summer is so vigorous that even if voles did eat some roots--unlikely--it would recover fast.

IME moles can be problem with plants, not because they have interest in the plants, but because in their seach for grubs, etc. they tunnel under roots, leaving them exposed to air.

Why do you ask? When I had snow in summer in my garden, it always looked fairly bad at this time of year due to foliage diseases perhaps; tthe main reason I stopped growing it was its ratty summer appearance though it also seeded around too much for me.