Mealy bugs are a spring and summer thing, they hibernate as eggs. Grubs usually stay dormant in winter and don't move much; if the soil freezes and they're not protected, they'll die from ice crystal formation - with a few exceptions.
Earthworms stay mobile, they come up during thaws and drag leaf litter and other material into their tunnels where they degrade and become edible for the worms. But worms can also be semi-dormant, I think it's called suspended hibernation or something.. They move an inch a week or so.
Wood lice can be a serious issue though. They eat live tissue and f- my air layers up. They will attack healthy trees and chew the bark right off. They're crustacians, so most insecticides do not work. I'm experimenting with biocides against silverfish bugs, since those have been mentioned in literature in the past. But I haven't checked for results yet.