Here in Michigan, the few hot days we had in April brought a lot of the bugs out early only to be killed by the frost.
We did have a nasty, nasty ice storm back in January, and the tree limbs, plants, ground, everything was coated in ice for about three days.
Now I don’t know where aphids hang out in January or if an ice storm would bother them... I know one of the other PIA bugs we have around here is earwigs, and they breed and live in the ground during the winter. Sometimes doing spring digging, I hit a nest of them, and all the sudden like you see ten thousand tiny earwigs on your shovel (or gloves!!)
But they are basically scavengers and totally harmless.
Ugly, but harmless.