I bet it's vole (meadow mice) damage. Once the snow is gone, they move out of the lawn. In most cases, the turf recovers on its own, but I saw fairly severe damage earlier this week -- the customer bought a bag of soil to fill in the holes/craters along the concrete that the voles created. I normally suggest the customer not rake or disturb the damaged area cuz the rhizomes are still intact within the upper soil profile.
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