Snow mold and winter damage: what Chicago winters do to lawns
The snow finally melts and your lawn looks... diseased. Matted gray-white circles, straw-colored patches, crusty webbed grass. Most of it is snow mold — and most of it is preventable with two fall habits.
What you're looking at
Gray snow mold shows up as matted, bleached circles up to a couple feet wide, often with a crusty webbed look, anywhere snow sat long — especially plow piles and drifts. It usually only kills the blades. Pink snow mold (a salmon tint at patch edges) is nastier and can damage crowns and roots.
Spring triage
- Rake matted patches gently to break the crust and let air in — most gray mold areas green back up on their own within weeks
- Be patient before reseeding; judge what's truly dead in May, not March
- Patch what didn't recover using the steps in our bare patch guide
Other winter damage you'll meet
Salt burn browns lawn edges along walks and driveways — flush with deep watering in early spring. Vole trails are winding surface runways under snow cover; rake and they typically fill in.
Prevention is a fall job
Snow mold feeds on long matted grass and trapped leaves. The fix is exactly two items from our fall checklist: a shorter final mow, and complete leaf removal before snow. Do both — or book a fall cleanup and have both done — and spring looks dramatically different.