Why Earthworms Appear on Sidewalks After Rain and When to Worry

Normal Variation

Earthworm populations vary greatly between lots based on soil care history. High numbers indicate fertile, well-aerated soil—a good sign.

Soil saturation: Heavy rain or overwatering drives worms to surface for air.
Chemical toxicity: Pesticides or fertilizers can repel/kill worms.
Disease: Rare, but possible.

Birds will clean up most. Eggs remain in soil to repopulate. Reduce watering if saturation is the cause. Avoid unnecessary chemicals.

Lawns: Pricing a 17,500 Sq Ft Sod Job: Don't Guess—Calculate; Acorns on the Lawn: Harmless Nuisance or Real Problem?; Grub Damage in Late Summer: Identification and Next Steps; Controlling Moss in Shady Lawns: The Limestone Solution; Growing Grass in a Small, Heavily Shaded Yard; Fixing a Mixed Bermuda and Kentucky Bluegrass Lawn; Moon-Like Craters in Lawn Near Water May Indicate Tidal Influence; Visible Runners on Lawn: Causes and Renovation; Lawn Edge Grading: Soil Below Sidewalk Level Is Ideal; Compost Application on Established Lawns: Skip Aeration, Feed Earthworms

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