Spring Lawn Care Starter Guide

Begin with a thorough cleanup of the lawn. Rake up leaves, twigs, and debris that have accumulated over winter. This allows sunlight and air to reach the grass crowns. Remove any fallen branches that may have damaged the grass during winter storms. Edge the lawn along driveways, walkways, and garden beds for a crisp border. If you applied a winterizer fertilizer in late fall, early spring is the time to check results. Inspect for areas that experienced snow mold—a grayish or pinkish fungus that appears as circular patches. Rake these areas vigorously to break up the mold and allow the grass to recover. Spot-treat with a fungicide if the mold is extensive.

Thatch—the layer of dead organic matter between grass and soil—builds up over time. If the thatch layer exceeds ½ inch, it blocks water and nutrients from reaching the roots. Use a dethatching rake for small areas or a power dethatcher (available for rent) for large lawns. After dethatching, core aeration relieves soil compaction caused by winter settling and foot traffic. Aeration pulls 2–3 inch cores of soil from the lawn, creating channels for air, water, and fertilizer. Rent a core aerator or hire a lawn service. Leave the soil cores on the lawn—they break down naturally and add beneficial microorganisms to the soil. Water the lawn deeply the day before aeration for best results.

Apply a balanced spring lawn fertilizer with a ratio like 20-5-10 (nitrogen-phosphorus-potassium). Use a broadcast spreader for even coverage—overlapping passes prevent stripes. Water the fertilizer in immediately to prevent burn and activate nutrients. For bare or thin areas, overseeding fills in gaps with new grass. Choose a seed blend matching your existing lawn type (cool-season: fescue, bluegrass, rye; warm-season: Bermuda, zoysia, St. Augustine). Spread seed at the recommended rate, lightly rake to ensure seed-to-soil contact, and cover with a thin layer of straw or peat moss. Water lightly twice daily until germination. Keep foot traffic off seeded areas for at least 3 weeks.

Spring is the critical time for weed prevention. Apply a pre-emergent herbicide (like prodiamine or dithiopyr) when soil temperatures reach 55°F—this stops crabgrass and other annual weeds from germinating. Water the pre-emergent in within 24 hours. Do not aerate or dethatch after pre-emergent application, as breaking the soil barrier reduces effectiveness. For existing broadleaf weeds (dandelions, clover), spot-treat with a post-emergent herbicide on a calm, dry day. Pull weeds by hand if the infestation is small. A thick, healthy lawn is the best weed prevention—dense grass leaves no room for weeds to establish. Adjust your mowing height to 3–4 inches to shade out weed seedlings.

Spring mowing sets the tone for the entire growing season. Set your mower blade higher than you think—3 to 4 inches for most grass types. Taller grass develops deeper roots and shades out weeds. Never cut more than ⅓ of the grass height at once. Keep mower blades sharp; dull blades tear grass, leaving ragged edges that turn brown and invite disease. For watering, deep and infrequent is the rule. Water 1 inch per week (including rainfall) in one or two sessions. Early morning watering reduces evaporation and allows grass to dry before nightfall, preventing fungal diseases. Adjust based on rainfall and temperature. Avoid frequent shallow watering, which encourages shallow roots and weak grass.