Seasonal Lawn Care Calendar for Sonoma County

Your lawn is a living system that changes with the seasons, and keeping it healthy throughout the year requires different strategies in each season. Here in Sonoma County, our mild winters and warm, dry summers create unique lawn care demands that differ from colder climates. Understanding what your grass needs month by month is the key to avoiding patches, disease, and stress.

Spring: Waking Up Your Lawn

Spring is when your Sonoma County lawn comes out of dormancy and starts actively growing. If you haven't already, early spring (March through April) is the perfect time to tackle cleanup—rake out winter debris, remove dead thatch, and aerate if you notice compacted soil. Aeration opens up the earth so roots can breathe and water penetrates deeper.

Once the soil warms and growth picks up, it's time to fertilize. Apply a balanced, slow-release fertilizer that won't burn your grass or waste nutrients. Spring is also when many weeds emerge, so consider a pre-emergent if you had weed trouble last year, or pull weeds by hand before they spread. Keep your mower blade at a taller setting (about 2.5 to 3 inches) to shade out weed seedlings and reduce stress on new growth.

Summer: Smart Watering and Maintenance

Summer in Sonoma County brings heat and dry conditions that stress lawns. Proper watering is non-negotiable. Water deeply and less frequently rather than daily light sprinkles—this encourages deeper root systems that are more drought-resistant. Early morning watering (before 8 a.m.) minimizes evaporation and reduces disease risk. Most lawns need about 1 to 1.5 inches per week, depending on temperature and soil type.

During summer, mow less frequently but keep your blade sharp and high. Never remove more than one-third of the grass blade in a single mowing, and consider leaving clippings on the lawn—they break down and return nutrients to the soil. Watch for summer stress signs like browning patches or insect activity, and avoid fertilizing during peak heat, as this can stress the grass further.

Fall: Preparation for Dormancy

Fall (September through November) is arguably the most important season for Sonoma County lawns. As temperatures drop and rain returns, your grass is primed for growth. This is the ideal time for overseeding thin or bare patches, as fall moisture and mild temperatures give new seed the best chance to establish. Aerate again if you haven't recently, then seed bare spots or the entire lawn if needed.

Late fall is also the best time to fertilize with a formula higher in potassium and phosphorus (the last two numbers on the fertilizer bag). These nutrients harden off your grass for winter and strengthen roots. Keep raking leaves—a thick layer smothers the lawn and promotes disease. Continue regular mowing until growth slows.

Winter: Minimal Care and Planning

Winter is the gentlest season for lawn care in Sonoma County. Our mild winters mean your grass doesn't go completely dormant like it does in colder regions. Mow occasionally when growth warrants it, but avoid heavy foot traffic or mowing when the lawn is saturated from rain—this causes compaction and muddy damage. Keep gutters clear so water doesn't collect in low spots, which can lead to fungal issues.

Use winter for planning: inspect problem areas, note drainage issues, and think about spring projects. If you had pest or disease problems during the year, do some research on resistant varieties or preventive measures for next season.

Adapting to Sonoma County's Climate

Our Mediterranean climate—wet winters, dry summers—means your lawn follows different rhythms than lawns in other parts of California or the country. The key is working with your local conditions, not against them. Choose drought-tolerant grass varieties if possible, mulch around nearby trees and shrubs to retain moisture, and don't fight Mother Nature by trying to maintain a lush green lawn during our dry season.

Consistent, seasonal attention beats sporadic panic efforts. A little care each season prevents expensive problems down the road and keeps your yard looking good year-round.