How to Fix Bare Spots, Brown Patches, and Common Lawn Problems

Every lawn develops problems from time to time. Brown patches, bare spots, and thinning grass are frustrating but almost always fixable once you identify the cause. The key is accurate diagnosis — treating the wrong problem wastes time and money, and can actually make things worse. This guide walks you through the most common lawn issues and how to fix them.

Bare Spots

Common Causes

• Heavy foot traffic or pet urine damage
• Grub damage (turf pulls up easily like a carpet because roots have been eaten)
• Fungal disease that killed the grass
• Spilled chemicals (fertilizer burn or herbicide damage)
• Compacted soil that prevents grass from growing
• Heavy shade from trees or structures

How to Fix Bare Spots

• Step 1: Address the underlying cause first. If grubs caused the damage, treat for grubs before reseeding. If compaction is the issue, aerate the area.
• Step 2: Rake the area to loosen the top half inch of soil. Remove any dead grass and debris.
• Step 3: Apply a thin layer (quarter inch) of quality topsoil or compost over the bare area.
• Step 4: Spread grass seed appropriate for your region at the rate listed on the seed bag. Choose a seed that matches your existing lawn.
• Step 5: Apply a starter fertilizer to promote root development.
• Step 6: Cover lightly with straw or use a seed blanket to retain moisture and protect from birds.
• Step 7: Water lightly 2-3 times per day to keep the seed moist (not soaked) until germination. Gradually reduce watering frequency as grass establishes.

The best time to reseed bare spots is early fall for cool-season grasses and late spring for warm-season grasses. Seeding during these windows gives the new grass the longest possible growing period before extreme temperatures arrive.

Brown Patches and Discolored Areas

Brown or discolored patches can be caused by many different things. Careful observation helps narrow down the cause before you spend money on treatments.

Fungal Disease (Brown Patch, Dollar Spot, etc.)

Fungal diseases typically create circular or irregular brown patches, often with a distinctive ring pattern at the edges. Brown patch disease creates large circular areas (1-3 feet in diameter) with a smoke ring border. Dollar spot creates small silver-dollar sized spots that merge into larger areas. Both are most active during warm, humid weather.

• Improve air circulation by pruning nearby shrubs and avoiding evening watering
• Water early in the morning so grass blades dry quickly during the day
• Avoid excess nitrogen fertilization during active disease periods
• Apply a general-use fungicide containing active ingredients like myclobutanil or azoxystrobin if the problem persists. These are available at most garden centers.
• The lawn usually recovers on its own once weather conditions change, but fungicide prevents further spread

Grub Damage

Grub damage typically appears in late summer or early fall. The grass turns brown in irregular patches and feels spongy underfoot. The telltale sign is that affected turf can be rolled back like a carpet because the roots have been eaten. You may also notice increased bird, skunk, or raccoon activity as they dig for grubs.

• Peel back a section of damaged turf and count the grubs. More than 5-10 grubs per square foot typically indicates treatment is needed.
• Apply a curative grub control product (trichlorfon/Dylox) for active infestations. Water it in immediately.
• For future prevention, apply a preventive grub control product the following spring or early summer.
• Reseed damaged areas after grub treatment takes effect.

Dog Urine Damage

Dog urine creates distinctive circular dead spots, often with a ring of extra-green grass around the edge. The nitrogen concentration in urine burns the grass in the center but fertilizes the surrounding grass. This pattern is the key identifier.

• Train pets to use a designated area of the yard
• Water the area immediately after the pet urinates to dilute the nitrogen
• Rake out dead grass and reseed the spots
• Products marketed as urine spot treatments are essentially just seed and fertilizer — you can achieve the same result with grass seed and starter fertilizer

Drought Stress

During hot, dry periods, lawns can turn brown as the grass goes dormant to survive. This is a natural survival mechanism and the grass is usually still alive. Cool-season grasses go dormant in summer heat, while warm-season grasses go dormant in winter cold.

• Check if the grass is dormant or dead: pull on a brown grass plant. If it resists and stays rooted, it is dormant and will recover. If it pulls out easily, it may be dead.
• Water deeply (1 inch) once a week to keep dormant grass alive without forcing it out of dormancy
• Avoid heavy foot traffic on dormant grass
• Once rain returns or you resume regular watering, the lawn will typically green up within 2-3 weeks

Thin, Weak Grass

If your lawn is gradually thinning rather than developing distinct patches, the issue is usually cultural — meaning your lawn care practices need adjustment.

• Get a soil test: Low pH, nutrient deficiencies, or poor soil conditions are the most common causes of chronically thin lawns. Fix the soil and the grass will respond.
• Check your mowing height: Scalping (mowing too short) weakens grass by removing too much leaf blade. Most lawns should be mowed at 3-4 inches.
• Evaluate sunlight: If trees have grown and now shade the area, your grass may not be getting enough sun. Consider shade-tolerant grass varieties or alternative ground covers.
• Aerate compacted soil: If the soil is hard and compacted, grass roots cannot grow properly. Annual core aeration opens up the soil and dramatically improves growing conditions.
• Overseed in fall: For cool-season lawns, annual overseeding in September helps maintain thickness. Spread seed at half the rate recommended for new lawns.

Moss and Algae Growth

Moss growing in your lawn is a symptom, not the main problem. Moss thrives in conditions where grass struggles: shade, wet soil, compacted soil, and low pH. Killing the moss without fixing the underlying conditions means it will return.

• Test your soil pH: Moss loves acidic soil. If your pH is below 6.0, apply lime to raise it according to your soil test recommendations.
• Improve drainage: If the area stays wet, the soil may need aeration or grading to improve water flow.
• Reduce shade: Prune trees and shrubs to allow more sunlight to reach the lawn.
• Iron-based moss control products can kill existing moss, but the area must be addressed with the corrections above or moss will return.
• In heavily shaded, wet areas, consider replacing lawn grass with shade-tolerant ground cover plants.

When to Call a Professional

Most lawn problems can be addressed by a motivated homeowner with the right products and knowledge. However, consider calling a licensed lawn care professional if you have persistent problems that have not responded to treatment, large-scale damage covering a significant portion of your lawn, suspected issues with restricted-use pests or diseases, or if you simply do not have the time to diagnose and treat the problem yourself.

This article is for general educational purposes only and does not constitute professional agronomic advice. Lawn problems can have multiple causes, and accurate diagnosis may require laboratory testing or professional assessment. Always read and follow product labels when applying any lawn care product. Contact your local Cooperative Extension office for diagnosis assistance and region-specific treatment recommendations.