Brown Spots in Lawn
Brown spots in your lawn are one of the most common lawn headaches—and they rarely share one cause.
Drought, fungus, pet urine, grubs, and thin turf can all look similar from the driveway. Two neighbors can have the same patchy brown look for completely different reasons.
Without a close look at your grass, it's easy to treat the wrong problem and watch spots spread anyway.
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Common causes
Drought and heat stress
Dry soil and hot sun turn grass straw-colored, often in sunny strips or where sprinklers miss.
Lawn fungus
Brown patch and dollar spot show up as tan circles or rings that spread after warm, humid nights.
Pet urine
Concentrated nitrogen burns small circles—often along fences, paths, or repeat bathroom spots.
Grubs and insect damage
Grass pulls up easily in patches; birds pecking the same areas is another clue.
Thin or compacted turf
High-traffic paths and worn areas brown first where grass roots are weak or soil is packed.
How to identify the issue
Compare these three clues before you treat:
- Color
Straw-yellow often means dry heat stress. Rusty tan circles may point to fungus. Dark brown centers with a green ring can be pet urine.
- Spread pattern
One random spot is different from clusters or rings that grow outward each week—that growth pattern matters.
- Location
Full-sun strips, shady corners, along fences, or soggy low spots each narrow the cause list fast.
Not sure which one this is?
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Quick fixes
- Press a finger into the brown patch—if the soil is dry several inches down, adjust watering before adding more products.
- Snap a morning photo in natural light; harsh noon sun washes out color clues.
- Hold off on blanket fungicide until you see spreading rings or slimy grass at dawn.
- Mow slightly higher on stressed turf—scalping slows recovery.
- Confirm the cause with a photo before buying treatments you may not need.