Why Your Lawn Has Bare Patches (and it is not just grubs)
Are you noticing bare patches in your lawn as the snow melts?
If you’re noticing circular or irregular bare patches in your lawn this spring, your first thought might be: “Great. I have grubs.”
But in the Twin Cities, grubs are only one of several common causes — and they’re not even the most likely one after winter.
Here’s what could actually be happening — and how to fix it.
1. Snow Mold (Most Common After Heavy Winters)
Snow mold is one of the most common reasons homeowners see circular lawn damage in early spring.
What it looks like:
- Circular patches (6 inches to 3 feet wide)
- Matted, straw-colored grass
- Sometimes gray or pink webbing
Snow mold forms when:
- Snow sits on unfrozen ground
- Leaves weren’t fully cleaned up in fall
- The lawn went into winter too long
The good news:
In many cases, snow mold damage is cosmetic and can recover with light raking and proper fertilization.
The not-so-good news:
If the grass is fully dead, overseeding or patch repair may be needed.
2. Pet Urine Damage
Dog urine creates circular brown patches with a darker green ring around the outside.
Why that happens:
Nitrogen in urine burns the center, while diluted nitrogen around the edges stimulates growth.
This damage can look very similar to disease or grub damage — but treatment is different.
- Minor damage: Flush with water and monitor
- Severe damage: Remove dead turf and patch or sod
3. Soil Compaction from Snow & Ice
After a long winter with heavy snowfall, lawns can develop compacted areas — especially:
- Near sidewalks and driveways
- Where snow piles sat
- In high foot-traffic areas
Compacted soil prevents roots from getting oxygen and nutrients. The result? Circular or thinning patches that struggle to green up.
Solution: Core aeration (not spike aeration) to relieve compaction and improve root growth.
4. Salt Damage Along Driveways
If the circular patches are near pavement, de-icing salt may be the culprit.
Salt:
- Dehydrates grass
- Alters soil chemistry
- Prevents normal growth
These areas often require soil flushing, repair, or partial sod replacement.
5. Actual Grub Damage (Less Common Than You Think)
Grubs feed on grass roots, causing:
- Soft, spongy turf
- Grass that lifts easily like carpet
- Irregular brown patches
The key sign? You’ll see grubs just below the soil surface.
In early spring, most visible circular patches are not from active grub feeding — that typically shows up later in summer or early fall.
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