What Causes Small Holes in the Lawn: Mole vs Vole vs Grubs (And How to Stop Them)

What causes small holes in the lawn appearing overnight aren’t just an eyesore—they’re a sign of underground battles between moles, voles, grubs, or even mechanical damage. 🌱 I’ve spent years diagnosing these puzzles, and the key to solving them lies in understanding the culprit first. Moles create volcano-shaped mounds with tiny holes, voles leave irregular tunnels with scattered bite marks, while grubs chew roots, causing patchy dieback.

Here’s the thing—most people jump to pesticides, but that’s often overkill. The real fix starts with lawn health: thick grass naturally deters pests, and proper watering (deep but infrequent) reduces grub habitats.

I’ve found that aerating in spring and fall cuts down on mole and vole activity by disrupting their tunnels. For grubs, a single application of milky spore in early summer can provide 5+ years of protection without harsh chemicals.

You’ll know you’ve won when your lawn stops looking like a golf course hazard. The grass fills in smoothly, and those pesky mounds disappear. The secret? Prevention—healthy soil, proper mowing height (3–4 inches), and regular inspections.

I’ve seen lawns go from Swiss cheese to lush in just two seasons with these simple tweaks.

Now, don’t skip the manual checks—especially in spring and fall when activity peaks. Grab a flashlight after dark and peek under those holes. You might spot the culprit (or at least its evidence) and act before the damage spreads.

This is how you turn a frustrating lawn problem into a foolproof maintenance routine.

Hidden Culprits Behind Lawn Holes

Small holes in your lawn aren’t just an eyesore—they’re a sign that something is actively digging beneath the surface. Understanding the why behind these holes is the first step to reclaiming your grass. Below, we break down the most common causes, backed by science and actionable insights.

Moles are the most notorious lawn destroyers, creating intricate tunnel systems just 3–6 inches below the soil. Their goal? Hunting for grubs, worms, and insects—not eating grass. Here’s how it happens:

• Tunnel collapse: Moles dig shallow tunnels (often near the surface) that can burst when disturbed, leaving small, irregular holes. These tunnels are usually 1–2 inches wide and follow a winding path.
• Mound-building: While moles don’t create classic "voles" (piles of dirt), their digging can push soil upward, forming volcano-like mounds (often 6–12 inches wide) where tunnels intersect the surface.
• Seasonal triggers: Mole activity peaks in spring and fall when insect populations (their food source) surge. Warm, moist soil also softens, making digging easier.

🔍 Pro Tip: Look for freshly turned soil or worm casts (small piles of castings) near holes—moles rarely bring soil to the surface like voles do. Instead, they push it aside.

Unlike moles, voles (small rodents) create holes by feeding on grass roots and stems from above ground. Their damage is often mistaken for mole work, but the mechanics—and fixes—are different.

• Root gnawing: Voles chew through grass roots at the crown (where the blade meets the soil), causing patches to pull up easily. This leaves small, jagged holes (1–3 inches wide) with no visible tunnels.
• Runway systems: Voles create shallow trenches (1–2 inches deep) along fence lines, property edges, or under dense ground cover. These paths can collapse, mimicking mole holes.
• Seasonal patterns: Vole activity spikes in winter and early spring when food is scarce. They also thrive in wet, compacted soil, which makes grass roots easier to access.

💡 Key Difference: Vole holes often have chewed grass stubble or fecal pellets (pea-sized, dark) nearby. Moles leave no debris—just tunnels and mounds.

White grubs (larvae of beetles like Japanese beetles or June bugs) are the unseen culprits behind many lawn holes. They munch on grass roots from below, weakening the turf until it dies in patches—often leaving behind small, spongy holes when stepped on.

• Root decay: Grubs feed on root hairs and shallow roots, causing grass to lift easily (like pulling up a carpet). The holes are usually 1–4 inches wide and appear in irregular clusters.
• Life cycle timing: Grubs hatch in late spring/early summer and peak in July–August. By fall, they pupate into beetles, but the damage lingers until new roots grow.
• Soil conditions: Grubs thrive in moist, well-aerated soil with high organic matter. Overwatering or thatch buildup can worsen the problem by protecting them from predators (like birds).

🔥 Red Flag: If you lift a patch of grass and see C-shaped, white grubs (up to 1 inch long) clustered near the roots, that’s your answer. A healthy lawn should have fewer than 5 grubs per square foot—any more means treatment is needed.

Not all lawn holes come from critters. Sometimes, the culprit is environmental or human-related:

• 🌪️ Soil erosion: Heavy rain, poor drainage, or compacted soil can wash away topsoil, leaving behind pockmarked depressions. Look for holes in sloped areas or near sidewalks/driveways.
• 🪓 Lawn equipment damage: Mowers, aerators, or even pet claws can create tiny punctures that expose roots to disease or drought.
• 🍄 Fungal activity: Certain fungi (like Laetisaria fuciformis) cause fairy ring disease, which can create ring-shaped holes as the fungus decays grass roots.
• 🐛 Ants or beetles: Some species (like harvester ants) dig shallow nests that collapse, leaving 1–2 inch holes with tiny soil crumbs around the edges.

✨ Quick Test: Fill a hole with water—if it drains too fast, you’re dealing with poor drainage or erosion. If it stays, suspect root damage (grubs/voles).

How to Fix Lawn Pockmarks Fast

Now that you’ve identified the culprit behind those pesky small holes in your lawn—whether it’s moles, voles, grubs, or even mechanical damage—it’s time to take action! The good news? Most fixes are straightforward, budget-friendly, and won’t require a degree in entomology.

Below, we’ve mapped out practical, step-by-step solutions tailored to each cause, plus prevention tips to keep your grass hole-free for good.

Moles create tunnels just beneath the surface, causing soil to puff up or collapse into small, random holes. Here’s how to evict them for good:

🍳 Step 1: Confirm It’s Moles (Not Voles!)

• Dig a test hole: Moles leave raised tunnels (not surface holes). If you see puffs of soil or squiggly ridges, it’s moles.

Voles leave surface holes (like tiny volcanoes) and chewed grass. - Look for molehills: Classic mole mounds are 1–2 inches tall, often in wet or soft soil.

👨‍🍳 Step 2: Use Natural Repellents

Moles hate strong smells and vibrations. Try these DIY fixes: - Castor oil spray: Mix 2 tbsp castor oil with 1 gallon of water and 1 tbsp dish soap. Spray tunnels and molehills.

Reapply every 3–5 days. - Predator urine: Fox or coyote urine (available at garden stores) confuses moles. Sprinkle near active tunnels. - Plant mole-deterrents: Daffodils, marigolds, or alliums (garlic family) near the lawn edge.

🔪 Step 3: Physical Barriers

• Spike strips: Install plastic or metal mole spikes (available at hardware stores) along tunnels. Pro tip: Drive them 2–3 inches deep to avoid harming roots.
• Hardware cloth: Bury ¼-inch mesh wire 12 inches deep around the perimeter of your lawn.

Moles can’t dig through it.

⏰ Step 4: Traps (Last Resort) If repellents fail, humane traps work best:

• Scissor traps: Place along tunnels with worms or peanut butter as bait.
• Bucket trap: Dig a hole, place a 5-gallon bucket (open side down) with dirt on top, and bait inside.

The mole falls in but can’t escape.

💡 Prevention Tip: Keep your lawn healthy and thick—moles love easy digging in thin grass. Overseed bare spots and water deeply but infrequently to discourage grubs (which attract moles).

Voles create surface holes (often near fences, decks, or garden edges) and chew grass stems. They’re rodents, so you’ll need a different approach:

🍳 Step 1: Identify Vole Damage

• Surface holes: Unlike moles, voles don’t tunnel deep. Look for small, round holes (like a golf ball) with chewed grass nearby.
• Gnaw marks: Voles clip grass stems cleanly, often in a ring pattern.

👨‍🍳 Step 2: Exclude Them with Barriers

Voles can’t climb or jump, so physical barriers work best:

• Hardware cloth: Bury ¼-inch mesh 6–12 inches deep around garden beds, trees, and lawn edges. Extend 1 foot outward from the base of structures.
• Plastic tree guards: Wrap young trees in metal or thick plastic to protect bark.

🔪 Step 3: Set Snap Traps

• Place traps perpendicular to runs: Voles follow predictable paths. Set traps along fence lines or garden edges.
• Bait with apples, sunflower seeds, or peanut butter.

Check traps daily to avoid suffering. - Use multiple traps: Voles reproduce fast—3–5 traps per 100 feet increases success.

⏰ Step 4: Remove Food Sources

• Clean up debris: Piles of leaves, mulch, or wood chips attract voles.
• Store firewood away from your house.
• Avoid thick mulch layers (keep them 2–3 inches deep).

💡 Prevention Tip: Mow high (3–4 inches) to make it harder for voles to nest. They prefer short, weak grass.

Grubs (larvae of beetles) don’t make holes themselves, but their damage weakens grass, making it easy for moles/voles to dig. Here’s how to starve them out:

🍳 Step 1: Confirm Grub Infestation

• Pull up sod: If the roots are eaten away and grubs are fat, white, and C-shaped, you’ve got grubs.
• Check at dusk: Grubs are most active when the soil is moist.

👨‍🍳 Step 2: Apply Beneficial Nematodes

• **Buy Heterorhabditis bacteriophora (a microscopic worm) at garden centers.
• Mix with water and apply with a hose-end sprayer in the evening (they die in sunlight).
• Water lightly afterward to help them move into the soil.

• Milky spore: A natural bacteria that targets Japanese beetle grubs. Takes 1–2 years to establish but lasts decades.
• Imidacloprid or carbaryl sprays: Chemical options (follow label instructions). Best for severe infestations.

• Birds love grubs! Attract robins, skunks, or crows by leaving some grass long and installing a birdbath.
• Aerate your lawn in fall to help beneficial insects (like ground beetles) hunt grubs.

💡 Prevention Tip: Avoid over-fertilizing with nitrogen—grubs thrive on lush, soft grass. Use a slow-release, balanced fertilizer instead.

If your holes are from foot traffic, pets, or equipment, the fix is simple:

• Rake out debris and fill holes with topsoil or compost.
• Tamp down lightly with a garden rake or board to match the lawn level.

• Sprinkle grass seed over the patched area.
• Lightly cover with straw (not mulch) to retain moisture.
• Water gently for 10–14 days until new grass sprouts.

• Designate a play area for kids/pets away from thin grass.
• Use stepping stones on high-traffic paths.
• Avoid sharp tools (like mower blades) that can tear grass.

💡 Prevention Tip: Water deeply but less often to strengthen grass roots. Shallow watering weakens them, making holes more likely.

Final Pro Tip ⚡: Rotate solutions if pests return. Moles might come back after repellents fade—combine methods (e.g., spikes + castor oil) for best results. A healthy lawn is your best defense**—so feed, water, and aerate regularly!

Frequently asked questions