Moles mainly eat earthworms, grubs, beetle larvae, ants, and other soil-dwelling invertebrates. Knowing where those foods are likely to be can narrow your search, but it cannot choose a trap location by itself. The final set point should be a confirmed active tunnel that the mole continues to use.

Picture a common October scene. After the first useful fall rain, a homeowner notices several new ridges in the backyard. He sets a trap beside the largest mound, but nothing happens. A day later, fresh tunneling appears on the irrigated side of the lawn.

The mistake was not a lack of effort. It was treating two different questions as if they were the same: Where might a mole search for food? and Which tunnel is it using now?

What Do Moles Actually Eat?

Moles mainly hunt animals that live in soil. Their food can include:

• Earthworms
• White grubs and beetle larvae
• Ants
• Centipedes
• Other small soil invertebrates

This helps explain why moles are often associated with moist, loose soil that supports underground prey. UC Statewide IPM lists earthworms, insects, and other invertebrates among their foods, while Iowa State University Extension notes their association with moist, well-drained soil containing soft-bodied invertebrates.

Mole tunneling can loosen roots, lift turf, and reduce root-to-soil contact. That damage may make the lawn look as if something has eaten the grass, but moles do not primarily feed on grass roots. Much of the visible damage comes from excavation.

How Do Moles Find Food Underground?

Moles find food by moving through underground tunnels and relying on sensitive touch and smell rather than eyesight. Shallow feeding tunnels take them through soil where earthworms, insect larvae, and other small soil invertebrates live. More established routes may also be revisited as the mole searches productive parts of its territory.

Moist, workable soil can bring underground prey closer to the surface, which helps explain why new shallow ridges may appear after rain or irrigation. However, food-rich soil does not prove that every nearby tunnel is still in use. It only tells a homeowner where to begin looking. Virginia Tech notes that moles use smell and continually create or maintain tunnels while extending their search for food.

How Diet Clues Help You Search

Diet clues are useful for deciding where to look first, not where to set immediately.

Start by inspecting areas such as:

• Lawn sections that became moist again after fall rain
• Irrigated ground that drains without staying waterlogged
• Loose soil with visible recent disturbance
• Edges where turf meets planting beds, shrubs, or trees
• Areas with new ridges or freshly pushed soil

These conditions may support earthworms, larvae, and other underground prey, so they are sensible places to begin looking. However, finding earthworms does not prove that a particular tunnel is active. Food narrows the search. Tunnel activity makes the final decision.

From Food Clues to a Trap Location: A 3-Step Method

Step 1: Identify areas worth inspecting

Look first at lawn sections that recently received rain or irrigation and now show fresh damage. The goal is not to choose a set point yet. It is to reduce a whole-yard search to a few likely activity zones.

Step 2: Look for fresh, connected tunnels

Within those zones, look for:

• New raised ridges
• Dark or damp freshly pushed soil
• Shallow tunnels that continue across the lawn
• Straighter runs connecting different feeding areas
• Sections that rise again after being pressed down

Do not automatically choose the largest mound. A large mound may be old, while a less obvious tunnel that keeps being repaired may offer better evidence of current use.

Step 3: Test, then decide SET or MOVE

Press down a short section of several suspected tunnels and mark each location with a small lawn flag. Check them again later.

• SET: The section rises again or is repaired, indicating possible continued use.
• MOVE: The section remains flat, so test another tunnel instead of setting there immediately.

For a more detailed activity test, read How to Find Active Mole Tunnels.

Why Check the Lawn After October Rain?

Fall rain does not guarantee mole activity, but it can make fresh surface signs easier to find. In parts of the United States that experience a dry summer, autumn rain may soften the upper soil and create conditions in which shallow ridges become more visible.

Those conditions often occur in October, which makes it a useful month to restart lawn checks. The calendar alone is not the signal. Look for three conditions together:

1. Useful fall rain has moistened previously dry ground.
2. New or renewed surface ridges appear.
3. Pressed-down tunnel sections are repaired.

University of Illinois Extension identifies the period after the first fall rains as one useful time to trap. Conditions still vary by region, so a dry October with no fresh tunneling is not a reason to force a set.

A practical October lawn check

1. Inspect new ridges after meaningful fall rain.
2. Check irrigated turf, lawn edges, and borders first.
3. Press down several suspected runs.
4. Mark each test with a small flag.
5. Recheck and set only where activity returns.

Three Diet Myths That Lead to Poor Set Choices

Myth 1: Yellow grass means a mole ate the roots

Mole excavation can lift turf and reduce root contact with the soil. Check for connected raised runs before assuming the lawn damage reveals either the mole's food or its current location.

Myth 2: Removing grubs will always make moles leave

Grubs are only one possible food. Earthworms and other invertebrates may remain available. University of Maryland Extension notes that grub control alone does not necessarily remove a mole problem. Treat a confirmed grub issue for the health of the lawn, but do not use it as a substitute for testing active tunnels.

Myth 3: The largest mound is the best trap location

A mound shows that excavation happened nearby. It does not prove that the same route is still active. Find the connected run, test it, and let repaired activity guide the set.

How to Set a Trap After Confirming Activity

Once a tunnel passes the activity test, check the physical set point. Use the location only when all four conditions are present:

• The tunnel has been confirmed active.
• The trap can enter the soil vertically and remain stable.
• The round trigger plate can sit against the ground.
• Rocks and thick roots will not block the underground jaws.

To install a POLAFLEX Mole Trap, align it vertically over the confirmed active tunnel, insert the jaws into the soil, keep the round trigger plate against the ground, and press the upper pedal down with your foot to complete the set. If the trap leans, the trigger plate remains suspended, or underground obstacles block the jaws, move along the same active run and choose a cleaner set point.

The trap does not replace tunnel confirmation. It supports the next step after the location has passed the activity and installation checks. You can also review the complete POLAFLEX setup guide.

60-Second Food-to-Tunnel Checklist

• Has this area received recent rain or irrigation?
• Is there a fresh ridge or newly pushed soil nearby?
• Did a pressed-down tunnel rise or get repaired?
• Is this a connected run rather than an isolated old mound?
• Are the underground jaw paths clear of rocks and thick roots?
• Can the trap remain vertical and stable?
• Can the round trigger plate sit against the ground?

If activity is not confirmed, keep testing. If the tunnel is active but the installation conditions fail, move along that same run to find a better set point.

Frequently Asked Questions

Do moles eat grass roots?

Moles mainly eat earthworms, insect larvae, and other soil invertebrates. Their digging can lift turf and loosen roots, which may damage grass even when the roots are not being eaten.

Will killing grubs get rid of moles?

Not necessarily. Grubs are only one food source. Earthworms, ants, beetle larvae, and other prey may remain in the soil, so grub control does not replace active-tunnel testing.

Does finding earthworms mean a mole tunnel is active?

No. Earthworms can make an area worth inspecting, but they do not prove that a particular tunnel is in use. Press down a suspected run and check whether it is repaired.

Is October a good time to set a mole trap?

October can be useful when fall rain moistens dry soil and fresh shallow tunneling appears. If the ground remains dry and no new activity is visible, follow the lawn evidence instead of the calendar.

Let Food Narrow the Search and Let the Tunnel Choose the Set

Knowing what moles eat does not tell you exactly where to place a trap. It helps you identify the parts of the lawn that deserve a closer look.

Start with moisture and soil conditions, test which tunnels continue to be repaired, and then make sure the trap can be installed vertically and securely. That process is more useful than chasing every new mound without confirming the run beneath it.

After you confirm an active tunnel, explore the POLAFLEX Mole Trap Collection to compare options for your yard, tunnel coverage, and installation conditions.