Missouri is home to the eastern mole, a small, powerful burrowing mammal that tunnels through lawns, gardens, and fields across the state. If you’re seeing raised ridges of soil snaking through your yard, you’re almost certainly dealing with this one species. Eastern moles are active year-round, but their shallow tunneling peaks during warm, wet months, which is why Missouri homeowners tend to notice the worst damage in spring and early fall.
What Eastern Moles Look and Act Like
Eastern moles are built entirely for life underground. They’re about 6.5 inches long, weigh 2 to 3 ounces, and have brown fur with a silvery sheen, a pointed nose tipped with orange, and broad, shovel-like front feet webbed to the base of their claws. They have no visible eyes or ears. Their fur is plush and lies flat in any direction, letting them move forward and backward through tunnels without resistance.
They prefer moist, well-drained soil rich in organic matter, which is exactly what a maintained lawn provides. Deep, dry sand and heavy clay are less hospitable. Fencerows, terraces, and grassy knolls are all prime habitat. A single mole can maintain a surprisingly large network of tunnels, and because they’re solitary animals outside of breeding season, the damage you see across your yard may be the work of just one or two individuals.
Why Moles Tear Up Your Yard
Moles have extraordinarily high metabolisms and eat 70 to 80 percent of their body weight every day. Their preferred foods are earthworms and white grubs, followed by other insects, spiders, snail larvae, and occasionally small vertebrates. Stomach analyses have found that nearly two-thirds of moles studied had eaten white grubs, with one individual packing away 175 grubs in a single feeding. They feed day and night, every day of the year, never hibernating.
Their tunneling follows a seasonal pattern. In spring, summer, and fall, they dig shallow surface tunnels just below the grass line to hunt for food. These are the raised ridges that wreck your lawn. In winter, they retreat to deeper, permanent tunnels that can run a foot or more below the surface. Burrowing peaks during warm, wet weather because that’s when earthworms and grubs are most active near the soil surface.
Killing Grubs Won’t Solve the Problem
One of the most persistent pieces of bad advice about moles is that eliminating grubs from your lawn will drive them away. It won’t. While moles do eat grubs, the majority of their diet consists of earthworms, and you can’t (and wouldn’t want to) eliminate earthworms from healthy soil. Research from Purdue University confirms that moles continue to thrive in grub-free lawns because earthworms are always present. Spending money on grub-control insecticides specifically to target moles is a waste.
Trapping Is the Most Effective Control
The Missouri Department of Conservation states plainly that traps are the most effective way to remove moles. Missouri’s Wildlife Code allows property owners to trap or kill damage-causing moles without a special permit.
Three types of mechanical traps dominate the market: scissor-style traps, harpoon-style traps, and in-line (choker loop) traps. Scissor-style traps sit over an active tunnel with their jaws straddling the ridge. In-line traps require you to dig out a short section of the tunnel, place traps facing both directions, stake them down, and carefully backfill with soil to block out light and air movement.
The key to successful trapping is placement. Set traps in long, straight traveling runs rather than the branching, irregular tunnels moles create while actively feeding. To confirm a tunnel is still in use, press it flat with your foot or poke a small hole in it. If the mole repairs the damage within 24 hours, that’s an active run worth trapping. Check your traps at least once a day. If nothing triggers within two days, move the trap to a different active run.
Repellents, Baits, and Sonic Devices
Castor oil-based repellents have shown minor, short-term effectiveness against eastern moles. In one study, a castor oil product reduced mole activity in a treated area for about 30 days. For even that modest result, the product needs to be thoroughly watered into the soil: half an inch of irrigation before applying, then an inch or more of water afterward. That’s a lot of effort for limited, temporary relief, and the moles often simply shift to untreated parts of the yard.
Electronic and ultrasonic devices marketed as mole deterrents have never been proven effective in controlled testing. Save your money.
Bait products shaped like earthworms or grubs tend to outperform traditional grain-based baits, which moles largely ignore because they aren’t grain eaters. Worm-shaped baits containing the active toxin bromethalin (sold under brand names like Talpirid and Tomcat) show more promise because they mimic the mole’s natural food. You place them directly inside active tunnels. Even so, results vary, and trapping remains more reliable for most homeowners.
Best Time of Year to Act
Spring and early fall are the ideal windows for mole control in Missouri. Moles are tunneling closest to the surface during these periods, their runs are easiest to identify, and the moist soil makes traps function properly. In summer heat, moles sometimes tunnel deeper to follow earthworms retreating from dry topsoil, making surface trapping less productive. Winter drives them into their deep permanent tunnels, which are harder to locate and access. If you’re going to invest time in trapping, start as soon as you see fresh surface ridges appear in the spring.