Moles cause mostly cosmetic damage to yards, and the damage is usually temporary. They don’t eat your grass or plants. Instead, they tunnel through soil hunting insects, which tears up the surface but also aerates the ground and reduces pest populations. Whether moles are “bad” depends on how much you care about a pristine lawn versus the ecological benefits they provide.
What Moles Actually Do Underground
Moles are insectivores. Their preferred foods are earthworms and white grubs, along with mature insects, spiders, snail larvae, and occasionally small amounts of vegetation. Stomach analyses have found that nearly two-thirds of moles studied had eaten white grubs, with one individual consuming as many as 175. They also eat mole crickets, beetle larvae, and ants, many of which are genuine lawn pests.
A typical acre of land supports only two to three moles at a time, so the damage you’re seeing in your yard is likely caused by just one or two animals. Despite their small numbers, the resulting tunnel networks can be extensive. Moles dig shallow surface tunnels for foraging and deeper passages (8 to 12 inches below the surface) for nesting and raising young.
The Real Damage to Your Lawn
The main problem is visual. Moles push up raised ridges and rounded, volcano-shaped mounds as they burrow. These surface runways cut through turf areas and make a well-kept lawn look messy. The tunneling also dislodges plants and can damage roots by separating them from the surrounding soil, which causes drying. Grass above active shallow tunnels sometimes yellows or dies in strips.
That said, moles don’t chew on roots, bulbs, or grass blades. If you’re finding gnawed plants or eaten vegetables, you likely have voles or gophers instead. Voles are mouse-sized and leave small holes connected by runways through damaged grass they’ve been feeding on. Gopher mounds are flatter on top and fan-shaped, with the hole off to one side, rather than the rounded volcano shape moles leave behind.
The Benefits Most People Overlook
Moles aerate compacted soil naturally by pushing deep soil up to the surface. This improves drainage and allows air and water to reach grass roots more effectively. They also reduce populations of lawn-damaging insects like grubs and mole crickets, acting as a free, ongoing pest control service. If you’re battling grub damage in your lawn, moles are working the same problem from below.
For gardeners willing to tolerate some cosmetic mess, moles can be a net positive. The University of Florida’s agricultural extension puts it simply: the damage is usually temporary, and moles can actually be beneficial.
How to Fix Mole Damage
Repairing mole damage is straightforward. For raised ridges, press the soil back down with a shovel or your feet, then go over the area with a lawn roller or the roller attachment on your mower. For the volcano-shaped mounds, rake them flat or remove the excess soil with a shovel, then compact the area.
After flattening everything, water the repaired spots thoroughly. If you notice sunken areas after watering, lightly rake them and fill with topsoil, then compact again. For patches where grass has died, remove the dead turf, loosen the soil with a rake, and overseed. Keep newly seeded areas moist with light, frequent watering (up to three times daily) until the new grass matches the height of the surrounding lawn. A light application of nitrogen fertilizer during the growing season or a topdressing of compost can speed recovery. For large dead sections, laying sod is the faster option.
Managing Moles If You’ve Had Enough
If the cosmetic damage is more than you can live with, trapping is the most effective control method. Success rates are highest in spring and fall, especially after rain, because moles are active in shallower tunnels during those seasons. In winter and summer, they burrow deeper and are harder to reach. One important detail: don’t crush the tunnels before placing traps, because moles need to travel through them to encounter the trap.
Castor oil repellents offer a less invasive option, though results are modest. Liquid formulations have shown minor effectiveness in repelling eastern moles, reducing activity in treated areas for over 30 days in one study. To work at all, the product needs to be thoroughly watered into the soil. You can make your own by mixing 6 ounces of unrefined castor oil with 2 tablespoons of liquid detergent in a gallon of water, then diluting at 1 ounce per gallon for spraying. One gallon of the diluted mix covers about 300 square feet. Irrigate with half an inch of water before applying and follow up with at least an inch of water afterward. Granular castor oil products have shown less effectiveness than liquid versions.
Live trapping is possible but rarely practical. A relocated mole released nearby will simply resume tunneling in your yard. Nebraska regulations, for example, require release within 100 yards of the capture site, which effectively guarantees the animal returns.
Deciding Whether to Act
For most homeowners, the answer comes down to priorities. If you maintain a manicured lawn and the ridges bother you, trapping or repelling makes sense. If your yard is more functional than decorative, leaving moles alone gives you free soil aeration and grub control with no effort on your part. The tunnels flatten easily with foot traffic and mowing, and grass typically fills back in on its own within a few weeks during the growing season.