The most reliable way to keep ground squirrels out of a garden is a combination of physical barriers, habitat changes, and targeted trapping. No single method works perfectly on its own, but layering several approaches gives you the best shot at protecting your plants long-term.
Ground squirrels are persistent, active during daylight hours (mostly midmorning through late afternoon), and they do real damage. They eat vegetables at the seedling stage, gnaw bark off young trees and shrubs, chew through plastic irrigation lines and sprinkler heads, and dig burrow systems that run 5 to 30 feet long and up to 6 feet deep. Their burrow entrances are roughly 4 inches in diameter, so you’ll spot them easily once you know what to look for.
Confirm You’re Dealing With Ground Squirrels
Ground squirrels look a lot like tree squirrels, and people confuse the two constantly. The simplest test: when startled, ground squirrels run for a burrow. Tree squirrels climb the nearest tree or structure and never use burrows. If you see an animal diving into a hole in the ground near your garden, that’s your culprit. Their burrows also distinguish them from gophers, which push up fan-shaped mounds of dirt and rarely come above ground.
Watch for gnawed bark at the base of young trees, missing seedlings, chewed irrigation parts, and fresh dirt mounds with a clean round opening. Burrowing near tree roots can dry them out and even topple small trees, so damage goes well beyond what they eat.
Fencing and Physical Barriers
Hardware cloth (half-inch mesh wire) is the most effective physical barrier for garden beds. Bury it at least 12 inches below the soil surface and extend it 2 to 3 feet above ground. Ground squirrels can climb, so adding a 12-inch outward-angled lip at the top of the fence makes it much harder for them to get over. For individual trees, wrap the trunk base with hardware cloth or sheet metal to prevent bark girdling, leaving room for growth.
Raised beds with wire mesh bottoms are especially effective. Lining the bottom of a raised bed with hardware cloth stops ground squirrels from tunneling up into the growing area from below, while the bed walls provide above-ground protection. This is one of the most reliable setups for vegetable gardens.
Remove What Attracts Them
Ground squirrels settle where they find easy food and safe cover. Cleaning up fallen fruit, spilled birdseed, and garden debris reduces the food incentive. Clearing brush piles, dense ground cover, and rock piles near the garden removes hiding spots. If existing burrows are close to your garden, filling them with soil and compacting it firmly discourages recolonization, though squirrels will sometimes re-dig in the same spot.
Keep grass mowed short in the areas surrounding your garden. Ground squirrels prefer areas where they can see approaching predators, but tall weedy borders provide cover for their travel routes. Removing that buffer zone between wildland and garden makes the trip feel riskier.
Trapping for Active Infestations
When ground squirrels are already raiding your garden, trapping is often the fastest way to reduce their numbers. Live traps sized around 24 by 5 by 5 inches work well. The key to success is pre-baiting: leave the trap doors tied open for two to three days so squirrels get comfortable entering and eating freely. Once they’re taking the bait consistently, set the traps.
Place traps near burrow entrances but not directly in front of them. Setting them several feet away works better because squirrels forage for food and are more likely to enter a baited trap along their travel route. Press the trap into the soil slightly so it sits flat and stable, and stake it down so predators can’t carry it off.
Good bait options include walnuts, almonds, orange or melon slices, peanut butter, oat groats, or fresh garden greens. Pick whatever matches what the squirrels are currently eating in your area. Only leave traps set during daylight hours. Pulling them at dusk prevents you from accidentally trapping raccoons, skunks, or other nocturnal animals.
Be aware that relocation laws vary by state and are often stricter than people expect. In New York, for example, it is illegal to relocate a trapped animal off your property. Many states require similar handling or mandate that a licensed wildlife control operator manage the removal. Check your state wildlife agency’s rules before trapping.
Repellents: Limited but Worth Trying
Commercial repellents can reduce damage but rarely eliminate it. Taste-based repellents containing capsaicin (hot pepper extract) or bitter agents can protect flower bulbs, seeds, and foliage to some degree. They require multiple applications, especially after rain or watering, and their effectiveness varies. Predator urine products (fox or coyote) are sold as perimeter barriers for lawns and gardens. They may cause squirrels to avoid an area temporarily, but they need frequent reapplication and won’t stop a determined, hungry animal.
The bottom line on repellents: they’re expensive over time, none provide complete protection, and most haven’t been rigorously tested. They work best as a supplement to physical barriers, not as a standalone solution.
Skip Ultrasonic Devices
Ultrasonic deterrent spikes are widely sold for ground squirrel control, but unbiased research trials at Montana State University found they do not control, disturb, or displace ground squirrels. Save your money. The same goes for most vibrating stakes and similar gadgets. Ground squirrels habituate quickly to novel sounds and vibrations that pose no real threat.
Plants Ground Squirrels Tend to Avoid
If you’re planning new beds or landscaping near a problem area, choosing plants that ground squirrels naturally skip can reduce conflict. Colorado State University Extension maintains a list of resistant perennials, and some of the most garden-friendly options include:
- Perennials and herbs: Yarrow, bee balm, black-eyed Susan, irises, catmint, thyme, penstemon, sedum, lupine, and blanketflower
- Ornamental grasses: Blue fescue and blue oat grass
- Shrubs: Potentilla, cotoneaster, snowberry, golden currant, and alpine currant
No plant is completely immune, and a hungry squirrel in a bad year will sample almost anything. But ground squirrels strongly prefer grains, nut and fruit trees (almond, apple, apricot, peach, walnut, pistachio), and vegetable seedlings. Surrounding vulnerable crops with resistant plantings can make your garden a less appealing target overall.
Putting It All Together
The most successful approach layers multiple strategies. Start with physical barriers (fenced beds, buried hardware cloth) as your foundation. Remove food sources and cover near the garden perimeter. If squirrels are already established, trap to reduce the local population. Use repellents on specific vulnerable plants as a short-term boost, and choose resistant species where you can.
Ground squirrels are colonial, so once a few settle in, more tend to follow. Acting early, when you first notice burrows or seedling damage, is far easier than dealing with an entrenched colony. A single breeding pair can produce five to eight young per litter, so populations grow fast when left unchecked.