IPM Checklist
Chipmunk Damage in the Garden
The short answer
Chipmunks damage gardens mainly by digging up and eating flower bulbs, seeds, and seedlings, and by burrowing around foundations, stairs, and patios where their tunnels can undermine structures.
You can identify their work by the burrow entrance, which is about two inches across with no telltale mound of soil, because chipmunks carry the excavated dirt away in their cheek pouches and scatter it.
The dependable defense is physical exclusion with quarter-inch hardware cloth laid over newly planted bulbs and beds, combined with removing the rock piles, wood piles, and continuous ground cover that give chipmunks shelter.
Be realistic about the limits: taste repellents are expensive and usually do not eliminate damage, and wildlife specialists note most chipmunk damage involves minor loss, so tolerance plus targeted protection of key plantings is often the sensible approach.
Is it really chipmunks?
Chipmunks target the things you plant. The Internet Center for Wildlife Damage Management lists their damage as consuming flower bulbs, seeds, seedlings, bird seed, grass seed, and pet food left in unprotected containers.
Their burrows are a distinctive clue: the entrance is usually about two inches in diameter, and there are no obvious mounds of soil around it, because chipmunks carry the soil away in their cheek pouches and scatter it, which keeps the opening inconspicuous.
That clean, moundless two-inch hole helps separate chipmunk work from moles and voles, which leave raised ridges or soil mounds.
Exclusion: the reliable fix
Because chipmunks are diggers, physical barriers protect plantings better than anything else. The Internet Center for Wildlife Damage Management recommends quarter-inch hardware cloth to exclude chipmunks from flower beds and to cover seeds and bulbs.
- 1Cage the bulbs — Cover newly planted seeds and bulbs with quarter-inch hardware cloth, then cover it with soil, extending the cloth at least a foot past each margin of the planting so chipmunks cannot dig in from the side.
- 2Protect whole beds — For a bed, lay quarter-inch hardware cloth over the planting area, or use galvanized half-inch or smaller mesh where a more durable barrier is needed.
- 3Choose less-tempting bulbs — Where practical, favor bulbs wildlife tend to leave alone, such as daffodils and alliums, over the tulips and crocus that chipmunks prize.
Take away the cover
Chipmunks need shelter close to their foraging, so habitat changes make a yard less attractive. The Internet Center for Wildlife Damage Management advises not stacking firewood against buildings and avoiding continuous ground cover, trees, and shrubs that connect wooded areas to home foundations.
Keeping wood piles, rock piles, and dense low cover away from vegetable beds and foundations removes the hiding and denning spots that let a chipmunk population build near the garden.
Be honest about repellents and tolerance
Deterrents help only at the margins. The Internet Center for Wildlife Damage Management notes that repellents are expensive and usually do not provide 100 percent reduction in damage, so they should be treated as a supplement to exclusion, not a stand-alone cure.
It also frames the scale of the problem honestly: the majority of chipmunk damage involves minimal economic loss, and the case for active control is strongest when they burrow around structures such as stairs, patios, and foundations, where tunneling can threaten the structure's integrity.
For most gardeners that means protecting the bulbs and seedlings that actually get eaten, discouraging burrowing near hardscape, and tolerating the rest rather than chasing a chipmunk-free yard.
⚠ Taste repellents and scent deterrents rarely stop chipmunks completely. Rely on quarter-inch hardware cloth over bulbs and beds for the plantings you care about, and use repellents only as a backup.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Internet Center for Wildlife Damage Management — Chipmunk Damage Prevention and Control Methods — Verifies that the majority of chipmunk damage involves minimal economic loss and that control is warranted mainly when they burrow around structures such as stairs, patios, and foundations; that quarter-inch hardware cloth excludes chipmunks from flower beds and is used to cover seeds and bulbs, with galvanized half-inch or smaller mesh for larger installations; that firewood should not be stacked against buildings and continuous ground cover, trees, and shrubs connecting wooded areas to foundations should be avoided; and that repellents are expensive and usually do not provide 100 percent reduction in damage.
- Internet Center for Wildlife Damage Management — Chipmunk Damage Identification — Verifies chipmunks consume flower bulbs, seeds, seedlings, bird seed, grass seed, and unprotected pet food; that the burrow entrance is usually about two inches in diameter with no obvious mounds of soil because chipmunks carry the soil away in their cheek pouches and scatter it; and that seeds and bulbs covered with quarter-inch hardware cloth should have the cloth extend at least a foot past each margin of the planting.