10 Ways to Keep Mice Out of Your Garden Shed

In Ontario's four-season climate, winter sends mice seeking shelter in sheds. Poisons and traps alone fail if the shed itself invites them. You must eliminate food, nesting material, and entry points—then make the environment hostile. Here's a 10-step defense plan.

1. Inspect Everything Before Storing

Mice hitchhike in stored items. I once found a mouse inside a folded patio umbrella. Check planters, garden furniture, grass catchers, under mowers, pond supplies. My mother brought a mouse indoors in a summer houseplant's soil—took weeks to catch. Sweep mowers clean of old grass. This is your first line of defense.

2. Use Metal Containers for Seeds

Mice chew through thick plastic. Invest in metal containers with tight lids for bird seed, grass seed, veggie seeds (especially corn), flower seeds, bulbs. Transfer bagged seed immediately; clean spills.

3. Remove All Potential Bedding

Newspapers, paper bags, grass clippings, cushion covers, padding—all become nests. Recycle end-of-season paper. Store bulbs in tins, not paper bags. Sweep dust, debris, old clippings. My sister-in-law's truck manual became a mouse nest in her glove box—they're nesting geniuses.

4. Seal Gaps and Holes

Caulk holes around windows, wall bases. If you can see daylight, a mouse fits. My old wooden shed has more holes than walls—I focus on making entry difficult.

5. Make It Uncomfortable

Combine with above: cut food, remove bedding, block entry, then add deterrents: peppermint oil, dryer sheets, mothballs, used cat litter.

6. Peppermint Oil

Concentrated oil on cotton balls placed in corners, along floors, on shelves.

7. Scented Dryer Sheets

Fresh sheets on floors, corners, shelves. Combine with peppermint oil.

8. Mothballs

Effective but toxic to handle and strong-smelling. Also deter moths.

9. Used Kitty Litter (My Favorite)

Gross but brilliant. My garbage with used litter never gets torn open by critters. Place open baggies in each corner, or poke holes in tied bags. Mice flee. Used by vintage car owners for storage. Air out and remove in spring.

10. Commercial Natural Repellents

If DIY isn't appealing, buy natural, less offensive (to humans) products mice hate. Be proactive: cut food, housing, and comfort—they'll move on.