How to Get Rid of Mice Outside: Yard and Foundation Plan

The best thing to get rid of mice outside is to take away their food and hiding places: cover garbage, bring in pet food, guard bird feeders, clear brush and junk piles, and raise firewood off the ground. Then trap along the foundation with covered traps and seal the gaps into the house. Repellents and ultrasonic devices do not solve an outdoor mouse problem.

Why Outdoor Mice Matter

A few mice in a field or woodland are normal, but mice living in your yard, under the deck or in a woodpile against the house are a short trip from your walls. They feed on birdseed, pet food, fallen fruit and garbage, then move indoors when the weather turns cold.

A University of Georgia guide to getting rats and mice out of your house and yard calls sanitation the best method of control. That is the core of the outdoor plan: make the yard a poor place to live, and the mice near your house thin out. If mice are already in the roof space, our guide on how to get rid of mice in the attic covers trapping and sealing up there.

What You Need

• Garbage cans with tight lids and a sealed bin for pet food and birdseed.
• A baffle or squirrel guard for bird feeder poles.
• Covered tunnel snap traps or traps placed inside a protective box, so pets and birds cannot reach them.
• Steel wool, caulk and 1/4-inch hardware cloth for gaps in the foundation and vents.
• Gloves and bags for emptying traps and clearing debris.
• Blocks or pallets to raise firewood off the ground.

Most outdoor mouse problems trace back to a handful of yard features. Use this table to spot yours before you start.

How to Get Rid of Mice Outside Step by Step

1. Take away their food. Keep garbage in tightly covered cans, feed pets indoors or pick up uneaten food, and put a baffle on bird feeder poles; clean up spilled seed and fallen fruit.
2. Remove hiding places. Clear old boards, brush piles, rock piles, weeds and junk from around the house and garage.
3. Move and raise firewood. Never pile wood against the house; stack it away from walls and at least a foot off the ground.
4. Trim the edges. Cut back tall grass, dense shrubs and vines along the foundation so mice lose cover next to the house.
5. Set covered traps along the foundation. Place tunnel traps against the house wall, by the garage door and next to burrow openings, where mice travel.
6. Seal the way in. Caulk or cement around pipes and wires, seal gaps under doors, and cover openings with 1/4-inch hardware cloth.
7. Check and close burrows. Check traps every morning; once activity stops, fill burrows with rocks and dirt, and if one reopens, mice are still there.

What Does Not Work Outdoors

Many products sold for outdoor mice promise more than they deliver. The UGA guide is blunt: sound and flashing lights have almost no effect, ultrasound devices are almost completely useless, products labeled as repellents are generally ineffective, and homemade products generally do not work either.

• Repellent sprays, granules and pouches: scents fade outdoors and do not move mice that have food and shelter.
• Ultrasonic stakes and solar repellers: sound does not travel through soil, plants and walls in a useful way.
• Mothballs: not labeled or effective for rodents, and toxic to pets, children and wildlife.
• Glue boards outside: they catch birds, lizards and other wildlife.
• Relying on pets: cats and dogs may catch a few mice but cannot control a population.

The mice in attics and garages section covers the other spaces where outdoor mice end up.

Are Rats Afraid of Humans?

Rats and mice avoid people and are mostly active at night, which is why you see signs far more often than the animals themselves. They are not dangerous in the sense of attacking, but they will bite if cornered or handled, and they spread disease through droppings and urine.

That caution is also why outdoor traps should sit along walls, fences and under cover, where rodents feel safe moving, rather than in open lawn.

It also explains why a neighborhood approach works best. The UGA guide suggests getting together with neighbors when several yards have rodents, so food and cover are removed at the same time and mice cannot simply move next door and return later.

Common Questions About Getting Rid of Mice Outside

Key Takeaways

Outdoor mice stay where there is food and cover. Covered garbage, pet food brought in, guarded bird feeders and a cleared yard take away both, and covered traps along the foundation catch the mice that remain.

Seal the gaps into the house while you work outside, and skip repellents and ultrasonic devices, which do not move established mice. If burrows keep reopening after a few weeks, look for missed food sources or ask neighbors to clean up at the same time.

This weekend, walk the yard, put a lid on every garbage can and move the firewood away from the house.