The short answer
- Set traps perpendicular to the wall with the trigger end almost touching it, or in pairs parallel to the wall facing opposite directions.[2][1]
- Use enough traps to finish quickly: for mice, no more than about 10 feet apart where they are active; for rats, a dozen or more in a heavily infested home.[1][2]
- Use a small, pea-sized amount of bait, ideally the food the rodents are already eating.[1][2]
- Put traps inside boxes or out-of-reach spots where children, pets or birds could encounter them.[2][1]
- For rats, leave the baited traps unset until the bait has been eaten, then set them. Mice are less wary and can usually be trapped right away.[3][2][5]
- Check traps every day. Handle dead rodents with gloves, spray them with disinfectant, double-bag them and put them in a covered trash can.[3][4]
Choosing a snap trap
CDC recommends traditional snap traps for getting rid of rodents around the home, and says to buy the right size: mouse traps and rat traps are different.[3]
- Wooden traps: the plain wooden mouse-size snap trap is the cheapest option. ICWDM describes these as simple, inexpensive and sold in most hardware and farm-supply stores.[1][5]
- Plastic and clamshell traps: some people prefer plastic traps because they are easier to set and clean. ICWDM says clamshell-style traps cost more but are easier to set, clean and empty.[1][5]
- Expanded trigger: pick a trap with a wide trigger plate. In research ICWDM cites, rat traps with an expanded trigger caught almost twice as many rats as narrow-trigger traps and lost less bait. You can also enlarge a narrow trigger by attaching a square of cardboard, metal or wire screen that fits just inside the trap's wire bar.[6][1][5]
- Rat traps: UC IPM notes rat traps come in plastic or wood, with larger triggers or bait reservoirs, and that finding good spots may matter more than which style you buy.[2]
- Electric traps: battery-powered electrocution traps cost considerably more than snap traps. They also need enough units, frequent checks and, for rats, pre-baiting. Read the safety guidelines before touching the inside.[1][2]
- Skip glue traps and live traps. CDC advises against both because frightened rodents urinate, which can raise your chance of getting sick.[3]
Where to put traps
Rodents prefer to run along walls and other objects, so set each trap on the floor against the wall with the baited end next to it, forming a T.[3][1]
- Where you see droppings, gnaw marks or damage, especially between shelter and food: along walls, behind objects, in dark corners.[2][1]
- For roof rats, set traps both on the ground and above ground, such as on beams, ledges and shelves; fasten traps with screws or wire so the trigger sits in the runway.[2]
- Mice and young rats often won't set off a rat-size trap, so match the trap to the rodent.[2]
- Good spots CDC lists: behind the stove and refrigerator, in the back of cabinets and drawers, and in attics, basements, crawlspaces, outbuildings and other places without regular foot traffic.[3]
- For mice, set a pair of traps 1 to 2 inches apart to catch mice that jump over the first one. Ledges and the tops of stored materials work too, if children and pets can't reach them.[1]
- For rats set parallel to a wall, use pairs facing opposite directions so a trap meets rats coming from either side.[2]
- Don't put traps directly in front of a hole; ICWDM says that leads to more refusals. Set them across obvious runways instead.[6]
- For roof rats, ICWDM says to put more traps above the floor than on it. In a house, attic and garage rafters near the activity are usually the best spots.[7]
Bait and setting
Use only a little bait on the trigger. With too much, a mouse can take it without springing the trap.[1][2]
- Nuts, dried fruit, bacon or dry pet food work for rats; peanut butter is popular for mice but can pose allergy risks for some people.[2][1]
- Fasten dry bait to the trigger with thread or fine wire so the rodent springs the trap trying to remove it.[2]
- Set the trigger lightly so it springs easily; traps with an expanded trigger plate catch more.[2][1]
- A ball of cotton or dental floss can work as bait for nesting female mice.[1]
- CDC says chunky peanut butter or mutton fat works best on the bait pan. ICWDM also lists marshmallows, hot dog, bacon and nutmeat tied to the trigger, and non-allergenic commercial baits for public areas.[3][5]
- For roof rats, ICWDM lists raisins, prunes, peanut butter, nutmeats and gumdrops, and says these often beat meat or cat food.[7]
- Replace bait that has gone stale; ICWDM says stale bait loses its pull. NPIC suggests trying different foods to find what works.[5][8]
- Read and follow the directions on the trap package before setting it.[3]
Pre-baiting, and why rats get trap-shy
Rats often avoid new traps and baits for days or weeks after they appear; trapping when numbers are low takes less time and effort.[2]
Pre-baiting means baiting traps without setting them, so rats learn the traps are a safe food source. CDC says to set them once you notice the bait is being eaten; UC IPM suggests waiting until the bait has been taken several times; ICWDM says at least once, and suggests leaving rat traps unset for several days.[3][2][6]
It matters because a rat that springs a trap without being caught becomes very hard to trap again. UC IPM says this fear of new objects is thought to be stronger in roof rats than in Norway rats.[2]
House mice and deer mice are less cautious than rats and can often be trapped more quickly. ICWDM still suggests leaving mouse traps unset until the bait is taken once, so fewer mice escape and learn to avoid traps.[3][5]
How many traps, and how far apart
- Mice: house mice seldom go more than 30 feet from their nest and food. UC IPM says to space traps no more than about 10 feet apart where mice are active; ICWDM says no more than 6 feet.[1][5]
- Rats: UC IPM says to place rat traps about 10 to 20 feet apart, and that a heavily infested home may need a dozen or more.[2]
- Not enough traps? If the bait is gone from every trap, UC IPM says to double the number of baited traps and keep doubling until some bait is left untouched, then set them all.[2]
- NPIC says to set many traps with small amounts of bait, put them out early and set extra back-up traps, since some traps will fail.[8]
- ICWDM also recommends mixing baited traps with unbaited "blind" sets placed across runways.[6]
Keeping children, pets and birds safe
- CDC's rule: keep traps and baits out of reach of children and pets.[3]
- Where children, pets or birds could reach a trap, put it inside a box or station or behind a barrier. ICWDM also suggests placing traps under slanted boards or in hard-to-reach spots.[2][6]
- UC IPM says trapping at night cuts down on catching birds. Outdoors, ICWDM notes ordinary snap traps sometimes take birds.[2][7]
- Snap traps hold no poison, so a trapped mouse eaten by a scavenger outdoors carries no pesticide risk.[1]
- Never touch a rodent with bare hands, and wash thoroughly after handling traps.[2]
Checking and resetting traps
- Check traps daily, remove dead rodents right away and reset the traps until activity stops.[3]
- Check the bait every week, refilling or moving it as needed for at least 15 days, and leave traps out longer if rodents remain.[3]
- You're done when nothing has been caught for a week and no new droppings, urine spots or gnawing appear.[3]
- Keep traps clean and working. ICWDM says plastic and metal traps can be scrubbed with hot water and a stiff brush, and that odors from people or dead rats are not known to make rat traps less effective.[6][5]
- ICWDM notes female mice tend to avoid traps that caught dominant males. If your catch is mostly one sex, a family group is probably still around, so keep trapping.[5]
- UC IPM says rat traps can be left set indefinitely in places like attics where rats have been a problem before.[2]
Removing and disposing of dead rodents (CDC steps)
CDC says to take precautions when cleaning up to lower your risk of getting sick, and not to sweep or vacuum droppings or nests, since that can put virus-carrying droplets in the air. Fleas are common on rodents; CDC suggests insect repellent on clothing, shoes and hands while you pick up dead rodents.[4]
- Put on rubber or plastic gloves.[4][2]
- Spray the dead rodent and the area around it with disinfectant, or a fresh bleach solution of 1.5 cups bleach per gallon of water (1 part bleach to 9 parts water), and let it soak for 5 minutes or as the label says.[4]
- To throw out the trap: put the rodent and the trap in a plastic bag, knot it, put that bag inside a second bag and knot it too.[4]
- To reuse the trap: wearing gloves, dip the trap and rodent in a bucket of disinfectant for 5 minutes, hold the trap over a plastic bag, lift the bar so the rodent drops in, then rinse the trap with water and let it dry completely before double-bagging the rodent.[4]
- Put the bag in a covered trash can that is emptied regularly. UC IPM also lists burying dead rats as an option.[4][2]
- Wash your gloved hands with soap and water or disinfectant, take the gloves off, then wash your hands with soap and warm water.[4]
If trapping isn't working
If trapping doesn't clear the problem, CDC says you can consider a poison bait station or professional help. Poison baits must be used according to the label. Trapping still has a role afterward: UC IPM says traps can confirm that a rodenticide program worked.[3][1]
Before trapping, CDC says to check inside and outside the home for how rodents got in and to seal those holes, which prevents new infestations.[3]
Common questions
- What is the best bait for a mouse trap?
- Often the food the mice are already eating. CDC names chunky peanut butter; UC IPM notes peanut butter can be a problem for people with peanut allergies, and that cotton or dental floss works on females building nests. Use only a pea-sized amount.[1][3][2]
- Should mouse traps go against the wall?
- Yes. Set the baited trigger end against the wall so the trap makes a T, because mice and rats run along walls.[3][1][2]
- How long does it take to trap rats?
- Longer than mice. Rats can avoid new traps for several days or even weeks, so pre-bait first. CDC says to keep trapping until nothing is caught for a week.[2][3]
- Can I reuse a snap trap?
- Yes. CDC says traditional snap traps can be reused after soaking the trap and rodent in disinfectant for 5 minutes, removing the rodent into a bag, and rinsing and drying the trap.[4]
- Why not use a live trap and release the mouse?
- CDC advises against live traps. UC IPM says it is illegal to move house mice off the property where they were caught, and that mice moved as far as half a mile can find their way back.[3][1]
Sources
- University of California Statewide IPM Program, “Pest Notes: House Mouse, Publication 7483 (revised July 2025).” ipm.ucanr.edu/legacy_assets/PDF/PESTNOTES/pnhousemouse.pdf (accessed 2026-10-06)
- University of California Statewide IPM Program, “Pest Notes: Rats, Publication 74106 (revised June 2024).” ipm.ucanr.edu/legacy_assets/PDF/PESTNOTES/pnrats.pdf (accessed 2026-10-06)
- U.S. Centers for Disease Control and Prevention, “How to Trap Up to Remove Rodents.” www.cdc.gov/healthy-pets/rodent-control/trap-up.html (accessed 2026-11-10)
- U.S. Centers for Disease Control and Prevention, “Clean Up After Rodents.” www.cdc.gov/healthy-pets/rodent-control/clean-up.html (accessed 2026-11-10)
- Internet Center for Wildlife Damage Management, “House Mouse Damage Prevention and Control Methods.” icwdm.org/species/rodents/house-mice/house-mouse-damage-prevention-and-control-methods/ (accessed 2026-11-10)
- Internet Center for Wildlife Damage Management, “Norway Rat Damage Prevention and Control Methods.” icwdm.org/species/rodents/norway-rats/norway-rat-damage-prevention-and-control-methods/ (accessed 2026-11-10)
- Internet Center for Wildlife Damage Management, “Roof Rat Prevention and Control Methods.” icwdm.org/species/rodents/roof-rats/roof-rat-prevention-and-control-methods/ (accessed 2026-11-10)
- National Pesticide Information Center, “Mice.” npic.orst.edu/pest/mice.html (accessed 2026-11-10)