The fastest way to get a snake out from under your house is to remove what brought it there: food, shelter, and a comfortable temperature. Snakes don’t move into crawlspaces randomly. They follow mice, rats, and insects into dark, protected spaces that stay cool in summer and warm in spring and fall. Getting rid of the snake means addressing all three draws, then physically excluding it from returning.
Why Snakes End Up Under Houses
Snakes can’t regulate their own body temperature, so they constantly seek environments that help them do it. The gap beneath a house is ideal: shaded and cool during hot months, insulated and warmer than open ground during cooler seasons. Add a rodent population, and a crawlspace becomes a reliable hunting ground with built-in climate control.
Any crack or gap wider than a quarter inch in your foundation, siding, or venting is a potential entry point. Snakes don’t need much room. If mice can squeeze through, a snake can follow. Stacked firewood, rock piles, dense ground cover, and overgrown vegetation near the foundation all create the kind of transitional shelter snakes use to move between the yard and the space under your home.
Cut Off the Food Supply First
Rodent control is the single most effective long-term snake deterrent. If there are no mice or rats under your house, most snakes have no reason to stay. Start with the basics: store pet food and birdseed in sealed containers rather than leaving bags open in garages or sheds. Move bird feeders away from the house, since spilled seed attracts rodents at ground level. If you have an active rodent problem in the crawlspace, snap traps or bait stations placed along walls and near entry points will reduce the population faster than passive measures.
Once the prey base dries up, snakes typically move on within days to weeks. This step alone won’t solve an immediate problem if a snake is already settled in, but skipping it guarantees the problem comes back.
Trapping a Snake in a Crawlspace
If you need the snake out now, trapping is the most reliable DIY approach. Two common options work well in tight spaces.
Glue board traps are widely available at hardware stores and catch snakes without injuring them. Place them along walls and near any gaps where you’ve seen the snake enter or exit. When a snake crosses the board, it gets stuck. To release it humanely after relocating the trap, pour vegetable oil slowly over the snake’s body to dissolve the adhesive. Work the oil gently under the snake with your fingers, freeing the head last, and be careful not to get oil in the snake’s nostrils. The snake will lose a few scales but otherwise be unharmed.
Funnel traps (sometimes called minnow traps) use a wire cage with cone-shaped openings on each end. The snake enters through the wide end of the funnel following bait, typically eggs or a live mouse, but can’t back out once its body expands from eating. You can buy these commercially or make one from hardware cloth with funnel openings about 15 to 20 centimeters in diameter. Place the trap in a spot where you’ve noticed snake activity, ideally along a wall or near a gap in the foundation. Check it daily.
With either method, position traps in the evening. Snakes are most active at dawn, dusk, and overnight during warm months. Relocate any captured snake at least a mile from your property in suitable habitat.
Safety Before You Go Under the House
Crawlspaces are exactly the kind of confined, low-visibility space where accidental snake encounters turn dangerous. Never reach blindly under a house, into gaps, or behind objects. Wear thick, closed-toe boots and long pants. Bring a bright flashlight and sweep it ahead of you before moving forward or placing your hands anywhere.
Snakes rarely strike when you simply walk near them. They almost always strike, however, if you grab or step on them, whether intentionally or by accident. If you see a snake and aren’t sure what species it is, back away and photograph it from a safe distance. University herpetology departments and local wildlife agencies can often identify species from a photo sent by email. Knowing whether you’re dealing with a harmless rat snake or a venomous species changes the calculus on DIY removal significantly.
Seal Every Entry Point
Once the snake is out, exclusion is what keeps it from coming back. Walk the full perimeter of your foundation and look for cracks, gaps around pipes, deteriorated vent screens, and spaces where siding meets the ground. Seal anything larger than a quarter inch. Hardware cloth with small mesh works well over vents and larger openings. Packed soil, mortar, sheet metal, or expanding foam can close gaps in the foundation itself.
Pay special attention to where utilities enter the house, where concrete meets wood framing, and where additions or porches attach to the main structure. These junctions settle and shift over time, creating exactly the kind of narrow gaps snakes exploit. Check around storage sheds and detached garages too, since snakes often use nearby outbuildings as staging areas.
Beyond the foundation, reduce cover within a few feet of the house. Pull mulch back from the foundation wall, trim ground-hugging shrubs, and relocate firewood stacks, compost bins, and rock piles at least 20 feet away. Snakes avoid crossing open, short-mowed ground where they’re exposed to predators.
Snake Repellents Don’t Work
Commercial snake repellents, mothballs (naphthalene), and essential oils are among the most commonly purchased and least effective products for this problem. Research from the USDA National Wildlife Research Center tested essential oils and naphthalene vapors on snakes and found that none produced vapors concentrated enough to make snakes leave an enclosed space. Even when essential oils were sprayed directly as aerosols, results were inconsistent: some snakes reacted, some didn’t, and the quantities needed were so large they posed health risks to the person applying them.
Mothballs scattered in a crawlspace are similarly ineffective and introduce toxic fumes into your home’s air supply. Save your money. Physical exclusion and prey removal are the only approaches with a consistent track record.
When to Hire a Professional
If the snake is venomous, if your crawlspace is too tight to safely enter, or if you’re finding multiple snakes, professional wildlife removal is worth the cost. A standard crawlspace snake removal runs $380 to $600, with venomous species toward the higher end. That typically covers a single visit with trapping or hands-on removal. Some factors that push costs up:
- Under-house inspection: $200 to $400 for a thorough crawlspace assessment
- Multiple snakes: $50 to $150 extra per additional snake
- After-hours or emergency calls: $100 to $300 surcharge
- Exclusion work: $200 to $600 or more depending on property size
- Snake-proof fencing: $7 to $25 per linear foot around the perimeter
Get quotes from at least two or three companies. Confirm they’re licensed and insured, and ask for a detailed cost breakdown before authorizing work. A good wildlife control operator won’t just remove the snake; they’ll identify entry points and recommend exclusion measures so the problem doesn’t repeat. Many offer bundled removal-plus-exclusion packages that cost less than hiring separately for each service.