Snakes under your deck: a simple, trap-free fix to keep them out

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• Why snakes choose the space beneath decks and porches
• How to inspect your deck for snake entry points
• Choose the right materials to seal gaps and holes
  • Tools you’ll likely need
• How to build a durable snake barrier for open decks
• Safety and humane handling before sealing
• Simple yard changes that reduce the chance snakes return

Finding a snake skin near your deck can snap you to attention. Instead of reaching for traps or a pest control call, there’s a simpler, longer-lasting fix: stop snakes from entering in the first place. With some basic inspection and a few common materials, you can block the gaps snakes use as shortcuts and resting spots.

Why snakes choose the space beneath decks and porches

Snakes look for spots that offer food, shade, and protection. Your deck can check all those boxes. Understanding what draws them helps you design a defense.

• Food sources: rodents, insects, and leftover pet food attract snakes.
• Shelter: the cool, dark cavity under a deck is an ideal hideout.
• Microclimate: retained moisture and stable temperatures make the area comfortable.
• Easy access: snakes can squeeze through very small gaps.

Remember: Many snakes can slip through openings as small as a half inch. Blocking tiny cracks matters.

How to inspect your deck for snake entry points

Start with a calm, methodical check. Walk the perimeter and get beneath the deck if it’s safe.

• Look for gaps between boards, around support posts, and at the base where the deck meets the ground.
• Measure the largest spaces between posts if you plan to attach a barrier.
• Scan for rodent burrows, stacked wood, or dense vegetation that provides cover nearby.
• Check the underside for moisture buildup or loose siding that can widen with time.

Choose the right materials to seal gaps and holes

Your deck’s materials determine the best approach. Match sealants and barriers to wood, concrete, or masonry.

• Small cracks in wood: use exterior wood filler or caulk.
• Large voids: attach plywood, lattice, or deck skirting panels.
• Masonry or concrete: apply a concrete sealant or epoxy patch.
• Ground-level gaps: fill with compacted soil, gravel, or a concrete footer if needed.
• Open-sided decks: use tightly woven hardware cloth or wire mesh designed to exclude snakes.

Tip: Avoid chicken wire. Its wide openings and flexibility let snakes through or around it.

Tools you’ll likely need

• Measuring tape and marker
• Exterior caulk or concrete sealant
• Hardware cloth (1/4 inch mesh recommended)
• Staples, screws, or masonry anchors
• Shovel for burying the barrier edge

How to build a durable snake barrier for open decks

A wire mesh barrier is effective for posts or open foundations. Install it carefully to block both ground and climbing access.

1. Cut hardware cloth to span between posts with overlap at seams.
2. Secure the mesh to posts with screws or heavy staples, keeping it taut.
3. Bury the bottom edge at least six inches into the ground to prevent snakes from slipping underneath.
4. Form an outward-facing lip or bend at the top to deter climbing.
5. Ensure the mesh is flush with adjoining structures to eliminate gaps.

For tall or highly trafficked decks, consider adding a durable skirting or lattice backed by mesh. This improves the appearance and strengthens the barrier.

Safety and humane handling before sealing

Do not seal a space without confirming it is empty. Trapping animals under a newly installed barrier is inhumane and risky.

• Visually inspect and, if possible, wait for daylight checks.
• If you spot a snake, keep pets and children away and observe from a safe distance.
• Contact a licensed wildlife removal service for venomous or large snakes.
• Do not attempt to handle a snake unless you have proper training.

Critical: Professionals can relocate snakes safely and advise on the best sealing approach for your site.

Simple yard changes that reduce the chance snakes return

Blocking entry is most effective when paired with basic yard maintenance.

• Keep grass short and trim ground-level shrubs.
• Store wood and debris off the ground and away from the house.
• Secure compost, birdseed, and pet food to avoid attracting rodents.
• Fix leaky spigots or drainage issues that create damp refuges.
• Inspect perimeter fencing and repair any holes or gaps promptly.