The most effective way to keep spiders out of your shed is to eliminate what draws them there in the first place: sheltered hiding spots, insects to eat, and easy entry points. A shed checks every box on a spider’s wish list, with dark corners, undisturbed clutter, and gaps around doors and walls that practically invite them in. The good news is that a combination of sealing, cleaning, and a few targeted deterrents can make your shed far less hospitable.
Seal the Gaps They Use to Get In
Spiders don’t need much space. A gap under a door, a crack where the wall meets the foundation, or a missing piece of weatherstripping is more than enough. Your first job is a slow walk around the shed, inside and out, looking for every opening.
For cracks and small holes, use caulk on fixed joints and flexible sealant on joints that shift with temperature changes. Expanding foam insulation works well for larger gaps around pipes or conduit entries. For vents or openings that need airflow, install hardware cloth with quarter-inch mesh, which is small enough to block spiders and most of the insects they feed on. Check door sweeps and thresholds carefully. The gap beneath a shed door is often the single biggest entry point, and a simple rubber door sweep or threshold seal can close it off.
Pay attention to where the roof meets the walls, too. Sheds often have open soffits or poorly fitted roof panels that create highways for pests. Copper mesh stuffed into irregular gaps holds its shape and resists corrosion better than steel wool.
Cut Off Their Food Supply
Spiders follow the food. If your shed attracts flies, moths, beetles, or mosquitoes, spiders will move in to hunt them. Reducing the insect population around your shed is one of the most overlooked steps, and one of the most effective.
Outdoor lighting is a major insect magnet. If you have a light mounted on or near your shed, switch to a yellow LED bulb. Yellow light falls outside the wavelength range most visible to insects, so it draws far fewer of them. You’ll notice fewer moths circling the bulb at night, and fewer spiders building webs nearby to catch them. Yellow LED bulbs are inexpensive and fit standard outdoor fixtures.
Inside the shed, avoid leaving open bags of birdseed, pet food, or grass seed. These attract grain moths and beetles, which in turn attract spiders. Keep any food products in sealed containers. Standing water from leaks or condensation also draws insects, so fix drips and improve ventilation if the shed runs humid.
Declutter and Switch to Plastic Bins
Spiders love undisturbed clutter. Stacks of pots, piles of old tarps, and especially cardboard boxes create exactly the kind of dark, sheltered spaces where spiders build webs and lay eggs. Cardboard is particularly problematic. It absorbs moisture from the air, creating the damp environment insects prefer. Roaches eat the glue between corrugated layers, silverfish feed on the cellulose fibers, and rodents shred it for nesting material. All of that insect activity draws spiders in. Brown recluse spiders frequently nest inside folded cardboard flaps.
Replace cardboard with heavy-duty plastic bins that have locking latch lids. The latching mechanism compresses the lid against the rim, creating a seal insects can’t penetrate. Bins labeled “weather-tight” with a foam gasket or rubber seal along the lid edge offer the best protection. Store bins on shelving rather than directly on the floor, and leave a few inches of space between them and the wall. This eliminates hiding spots and makes it easier to spot webs early.
Once or twice a year, pull everything out of the shed and sweep it thoroughly, including corners, ceiling joists, and the undersides of shelves. This alone disrupts spider habitat more than any spray.
Remove Egg Sacs Before They Hatch
A single spider egg sac can contain dozens to hundreds of spiderlings, so catching them early prevents a population explosion. Egg sacs are typically small, round or teardrop-shaped, and silky white or tan. You’ll find them tucked into corners, under shelves, behind stored items, or along ceiling joists.
The safest removal method is a vacuum with a hose attachment. Carefully vacuum up the sac, then immediately dispose of the vacuum bag in an outdoor trash bin. If you’re using a bagless vacuum, empty and clean the canister outdoors so spiderlings don’t emerge inside your home later. For sacs you can see but can’t reach with a vacuum, use a broom or long-handled tool to dislodge them, then collect the debris for outdoor disposal. If you spot egg sacs from a species you suspect is dangerous, like a black widow, calling a pest control professional is the safer option.
Essential Oils: What Actually Works
Peppermint oil is the most commonly recommended natural spider repellent, and there is some evidence behind it, though the results are uneven. In controlled choice tests published in the Journal of Economic Entomology, researchers found that brown widow spiders and European garden spiders avoided peppermint oil in more than 75 percent of trials. However, a third species tested (a type of false widow) showed no significant response to it at all. Chestnut extract performed similarly, while lemon oil had little effect on any of the species.
If you want to try peppermint oil, mix about 15 to 20 drops into a spray bottle of water with a small squirt of dish soap to help it disperse. Spray it along door frames, windowsills, corners, and any cracks you haven’t sealed yet. Reapply every week or two, since the scent fades. It’s worth using as one layer of defense, but don’t rely on it as your only strategy.
Perimeter Sprays and Residual Treatments
For sheds with persistent spider problems, a residual insecticide spray applied around the perimeter can help. These concentrated products are mixed with water and sprayed along the base of exterior walls, around door frames, and along window edges. They don’t kill on contact but leave behind a residual layer that remains active for weeks, killing spiders and insects that cross it.
For immediate knockdown of visible spiders or heavy webbing, a pyrethrin-based aerosol spray works as a supplement to the longer-lasting perimeter treatment. Always follow the label instructions for mixing ratios, application areas, and safety precautions, especially in an enclosed space like a shed where ventilation may be limited. If you store food, pet supplies, or children’s toys in the shed, keep them sealed and away from treated surfaces.
Maintenance Schedule That Keeps Them Out
Spider prevention isn’t a one-time project. A simple seasonal routine keeps your shed spider-free without much effort:
- Monthly: Walk the shed with a broom or vacuum and knock down any new webs or egg sacs. Check door sweeps and weatherstripping for damage.
- Spring and fall: Do a full cleanout. Pull everything off shelves, sweep the ceiling and corners, and inspect seals around doors, vents, and the roofline. Reapply perimeter spray if you’re using one.
- After any renovation or landscaping: Check for new gaps. Adding a window, running an extension cord through a wall, or digging near the foundation can create new entry points.
Vegetation touching the shed also matters. Trim back bushes, ivy, and tree branches so they don’t contact the walls or roof. Spiders use overhanging branches and dense foliage as bridges to reach the structure. A clear buffer of 12 to 18 inches between plants and the shed walls removes that pathway and makes perimeter treatments more effective.