Most homeowners assume pests enter through obvious spots — an open door, a torn window screen, or food left out overnight. But in reality, the majority of pest problems in the Coachella Valley start in places you don’t see.

The desert’s unique construction style, use of tile roofing, and warm climate create dozens of hidden entry points that ants, cockroaches, spiders, and rodents use every single day. And because many of these openings are small enough to fit a credit card or pencil, most infestations begin long before the homeowner realizes a vulnerability exists.

Here are the most common hidden access points — and how to block them effectively.

Read more: Why Squishing Ants Can Make Your Infestation Worse

1. Cracks and Gaps in the Foundation

Even hairline cracks provide enough space for ants and spiders to enter. As the EPA notes, many household pests can squeeze through gaps as thin as 1/16 of an inch.

These cracks often form around the base of stucco homes or near irrigation lines where moisture softens the soil.

Fix: Seal any visible cracks with exterior-grade caulk and check annually for new settlement gaps.

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2. Gaps Around Utility Lines and Plumbing

Pests love plumbing. Warmth, moisture, and darkness make it the perfect entry point for cockroaches and ants. According to the University of California’s Integrated Pest Management program, plumbing penetrations are one of the top ways pests enter California homes.

These gaps commonly appear behind refrigerators, under sinks, near the water heater, and behind washing machines.

Fix: Use expandable foam or mesh to seal openings where pipes enter walls.

Read more: The Smell of Cockroaches: What It Means and How to Get Rid of It

3. Roof Tiles and Attic Vents

Tile roofs are popular in the Coachella Valley — and rodents take full advantage. Roof rats can slip under loose tiles, travel along rafters, and enter through attic gaps or vent screens that have torn over time.

Spiders and even pigeons often follow the same paths.

The National Wildlife Research Center notes that rodents only need a gap the size of a quarter to squeeze through.

Fix: Inspect roof tiles annually, secure loose tiles, and check attic vent screening for tears or openings.

Read more: Why Cockroaches Come Out at Night (and What Daytime Means)

4. Garage Doors and Weatherstripping

Garages are one of the biggest entry points — especially in the desert where homes are often built with wide slab tolerances. Even a small gap under the door invites rodents, ants, and roaches inside.

Holiday décor, cardboard boxes, and stored food make garages even more attractive.

Fix: Replace worn weatherstripping and add a metal door sweep to close any daylight gaps.

Read more: What Are the Symptoms of a Black Widow Spider Bite? Coachella Valley

5. AC Condenser Lines and Drain Gaps

Air conditioning units run nearly year-round in the Coachella Valley, and the lines that feed into the home create perfect entry gaps. Roaches, ants, and spiders often follow condensation trails straight into interior walls.

Fix: Seal around AC line penetrations, and ensure the condenser drain remains elevated off the soil.

Read more: What Should I Do If I Find a Black Widow Spider

6. Window Tracks and Sliding Door Frames

These areas collect debris, moisture, and micro-cracks over time. Ants frequently use sliding door tracks as direct highways into kitchens and living rooms.

Fix: Vacuum debris regularly and check for gaps around the track frame.

How to Block These Entry Points for Good

• Use silicone caulk on exterior cracks
  • Install steel mesh behind vent covers
  • Replace worn garage door seals
  • Seal plumbing lines and utility penetrations
  • Repair torn window screens
  • Keep soil and plants at least 6–12 inches away from the home
  • Schedule annual inspections (especially for tile roofs and attics)

Small maintenance steps dramatically reduce pest pressure — and save hundreds in future treatment costs.

Read more: Are Brown Widow Spiders More Poisonous Than Black Widow Spiders

Frequently Asked Questions

Q: How do I know if pests are entering through hidden areas?
A: Look for trails, droppings, grease marks, or activity near utility lines, vents, or cracks.

Q: Are garage gaps really a major source of infestations?
A: Yes. Rodents, ants, and cockroaches often enter through garages before moving deeper inside the home.

Q: Should I seal every crack I see?
A: Any crack large enough for a credit card to fit should be sealed.

Q: Can pests enter through the attic even if I don’t see them?
A: Absolutely. Roof rats and spiders often remain hidden in insulation or rafters until the infestation grows.

Protect Your Home From Hidden Pest Entry Points

Most pest problems start long before homeowners notice — but with the right prevention, you can block the hidden access points pests rely on.

If you want a thorough inspection of your home’s entry points, Frazier Pest Control is here to help. Call (760) 328-6115 or schedule a visit at: 👉 https://frazierpestcontrol.com/