Spider Management
Spider Control in Redwood City, CA
101 Exterminators does spider control in Redwood City, and most of the calls come down to one species: the western black widow, Latrodectus hesperus. We are California licensed under SPCB Lic. #9119 and have worked San Mateo County since 2005. Widows want a dry, dark, undisturbed void, and a 1960s Redwood City garage, sub-area or side-yard woodpile gives them exactly that.
Warning Signs
Signs You Need Spiders Service in Redwood City
Interior and exterior spider control treatment targeting known harboring locations — especially dark corners, eave lines, garage interiors, wood storage areas, and crawl spaces. We include physical web removal as part of the service to eliminate existing egg sacs and reduce harborage. Treatment uses residual insecticide applied directly to spider runways and harbor areas rather than broadcast spraying.
Black widow webs — irregular, messy, strong silk webs in dark corners and under objects
Visible black widow — glossy black body with red hourglass marking on underside of abdomen
Webs with egg sacs — round, papery sacs in the web often indicate established nesting
Spider activity in garages, crawl spaces, or outdoor storage areas
High general spider population inside or outside — indicates abundant insect prey for them
Bites of unknown origin — if black widow bite is suspected, seek medical evaluation promptly
How It Works
Our Spiders Process in Redwood City
Every job follows the same methodical approach — no shortcuts, no guesswork. Here is what to expect when you work with us in Redwood City.
Inspection & Species Assessment
We inspect for black widows specifically in high-risk areas: garage interiors, crawl space access points, wood piles, under outdoor furniture, and behind storage. We note severity and locations.
Web Removal
Existing webs (including egg sacs) are physically removed with a web brush. Removing egg sacs is critical to preventing a new generation from hatching in 2–4 weeks.
Residual Treatment
Residual insecticide is applied to baseboards, corners, eave lines, garage interiors, and all identified harborage points — both contact-kill and residual effect.
Ongoing Prevention
As part of a general pest program, spider populations are maintained at low levels through regular perimeter treatment. Standalone one-time treatments are also available.
Why 101 Exterminators
Spiders You Can Count On in Redwood City
Dangerous Species Focus
We prioritize black widow identification and removal, particularly in garages, crawl spaces, and children's outdoor areas where contact risk is highest.
Web & Egg Sac Removal
Egg sacs hold 200–900 eggs. Physically removing them at time of treatment eliminates an entire generation before it hatches.
Combined with Pest Reduction
The best long-term spider control is reducing the insect population that spiders feed on. Our general pest programs address the root food source.
Common Questions
Spider Control FAQs for Redwood City
Where do black widows hide in a Redwood City garage?
Low and undisturbed — in the corners where the slab meets the wall, inside open stud bays, behind stored boxes, under workbenches, and in the rails of a roll-up door. Outside the garage, check meter boxes, irrigation valve boxes, block wall voids, woodpiles and the underside of patio furniture. A widow web is a messy tangle rather than a flat orb, and it usually sits within a couple of feet of the ground.
Do spiders get worse in Redwood City at a particular time of year?
Late summer and early fall are the noticeable stretch. Redwood City goes essentially rainless from May into October, spider populations mature over that dry run, and the first November storms push them toward shelter — which is when people find them in garages and entryways. Egg sacs are most visible in the same window, so web removal at that point takes out more than the spiders you can see.
Will spider treatment hold on a property backing Edgewood Park?
It reduces harborage and the insects spiders feed on, but a property backing Edgewood Park or Pulgas Ridge stays under pressure from the open space next door, so this is maintenance rather than a one-time fix. The measures that hold longest are physical: intact crawl-space vent screens, door sweeps, woodpiles moved off the wall, and exterior lighting that draws fewer night insects to the entryway.
Local Pest Pressure
Common Pests We Treat in Redwood City
Every area has its own pest profile shaped by climate, housing, and geography. These are the pests we see and treat most often in Redwood City — tap any one to learn how to identify it and what treatment involves.
Spider Control · Redwood City
Free Limited Spiders Inspection in Redwood City
CA licensed and insured. Written estimate before any work begins. Same-day response available for urgent situations in Redwood City.