Spider Control in Salt Lake City

Hobo spiders and their relatives the grass and funnel weavers build sheet webs with a funnel retreat in window wells, foundation cracks, and garage corners. They are the classic Utah basement spider.

Wolf spiders do not build webs; they hunt on the ground and are the large fast spider that crosses a basement floor at night. Cellar spiders — the long-legged ones in the corner of the garage — are harmless and actually eat other spiders.

Black widows are present throughout the valley in window wells, under deck stairs, in meter boxes, and in stacked landscaping block. They are shy, but they are the one species worth removing carefully rather than casually.

For decades hobo spiders were blamed for necrotic wounds in the Pacific Northwest and Intermountain West. Subsequent research has not supported that, and the CDC removed hobo spiders from its list of venomous spiders of concern in 2017.

Black widow bites are genuinely medically significant and warrant a call to Poison Control. Brown recluse are not established in Utah despite frequent claims — misidentification is extremely common.

The practical takeaway: most spiders in a Salt Lake home are a nuisance, not a hazard, but nobody enjoys sharing a basement with them.

Removing webs and egg sacs from eaves, porch ceilings, window frames, and the foundation line does two things: it removes the next generation, and it makes it obvious whether new activity is occurring after treatment. A single egg sac can hold hundreds of spiderlings.

Spiders do not groom themselves the way insects do and pick up much less residual product from a surface. That is why a service that only sprays and skips the pole de-webbing tends to underperform on spiders specifically. Ask whether de-webbing is included on every visit or only the initial.

Spiders follow insects, and insects follow light. Switch exterior fixtures to warm LED or sodium-toned bulbs, which attract dramatically fewer flying insects than cool white and mercury vapor. Move the light away from the door if you can.

Reduce harborage: stack firewood away from the house and off the ground, clear leaf litter and dense juniper against the foundation, and screen window wells with fitted covers. Window wells are the single most productive spider habitat on the average Utah home.

An initial visit includes a full exterior de-web, residual treatment along the foundation band, eaves, window and door frames, and window wells, plus crack-and-crevice work in the garage and any basement activity areas. Dusts go into wall voids and window well weep gaps where liquids do not reach.

Quarterly maintenance keeps it there. Along the east benches — the Avenues, Cottonwood Heights, Draper, and anywhere backing open foothill ground — many homeowners step up to bimonthly service from July through October, which is when the wandering males show up indoors.