For many Idaho homeowners, spiders are one of the most unsettling pests to discover indoors. While most spider species in the Treasure Valley are harmless, some—such as black widows and hobo spiders—pose serious health concerns. Knowing what to look for and when spiders are most active can help you protect your family and home.
Common Spiders in Idaho
Black Widows: Glossy black with a red hourglass on the underside, these venomous spiders often hide in dark, undisturbed areas like crawl spaces, garages, and sheds. Their bites can cause severe reactions.
Hobo Spiders: Tan to brown with chevron markings, they are fast runners and often mistaken for brown recluse spiders (which are not native to Idaho). They prefer basements, window wells, and cluttered storage areas.
House Spiders & Orb Weavers: Common but generally harmless, these spiders build webs around windows, corners, and outdoor lights to catch insects.
When Are Spiders Most Active?
Spider activity in Idaho peaks in late summer and early fall, when males wander in search of mates. This is the time homeowners most frequently spot spiders indoors. However, some species, like black widows, can remain active year-round if conditions are warm and sheltered.
Risks and Concerns
Venomous Bites: While rare, black widow and hobo spider bites can cause pain, swelling, and medical emergencies.
Infestations: Large populations may indicate a steady supply of insects inside the home.
Webs and Nests: Excessive webbing in garages, basements, or eaves can be unsightly and a sign of a growing problem.
Professional Spider Control Services
At Pestcom, our technicians provide targeted treatments and preventive solutions, including:
Inspection and Identification of spider species and nesting areas.
Interior and Exterior Treatments along baseboards, corners, and entry points.
Web and Egg Sac Removal to reduce populations and discourage re-infestation.
Ongoing Maintenance Plans to keep spiders under control year-round.
DIY methods like sprays and vacuums may temporarily reduce spiders but often fail to address the root cause—other insect activity. Professional service ensures long-term prevention and peace of mind.