Around Idaho
Conditions vary across the state. Choose your city below, then describe what’s happening around your home or business.
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Local spider information
Spider control in Idaho
Learn what to look for around your property, explore your city, and ask about an inspection or a quote.
Spiders in Idaho: what to know
What to note
Where you see spiders, how long it has been going on, and anything you’ve already tried are the most useful details to mention.
A useful next step
Ask about an inspection, what treatment would involve, and whether follow-up visits are included. You don’t need to identify the problem yourself before getting in touch.
Local research
Spiders in Idaho: what the public record shows
Before you compare quotes, it helps to know which spiders actually live in Idaho, when they are busiest, and what the state figures look like. Everything below links to the agency or university page it came from.
Brown recluse spiders are NOT found in the Pacific Northwest and reports of spider bites from other PNW spider species have not been confirmed as venomous despite research in this area
Brown recluse in the Pacific Northwest
Idaho Extension repeats this because necrotic wounds here are far more often bacterial infections.
University of Idaho Extension, Boundary CountyIdaho is home to at least thirteen unique spider species, with only one (black widow spider) that is medically important to humans
Idaho's medically important spider
University of Idaho Extension's homeowner arachnid guide puts the entire risk on one species.
University of Idaho ExtensionThese spiders can bite but are no longer thought to be poisonous
Hobo spider status
UI Extension also notes 'aggressive house spider' is a mistaken name for the hobo spider.
University of Idaho ExtensionSpider species recorded in Idaho
- Western black widow (Latrodectus hesperus) — 'The black widow spider, Latrodectus hesperus, is the most common harmful spider in California' and 'occur in most parts of California' (UC IPM); 'common in Colorado' (CSU); Lat…
- Hobo spider (Eratigena agrestis) — European funnel weaver 'detected in the Pacific Northwest in 1936', now 'throughout northern Utah' and 'throughout Washington'. Current extension/health stance: not medically si…
When spiders are busiest in Idaho
Native Idaho spiders overwinter as immatures, mature by late summer, and males wander indoors on mating 'walkabouts'; as temperatures drop toward freezing more spiders move in for warmth and shelter (UI Extension).
University of Idaho Extension: brown recluse spiders are not found in the Pacific Northwest, and of Idaho's spiders only the black widow is medically important. House spiders and cellar spiders live indoors permanently and are predators of other indoor intruders.
Rules that apply in Idaho
For context, nationally
Sources: University of Idaho Extension, Boundary County; University of Idaho Extension; CDC/NIOSH; Pest Notes: Spiders (PN 7442); Hobo Spider. Figures are quoted as the source prints them. How we check our sources
Explore Idaho cities
Boise
Semi-Arid Continental · urban setting
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Caldwell
Semi-Arid Continental · suburban setting
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Coeur d'Alene
Humid Continental · suburban setting
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Idaho Falls
Semi-Arid Continental · suburban setting
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Lewiston
Semi-Arid Continental · suburban setting
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Meridian
Semi-Arid Continental · suburban setting
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Moscow
Warm Summer Continental · suburban setting
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Nampa
Semi-Arid Continental · suburban setting
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Pocatello
Semi-Arid Continental · suburban setting
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Post Falls
Humid Continental · suburban setting
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Rexburg
Warm Summer Continental · rural setting
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Twin Falls
Semi-Arid Continental · suburban setting
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Jerome
Semi-Arid Continental · rural setting
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