Spiders in Idaho

Idaho has 12 unique spider species of which the brown recluse and the black widow are considered the most dangerous. The hobo that was detected here for the first time during the 1960s commonly thrives throughout the country, though its level of toxicity to humans remains a topic of debate.

Common spiders: Hobo (Eratigena agrestisI), Cat-faced (Araneus gemmoides)

Largest spider: Hobo (Eratigena agrestisI)

Spiders in Idaho Identification Chart

Highly Venomous Spiders


Cobweb (Theridiidae)

Less Venomous Spiders

Orb-weaver (Araneidae)

Jumping (Salticidae)

Cobweb (Theridiidae)

Prowling (Miturgidae)

  • Long-legged Sac (Cheiracanthuim mildei)

Funnel Weaver (Agelenidae)

Ground (Gnaphosidae)

  • Sergiolus montanus

Wolf (Lycosidae)

  • Trochosa ruricola