Spiders in Wisconsin

The northern and southern parts of Wisconsin have many spider species of which the northern widow and brown recluse are considered poisonous. The northern yellow sac could also hurt humans, though they are considered as mildly venomous. However, the deadly species do not dwell here in abundance, with the northern black widow being present in just 10 counties. The brown recluse thriving here is also present in minimum numbers.

Common spiders: Common House (Parasteatoda tepidariorum), Giant House (Eratigena atrica), Northern Yellow Sac (Cheiracanthium mildei)

Largest spiders: Giant House (Eratigena atrica), Giant Lichen Orb-weaver (Araneus bicentenarius), members of the Fishing (Dolomedes) and Wolf (Lycosidae) family

Spiders in Wisconsin Identification Chart

Highly Venomous Spiders

Cobweb (Theridiidae)

  • Northern Black Widow (Latrodectus variolus)


  • Brown Recluse (Loxosceles reclusa)


  • Northern Yellow Sac (Cheiracanthium mildei)

Less Venomous Spiders

Orb-weaver (Araneidae)

Jumping (Salticidae)

Nursery Web (Pisauridae)

Cobweb (Theridiidae)


Funnel Weaver (Agelenidae)

Ground (Gnaphosidae)


  • Hammock (Pityohyphantes costatus)

Wolf (Lycosidae)

  • Tiger Wolf (Tigrosa aspersa)
  • Ground Wolf (Trochosa terricola)
  • Tigrosa helluo
  • Trochosa ruricola

Tangle Web (Theridiidae)

  • Common House (Parasteatoda tepidariorum)