Yellow Sac Spiders - School IPM - USU Extension

    Yellow Sac Spiders

    Cheiracanthium spp.

    Yellow Sac Spider

    Adult yellow sac spider (Joseph Berger,

    Sec Spiders

    Newly hatched yellow sac spiders (Joseph Berger,

    Sac spiders

    Sac spider eggs (Joseph Berger,


    • yellowish coloration
    • ends of legs with brown-to-black tufts of hairs that look like socks

    Nesting Habits

    • found indoors and outdoors
    • under bark, rocks, leaf litter, in rolled leaves, etc.
    • behind or in clutter/storage
    • often make a silk, saclike retreat where walls meet other walls or ceilings, or other hidden places; they spend the day in the sac and hunt at night
    • easily climb slick surfaces


    • insects and spiders


    • could be a nuisance pest indoors
    • not known to be a health hazard, but can aggressively bite when trapped against the skin
    • painful bite
    • beneficial

    IPM Recommendations

    • Minimize nesting habitat around property.
    • Seal exterior cracks and crevices.
    • Install tight-fitting door sweeps at the base of all exterior doors.
    • Install tight-fitting screens in windows.
    • Keep windows closed.
    • Vacuum individuals and silk retreats in buildings.
    • Step on or smash individual spiders that enter.
    • Catch and release (with a glass jar) spiders found indoors.
    • Change exterior lighting to sodium vapor bulbs.

    Additional Resources:

    Yellow Sac Spiders fact sheet

    IPM for Spiders: Integrated Pest Management in Sensitive Environments (University of Nebraska-Lincoln Extension)