Wolf Spider

What it looks like

• Large, robust, hairy body — looks intimidating
• Two large forward-facing eyes plus six smaller ones (eight total)
• Excellent eyesight and very fast on the ground
• Females carry an egg sac attached to the spinnerets, and later carry babies on their back
• No web — they hunt actively

Where you'll find it

• Basements, garages, and ground-level rooms
• Window wells, foundation gaps, and walkout doors
• Outside under landscape rocks, mulch, and woodpiles
• Tall grass and leaf litter against the foundation

Behavior & biology

Wolf spiders are solitary hunters. They don't build webs — they chase down prey using superb vision and speed. Most Iowa wolf spiders live outdoors but wander indoors in late summer and fall, especially through walkout basements. They prey on other insects and even small spiders. Females are devoted mothers — they carry their egg sac and then their newly hatched young on their backs for several weeks.

Iowa activity calendar

Signs of an infestation

• Large fast spider running across the basement or garage floor at night
• No web (they hunt actively)
• Multiple sightings in a short period after a cold snap

Health & property risk

Wolf spider bites are extremely rare — they flee rather than bite. A bite (if it happens) is similar to a bee sting: localized pain and redness for a day or two. No medical concern.

How we treat it

1. 1

   Seal entry points

   Wolf spiders come in through gaps under doors, window well covers, and foundation cracks. Sealing these is the most effective long-term step.

2. 2

   Perimeter residual + IGR

   We apply a residual insecticide barrier 3 ft up and out from the foundation, with focus on walkout basements and garage thresholds.

3. 3

   Reduce yard harborage

   Move woodpiles away from the house, trim foundation plantings, and replace mulch with rock in problem areas.

Why DIY usually fails

Kill the one you see — they're solitary and the next sighting is a different individual. A door sweep on the walkout basement door does more than any spray.

FAQ