Why Are Black Widows Nesting So Close Together?

Finding dozens of female black widow spiders nesting within inches of each other outside a workplace break area is certainly alarming. While black widows are typically solitary and territorial, unusual concentrations can occur when environmental conditions create a buffet of prey.

What Attracts Them?

The primary driver is usually outdoor lighting. Bright lights at night draw flying insects—moths, beetles, mosquitoes—which in turn attract spiders looking for an easy meal. When food is abundant, spiders may tolerate closer quarters than normal.

Reducing the Infestation

To discourage the spiders, reduce the insect prey base. Shield or turn off exterior lights at night, or switch to yellow "bug lights" that are less attractive to insects. Removing webs and egg sacs regularly can also help, but addressing the lighting is the most effective long-term solution.

While the spiders are venomous, bites are rare because black widows are reclusive and non-aggressive. Still, exercise caution in the area and consider professional pest management if the problem persists.