Black widow spiders prefer dark, undisturbed areas where they can build irregular webs close to the ground. They are most often found in outdoor environments but may move into garages, sheds, and storage spaces where conditions are similar. 

Homeowners typically do not see black widows frequently, but may notice their webs in corners, under furniture, or in cluttered areas. Because they stay hidden and remain still in their webs, their presence can go unnoticed until activity increases or an area is disturbed. Encounters often happen unexpectedly—such as reaching into storage, moving outdoor items, or cleaning rarely used spaces. These situations are when bites are most likely to occur, as the spider may feel threatened. 

While black widow spiders are not aggressive, their bites can cause significant discomfort and may require medical attention. Because of this, even small signs of activity—such as webs in protected areas—should be taken seriously. If favorable conditions remain, black widow spiders may continue using the same areas, leading to repeated sightings over time.