Where Do Black Widow Spiders Live & How to Get Rid of Spider Infestations in Calistoga, CA

In North America, the black widow spider is one of the most venomous and dangerous spiders. People can usually identify them by their black bodies that feature a red marking, that is generally shaped like an hourglass, on the underside of their abdomen, also known the opisthosoma. Today, we at Hydrex Pest Control of the North Bay Inc would like to elaborate on a few black widow spider facts.

Spiders are Arachnids

As most know, black spiders are not insects but belong to the arachnid family, or part of the animal class arachnida. Unlike insects that have three body segments and six legs, arachnids have two body segments and eight legs.

What Do Black Widow Spiders Look Like?

When compared to the males, the female black widow spider is darker. The male is often dark brown, where the females are usually dark black. Females have the bright red of an hourglass shape on the abdomen and the males do not have the mark. Males are usually half the size of the female and they can grow to about ½ an inch-long body and 1 ½ inch leg span.

Venomous Black Widow Spider Bites

In North America, the black widow spider is the most venomous spider. Generally, the male and young black widows are not considered dangerous to humans. Anyone who is bitten by a black widow should seek medical attention immediately. The venom is especially toxic to elders, children, and those with weak immune systems.

Where Do Black Widow Spiders Live?

Usually, females will build her webs low to the ground. She will often stay in or around her web for the majority of the time after her web is complete. The bright red hourglass warns off predators, since most animals, even birds, can get severely sick from eating them.

Diet of Black Widows

Being carnivorous, black widow spiders eat insects that they catch in their web. Most of the bugs they devour include grasshoppers, flies, beetles, and mosquitoes. The black widow got her name since the females will kill and eat the male spider.

Spider Reproduction Cycle

At a time, the female will lay 100’s of eggs. The mother will spin a cocoon that the eggs sit in until they hatch. After hatching the black widow spiders are independent and only a small percentage typically surviving.

Additional Black Widow Spider Facts

1) Though a black widow will inject a lot less venom than a rattlesnake in a typical bite, the venom from a black widow spider is 15 times more potent than the venom from a rattlesnake.
2) Three years is the typical lifespan of a black widow.
3) Most people do survive, though black widow bites can be fatal to young children.
4) Wasp, praying mantis, and birds are common predators of black widow spiders, though they usually avoid the bright red hourglass of the female.
5) It is in your better interest not to mess with any black spider since all black widows have the red hourglass on their belly.
6) These spiders are nocturnal and prefer dark, undisturbed areas, such as in garages.

Spider Control

Though black widow spiders are not aggressive, they will bite in defense. If you believe you have black widows on the premises, call Hydrex Pest Control of the North Bay Inc.


Hydrex Pest Control of the North Bay Inc.
4685 Scotts Valley Rd.
Lakeport, CA 95453
(800) 760-3028

Hydrex Pest Control of the North Bay Inc.
1120 Industrial Ave
#18 Petaluma, CA 94952
(707) 795-6345


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