The 5 Most Dangerous Spiders in Arizona

I've been terrified of arachnids for as long as I can remember. Living in the desert, a place renowned for its unusual spiders, gave me a new way to express this fear.

It turns out that the largest desert spiders, tarantulas, are far less troublesome than some of their smaller cousins. So, which spiders should you worry about in the desert?

The Five Most Dangerous Spiders in Arizona

My fear of spiders has taught me one thing: knowledge is power.

I've learned that knowing when to panic and when to leave a beneficial critter alone because it eats the insects I need to panic about helps. Knowing when to call an exterminator is even better. Here are the most dangerous spiders in Arizona.

5. Black-Footed Yellow Sac Spider

This nocturnal spider is less well-known than some of its more notorious counterparts, but it is still a danger. Its bite can cause localized pain, redness, and swelling.

In Arizona, these spiders are usually found on the leaves of trees and shrubs, but they can also be found in homes or other structures.

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4. Desert Recluse

A close relative of the brown recluse, the desert recluse also has a nasty bite that can cause severe skin damage and affect your nervous system.

These arachnids are rather shy, though, and they don't like to live near humans. These spiders avoid urban areas and would rather live near vegetation or in packrat dens.

READ: Who Wins a Fight Between a Sun Spider & a Scorpion?

The venom of a Desert Recluse is necrotic, so once bitten, the skin around the bite begins to die, and it can take a long time to heal. If you or someone you know is ever bitten by one of these spiders, medical attention may be necessary.

3. Brown Recluse

Often called a Fiddleback spider, this arachnid is known for its violin-shaped markings. These spiders like to live in homes and in buildings. They really like dark or dimly lit locations, and you're likely to find them hanging out in basements, closets, and cluttered areas. 

The brown recluse’s bite can lead to necrotic skin lesions and cause symptoms like fever and chills. If you think you've been bitten, it's essential to seek medical help as soon as possible.

2. Brown Widow

Like the black widow, the Brown Widow spider has an orange hourglass marking on the abdomen's ventral (under) side.

READ: This Deadly Insect is on the Move in Arizona Right Now

A brown recluse is timid and rarely bites humans, but on the occasional times when it does happen, you should see a doctor. The brown widow's venom is less potent than the black widow's, but it can still cause severe pain and discomfort if you're bitten.

1. Black Widow

The deadliest spider in Arizona is the Black Widow. It may be dangerous, but it doesn't go looking for a fight. These spiders typically live in overhanging ledges, woodpiles, under benches or stones, near entrances to abandoned rodent burrows, or around outbuildings.

The famous red hourglass shape on its abdomen makes it easy to recognize the Black Widow. This spider only bites to defend itself, so you want to avoid this possibility, because the Black Widow is one of the most venomous spiders in Arizona.

A bite can cause severe pain, muscle cramps, and difficulty breathing. You should get immediate medical attention if bitten.

The spiders on our list are dangerous but usually only bite when provoked. If you think there’s an infestation, it’s best to leave them alone and hire an exterminator.

Sources: Bird Watching HQ | A-Z Animals | Spider Identifications | Spider anatomy - Wikipedia