Discover the Largest Rattlesnake in Texas

Written by Colby Maxwell
Updated: February 27, 2023
© Audrey Snider-Bell/
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Key Points:

  • The Western Diamondback Rattlesnake is the most common species of rattlesnake found in Texas. They can grow up to 7 feet long and have distinctive diamond-shaped markings on their skin.
  • Rattlesnakes are venomous and can be dangerous to humans. In Texas, the number of reported rattlesnake bites is highest during the summer months when the snakes are most active.
  • Rattlesnakes play an important role in the ecosystem of Texas, as they help control the population of rodents and other small animals.

Texas has always been the home of all things “big.” In fact, the Lone State’s famous saying is “Everything’s big in Texas!” That statement generally holds true for barbeque and land mass, but it also seems true for wildlife.

One of the largest venomous snakes in the entire country lives in Texas and is responsible for some of the most bites of any snake around.

Let’s discover the largest rattlesnake in Texas.

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Are Rattlesnakes Native to Texas?

Great Basin Rattlesnake
Great Basin Rattlesnakes are only between two and four feet long so they aren’t that large but they blend into the surroundings extremely well.

©Matt Jeppson/

Rattlesnakes are a common sight in Texas, but are they native to the state? The answer is yes! In fact, Texas is home to more species of rattlesnakes than any other state in the country.

The Western Diamondback Rattlesnake, which is the most common species of rattlesnake found in Texas, has been present in the state for thousands of years. Native American tribes who lived in Texas, such as the Apache and Comanche, recognized the importance of the rattlesnake in their culture and used its image in their art.

Rattlesnakes are an important part of the ecosystem in Texas, as they help control the population of rodents and other small animals. They also play a role in the food chain, serving as prey for larger predators such as hawks, eagles, and coyotes.

Unfortunately, rattlesnakes in Texas face many threats, including habitat loss and fragmentation due to human development. In addition, many people view rattlesnakes as a nuisance or a danger, leading to the unnecessary killing of these important animals.

What is the largest species of rattlesnake in Texas?

Discover the Largest Rattlesnake in Texas
The western diamondback rattlesnake is the largest in Texas.

©Audrey Snider-Bell/

The largest species of rattlesnake in Texas is the western diamondback rattlesnake, otherwise known as the Texas diamondback.

Texas is home to some of the most diverse wildlife in the United States. Among that diversity are many snakes, many of which are venomous. In fact, Texas has around 15 different types of venomous snakes within its borders. Still, none are as well-known or as prevalent as the western diamondback.

The western diamondback is the largest venomous snake in the state and the second largest in the country. They grow four feet long regularly, although five-foot individuals aren’t all that uncommon. The largest western diamondback recorded was around seven feet long and weighed around 15 lbs.

They get their name from their distribution and their pattern. The diamondback pattern is dusty gray, although some individuals can come in shades of red, pink, or chalk.

Western diamondback rattlesnake: distribution and habitat

Discover the Largest Rattlesnake in Texas
The western diamondback can be found from Arkansas to California and south into Mexico.

©Alexander Wong/

As its name suggests, the western diamondback can be found across the western portion of the United States. It currently has a distribution from central Arkansas to California and as far south as Veracruz, Mexico. It can be found in Arkansas, Oklahoma, Texas, New Mexico, Arizona, Nevada, Utah, and California. Some reported sightings include southern Kansas. In Texas, the western diamondback can be found in the western two-thirds of the state.

Western diamondback is generally found in coastal plains, rocky canyons, gorges, and hillsides. It is quite variable in the type of habitat it resides in, with a range that includes deserts, scrublands, grasslands, and even pine-oak forests.

Is the western diamondback rattlesnake dangerous?

Western diamondback rattlesnake strikinDiscover the Largest Rattlesnake in Texasg
Western diamondback rattlesnakes are responsible for some of the most bites by venomous snakes each year.

©Audrey Snider-Bell/

The western diamondback is one of the most dangerous snakes in the United States. Like all rattlesnakes, they belong to the pit viper family. The heat-sensing pits can identify pit vipers on their snouts that are used for hunting prey through body heat.

Other pit vipers include the copperhead and cottonmouth, although rattlesnakes are the more dangerous of the three. Overall, rattlesnakes are the most deadly in the US by a fatality, although few people die each year from bites.

The venom of the western diamondback is known to contain proteolytic enzymes that destroy tissues in the victim. The result is a hemotoxic venom that mostly affects the blood vessels, blood cells, and heart.

The local symptoms of venom include pain, heavy internal bleeding, severe swelling, severe muscle damage, bruising, blistering, and tissue necrosis. Other bodily symptoms include headache, nausea, vomiting, abdominal pain, diarrhea, dizziness, and convulsions.

Although these snakes are extremely dangerous, proper medical treatment almost always results in total recovery.

Western diamondback rattlesnake: Diet

Discover the Largest Rattlesnake in Texas
Western diamondbacks mostly eat small mammals.

©Audrey Snider-Bell/

Despite its dangerous venom, the western diamondback mostly eats small mammals. Some studies show that small mammals make up 95% of their regular prey. The western diamondback preys on the most common species, including prairie dogs, kangaroo rats, gophers, voles, wood rats, pocket mice, harvest mice, squirrels, jackrabbits, rabbits, and more.

Outside of small mammals, western diamondbacks are known to prey on small birds and reptiles at lower rates. Common species include mockingbirds, quail, owls, larks, whiptails, spiny lizards, geckos, and more.

What is the largest species of rattlesnake in the United States?

Discover the Largest Rattlesnake in Texas
The eastern diamondback rattlesnake is the largest in the United States.


Although the western diamondback is an extremely large and venomous snake, it isn’t the largest! That record belongs to its closely related cousin, the eastern diamondback. The eastern diamondback rattlesnake can be found along the eastern coast, from Louisiana to North Carolina. They are recognized as the largest rattlesnake in the world and the heaviest venomous snake in the United States. On average, they grow between 3-6 feet long, although they have been recorded as upwards of 8 feet long.

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The Featured Image

Western diamondback rattlesnake striking
Western diamondback rattlesnakes have retractable fangs that they replace when they break.
© Audrey Snider-Bell/

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About the Author

Colby is a freelance writer from Charlotte, North Carolina. When he isn't distracted by his backyard birdfeeder, you can find him camping, exploring, and telling everyone around him about what he's recently learned. There's a whole world to learn about and Colby is content to spend his life learning as much as he can about it!

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