Texas Venomous Snakes: 4 Species, 15+ Subspecies
Texas has 4 groups of venomous snakes. All are pit vipers (heat-sensing pits between eye and nostril) except the coral snake, which is an elapid (fixed front fangs). Knowing the difference between these species and their harmless look-alikes is the most practical snake safety skill for Texas residents.
The 4 Venomous Groups — Quick Identification
🐍 Copperhead (Agkistrodon contortrix)
Appearance: 24-36 inches. Copper-colored head (unmarked). Hourglass-shaped crossbands on body — narrow on top, wide on sides. Juveniles have a bright yellow tail tip used as a lure. Range: Eastern and Central Texas — absent from Trans-Pecos and most of Panhandle. Habitat: Wooded areas, rocky hillsides, suburban gardens. Most commonly encountered venomous snake in Texas suburbs. Venom: Hemotoxic — painful but rarely fatal to healthy adults. Most copperhead bites are "dry bites" (no venom injected). Key ID trait: Copperhead crossbands are shaped like an hourglass or Hershey's Kiss — narrow on the spine, wide on the sides. No other Texas snake has this pattern.
🐍 Harmless Look-Alike: Eastern Hog-Nosed Snake (Heterodon platirhinos)
Often mistaken for a copperhead due to similar coloration and pattern. Key difference: Hog-nosed snakes have an upturned snout (like a tiny shovel) and, when threatened, flatten their neck like a cobra and hiss loudly — then play dead by rolling onto their back with mouth open. The defensive display is dramatic and unmistakable once seen.
🐍 Cottonmouth / Water Moccasin (Agkistrodon piscivorus)
Appearance: 30-48 inches. Dark olive-brown to black body. White interior of mouth (displayed when threatened — hence "cottonmouth"). Blocky, triangular head with a dark stripe through the eye. Juveniles have a yellow tail tip like copperheads. Range: Eastern and Central Texas — associated with permanent water. Habitat: Swamps, marshes, ponds, slow-moving streams, drainage ditches. This is the snake most often confused with harmless water snakes. Venom: Hemotoxic — more potent than copperhead venom. Key ID trait: Cottonmouths float with their entire body on top of the water. Harmless water snakes float with only their head above water, body submerged. Also: cottonmouths have vertical (cat-like) pupils; water snakes have round pupils.
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🐍 Harmless Look-Alike: Diamondback Water Snake (Nerodia rhombifer)
The most commonly misidentified snake in Texas. Diamondback water snakes are often killed by people who mistake them for cottonmouths. Key differences: Round pupils (not vertical), slender head (not blocky), body more slender and cylindrical, and they flee into water when approached — cottonmouths often stand their ground. Water snakes have dark chain-like or diamond patterns on a lighter background; cottonmouths are more uniformly dark with faint banding.
🐍 Rattlesnakes (Crotalus and Sistrurus — 9 Texas Species)
Western Diamondback (Crotalus atrox): The most common and largest Texas rattlesnake — 3-5 feet. Diamond pattern on back, black-and-white banded tail. Found statewide except far East Texas. Responsible for the majority of Texas snakebite fatalities. Timber Rattlesnake (Crotalus horridus): Eastern Texas forests. Dark chevron crossbands on gray-brown body. Less common, protected in parts of range. Western Massasauga (Sistrurus tergeminus): Small (18-30 inches), gray with dark blotches. Wetlands and prairies in Central/North Texas. Key ID trait: All rattlesnakes have a rattle (unless broken off). The triangular head with heat-sensing pits between eye and nostril is diagnostic even without the rattle.
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🐍 Texas Coral Snake (Micrurus tener)
Appearance: 24-36 inches. Red, yellow, and black bands completely encircling the body. The rhyme works (in North America only): "Red touches yellow — kill a fellow. Red touches black — venom lack." On a Texas coral snake, red bands touch yellow bands. On the harmless milk snake and scarlet kingsnake, red bands touch black bands. Range: Eastern and Central Texas — pine/oak woodlands. Venom: Neurotoxic — the most potent venom of any US snake, but bites are extremely rare (coral snakes are shy and have small fangs that cannot penetrate shoes or thick clothing). No confirmed Texas coral snake fatality in over 40 years. Key ID trait: Coral snakes have a black head (milk snakes have a red head). Coral snakes have fixed front fangs (not hinged like pit vipers) and must chew to envenomate — a quick strike rarely injects venom.
Texas Snake Bite Statistics & What to Do
| Species | Annual TX Bites (Avg) | Fatalities (Past 20 Years) |
|---|---|---|
| Copperhead | ~200 | 0 |
| Cottonmouth | ~50 | 0 |
| Western Diamondback | ~150 | 2-3 |
| Other Rattlesnakes | ~50 | 1-2 |
| Coral Snake | ~2 | 0 |
If Bitten: Do This, Not That
DO: Stay calm (elevated heart rate spreads venom faster). Remove jewelry near the bite site (swelling). Immobilize the bitten limb below heart level. Get to an emergency room immediately. Call ahead so the ER can prepare antivenin. DO NOT: Apply a tourniquet. Cut the wound and try to suck out venom. Apply ice. Drink alcohol. Try to capture or kill the snake (a photo from a safe distance is enough for identification).
Methodology & Sources: Species descriptions and range maps based on Texas Parks & Wildlife Department herpetological records, iNaturalist Research Grade observations (accessed June 2026), and Dixon & Werler "Texas Snakes: A Field Guide" (University of Texas Press, 4th ed.). Snakebite statistics from the Texas Poison Center Network annual reports and the American Association of Poison Control Centers National Poison Data System. This guide is for educational identification purposes only — it is not a substitute for professional wildlife handling training.