Missouri is home to a diverse range of snake species, from harmless garden residents to potentially dangerous vipers. This list is designed for outdoor enthusiasts, homeowners, students, and anyone interested in understanding which snakes they might encounter in the Show-Me State. Knowing the types of snakes in Missouri can help you stay safe and appreciate the state’s rich wildlife.
Eastern Garter Snake (Thamnophis sirtalis)
The Eastern Garter Snake is one of the most common snakes in Missouri, recognizable by its distinctive yellow stripes running lengthwise along a dark body. They are non-venomous and often found in gardens, forests, and near water sources. These snakes play a vital role in controlling pests like insects and small rodents, making them beneficial residents of local ecosystems.
Eastern Rat Snake (Pantherophis alleghaniensis)
The Eastern Rat Snake, also called the black rat snake, is a large, non-venomous constrictor that can reach up to 6 feet long. They are excellent climbers, often found in trees or barns, and help keep rodent populations in check. Their shiny black or dark gray coloration with a white or yellow chin makes them easy to identify, and they are generally harmless to humans.
Ring-necked Snake (Diadophis punctatus)
This small, slender snake is easily recognized by its bright yellow or orange ring around the neck and a smooth, shiny back that can be gray, black, or bluish. Ring-necked snakes are harmless and prefer moist woodlands and rocky areas. They feed mainly on small amphibians and insects, contributing to insect control in their habitats.
Prairie Rattlesnake (Crotalus viridis)
The Prairie Rattlesnake is Missouri’s most notable venomous snake, identifiable by its thick body, dark diamond-shaped markings along its back, and distinctive rattle. Found primarily in southwestern Missouri, it prefers dry, open grasslands and rocky hills. While venomous, they generally avoid humans and will only strike if threatened, making awareness and respect essential for safety.
Copperhead (Agkistrodon contortrix)
The Copperhead is a venomous pit viper with a distinctive copper-colored head and hourglass-shaped bands across its body. They are relatively common in Missouri’s deciduous forests and rocky areas. Copperheads tend to be shy and will usually retreat if encountered, but their bite can be painful and requires medical attention.
Western Cottonmouth (Agkistrodon piscivorus)
Also known as the water moccasin, the Western Cottonmouth is a venomous snake found in Missouri’s southern wetlands and streams. Recognizable by its broad head, dark coloration, and white lining around the mouth, it often floats or coils near water. While dangerous, cottonmouths are generally defensive and will only bite if provoked, emphasizing the importance of caution around aquatic habitats.
Blue Racer (Coluber constrictor foxii)
The Blue Racer is a fast-moving, non-venomous snake known for its striking bluish-gray coloration and sleek body. They are active during the day and often found in open fields, forests, and along roadsides. Their agility helps them catch insects and small mammals, and they are considered beneficial for controlling pest populations.
Western Worm Snake (Carphophis vermis)
This tiny, harmless snake is rarely seen, as it spends most of its time underground or under leaf litter. It has a shiny, brown or pinkish body and a pointed tail, resembling a worm—hence the name. Worm snakes help aerate soil and feed on small invertebrates, making them an important part of the underground ecosystem.
Missouri Mud Snake (Farancia abacura)
The Missouri Mud Snake is a rare, non-venomous aquatic snake with a glossy, black and red coloration. It inhabits wetlands and streams, often buried in muddy substrates. Their secretive nature and specialized habitat requirements make them a fascinating, though less commonly seen, species in Missouri’s aquatic environments.
How to Choose
When selecting or identifying a snake in Missouri, consider key factors such as coloration, size, habitat, and behavior. Non-venomous species like the Eastern Garter or Rat Snake are generally harmless and beneficial, while venomous species like the Copperhead or Rattlesnake require caution. Always prioritize safety: learn to distinguish venomous from non-venomous snakes, and avoid handling wild snakes unless trained or experienced.
Frequently Asked Questions
- Are Missouri snakes venomous? Yes, Missouri has venomous snakes like the Copperhead, Cottonmouth, and Prairie Rattlesnake, but most species are harmless.
- How can I tell a venomous snake from a non-venomous one? Venomous snakes in Missouri often have triangular heads, vertical pupils, and pit organs between the eyes and nostrils. Non-venomous snakes typically have round pupils and more slender heads.
- What should I do if I encounter a snake in my yard? Keep a safe distance, do not attempt to handle it, and consider contacting local animal control if the snake poses a threat or if you need assistance with removal.
- Are all snakes in Missouri dangerous? No, the majority of Missouri snakes are harmless and play important roles in controlling pests and maintaining ecological balance.
- When are snakes most active in Missouri? Snakes are generally more active in warmer months from spring to early fall, especially during the daytime and after rain.
Final Thoughts
Missouri’s diverse snake population offers a fascinating glimpse into the state’s rich ecosystems. While some species pose risks due to venom, most snakes are harmless and beneficial, helping control pests and maintain ecological health. Educating yourself about the different types and their behaviors can enhance your outdoor experiences and safety. Respect their space, learn to identify the species, and appreciate their role in Missouri’s natural landscape.
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