13 Types of Snakes in France, A Species-by-Species Identification Guide

Ask most Americans planning a trip to Provence or the Loire Valley about French wildlife, and châteaux or vineyards come to mind long before reptiles. Yet anyone researching the types of snakes in France will find a surprisingly varied cast of species, from harmless grass snakes that slip into garden ponds to vipers tucked into rocky hillsides. Most visitors never see one, and the few who do rarely have much to worry about.

Compared to the diamondback rattlesnakes and cottonmouths that keep hikers alert across the southern United States, France’s venomous species are smaller, shyer, and responsible for very few serious bites each year. On average, about one person every ten years actually dies as a result of snake bite envenomation in France. This guide walks through all 13 species recognized in current taxonomy, covering identification, habitat, and how dangerous each one really is.

Snake	Venomous	Relative Size	Where It’s Found
Asp Viper	Yes	Small to medium	Hilly, mountainous SW and central-east France
European Adder	Yes	Small	Cooler northern regions
Seoane’s Viper	Yes	Small	Far southwest, open woodland
Orsini’s Viper	Yes (mild)	Very small	High rocky, marshy uplands
Grass Snake	No	Medium to large	Widespread across mainland France
Barred Grass Snake	No	Medium to large	Western France
Viperine Snake	No	Small to medium	Southern France, near water
Montpellier Snake	Mildly	Large	Southern France, dry rocky terrain
Aesculapian Snake	No	Large	Central and southern France
Ladder Snake	No	Medium to large	PACA, Languedoc-Roussillon, Rhône-Alpes
Smooth Snake	No	Small	Most of France except southwest
Southern Smooth Snake	No	Small	Southwest France
Western Whip Snake	No	Medium to large	Most of France except the far north

Before diving into each species, it helps to know the one trick French herpetologists use in the field: the Vipera, meaning adders and vipers, have vertical pupils, while every other snake in France has round pupils. That single detail resolves most identification questions on the spot. For a broader look at snake diversity outside Europe, the snakes found across Africa offer an interesting contrast in how venomous species evolved on a different continent, and the butterflies of France make a good companion read for anyone cataloguing the country’s wildlife.

1. Asp Viper (Vipera aspis)

The asp viper (Vipera aspis) is the most famous venomous snake in France, with a thick body, a zigzag pattern along its back, and coloring that ranges from grey to brown to reddish. It is found mostly in hilly or mountainous regions, and is especially common in the south west and the centre east of France.

Its venom can be dangerous, especially to children or pets, but bites are rare and usually not fatal thanks to modern medical treatment. Americans who know venomous snakes primarily through the various rattlesnake species native to the United States will notice the asp viper delivers a far smaller venom dose and rarely strikes unless directly provoked.

Pro Tip: Vipers can deliver a “dry bite” with little or no venom, but the first move after any suspected viper bite should still be a call to emergency services or a trip to the hospital.

2. European Adder / Common European Viper (Vipera berus)

The European adder (Vipera berus) is less common in France than the asp viper but present in cooler northern areas. It is a small species in terms of size, though it can weigh up to a kilogram, and it ranks among the most venomous snakes in France.

This is the same species commonly seen in the United Kingdom and much of Scandinavia, which explains why it tends to concentrate in France’s cooler, northern latitudes rather than the warmer Mediterranean south. Readers familiar with pit vipers native to colder US states, such as the timber rattlesnakes described in guides to Maine’s snake species, will recognize a similar pattern of cold-adapted vipers keeping to specific regional pockets.

3. Seoane’s Viper (Vipera seoanei)

Seoane’s viper (Vipera seoanei) is one of the country’s least-encountered venomous species. It is a venomous snake, though when it bites its prey it does not always inject venom immediately, which is fairly rare among vipers. It favors warmth and humidity along with places that have a strong presence of rodents, and it is mainly found in the south-west of France, especially in areas with open woodland.

Because its range is so narrow, most French residents outside the far southwest will never encounter one. That kind of geographically restricted distribution has parallels in the US, where niche species covered in guides to Utah’s snake population stay confined to specific desert or canyon habitats rather than spreading nationwide.

4. Orsini’s Viper (Vipera ursinii)

Orsini’s viper (Vipera ursinii), also called the meadow viper, is a small, stocky snake that is venomous and injects its venom into the tissues of its prey. Despite that, it is worth noting that it is the least venomous snake in all of Europe. It is found in high, rocky places with marshes and also takes refuge in the mountains.

Meadow vipers are among the smallest venomous vipers on the continent, but despite their size, they are incredibly feisty when they feel threatened, hissing and striking in defense. Luckily, their venom is probably the least dangerous of the European vipers, although the bite can still be painful and cause internal hemorrhaging. Its scarcity and alpine habitat make it one of the rarest finds for anyone hiking in the high country, similar to the localized mountain species profiled in guides to Montana’s snakes.

5. Grass Snake (Natrix natrix)

The grass snake (Natrix natrix) is a medium-sized snake with dark crossbars or blotches on its back. It is non-venomous and feeds on a variety of small animals, including rodents, lizards, and frogs. Its natural range stretches far beyond France; the species is found across mainland Europe from mid Scandinavia to southern Italy, and on into the northern Middle East and Central Asia.

Grass snakes are among the most frequently spotted species around ponds, compost heaps, and garden edges, making them the closest French equivalent to the harmless backyard colubrids many Americans grew up with, such as the various garter snake species found throughout the United States. Both groups share a preference for damp ground and a diet heavy in amphibians.

6. Barred Grass Snake (Natrix helvetica)

The barred grass snake (Natrix helvetica) was long considered a subspecies of the common grass snake before genetic research settled the question. A 2012 study of genetic data, morphology, and bone characteristics found that it hybridizes only very rarely with the red-eyed grass snake where their ranges meet in southern France, and it recommended raising the barred grass snake to full species status, an arrangement later supported by subsequent genetic studies.

Its range covers Western Europe, including southern Great Britain, which makes it the grass snake most commonly seen by British and, by extension, American expats settling in northern and western France. Because the two grass snake species look nearly identical in the field, most casual observers simply refer to either one by the general “couleuvre” name used locally, similar to how many Michigan snake species get lumped together under generic “garter snake” or “water snake” labels by non-specialists.

7. Viperine Snake / Viperine Water Snake (Natrix maura)

The viperine snake (Natrix maura) is a semiaquatic, non-venomous species that primarily feeds on fish and is predominantly found in southern parts of France, despite its name not belonging to the viper family at all. That name comes from its defense strategy: the viperine snake looks a lot like vipers and even mimics viper defense tactics, curling its body, lowering its head, and hissing.

This mimicry works a little too well. French herpetologist groups report that the viperine snake is responsible for most of the panic calls to the SOS Serpents hotline, even though there is no risk of poisoning if it bites someone. It is typically found in the same areas as the asp viper, which only adds to the confusion for anyone unfamiliar with the difference between round and vertical pupils. Anglers and pond-side hikers who spot species reminiscent of the water-loving snakes covered in guides to Iowa’s snake species will find a similar semiaquatic lifestyle here, minus the venom either way.

8. Montpellier Snake (Malpolon monspessulanus)

The Montpellier snake (Malpolon monspessulanus) is a large, fast-moving snake with a tan or grey body and a distinctive black mark behind the eye. It is mildly venomous but rarely dangerous to humans because it is shy and bites only when threatened, living mainly in southern France, especially in dry, rocky areas.

Despite carrying venom, this species is not considered a threat to humans in France. Its rear fangs lower the risk of venom injection, and the venom itself has low toxicity. Radio-tracking research on individuals displaced by construction work in southern France found home ranges varying between 0.54 and 3.78 hectares for the Montpellier snake, a seasonal pattern that does not reflect the species’ full annual space use. Its speed and appetite for lizards and small mammals put it in a similar ecological niche to the fast-moving desert snakes found across Egypt, several of which are also mildly venomous but pose little real risk to people.

9. Aesculapian Snake (Zamenis longissimus)

The Aesculapian snake (Zamenis longissimus) is a non-venomous snake known for its calm temperament, striking appearance, and unique ecological traits, and it is one of the larger snake species found in France. Its name traces back to Asclepius, the Greek god of medicine, and its likeness has been tied to healing imagery for centuries, a bit of lore that long predates modern herpetology.

It favors old stone walls, ruins, and warm, sheltered woodland edges in central and southern France, where its excellent climbing ability lets it hunt rodents and birds well above ground level. Large, docile, non-venomous colubrids of this kind have few true equivalents among venomous-heavy US snake lists, though the general size and temperament draw loose comparisons to some of the bigger species profiled in guides to rainforest snake diversity, where large constrictors also rely on calm ambush behavior over aggression.

10. Ladder Snake (Zamenis scalaris)

The ladder snake (Zamenis scalaris) gets its name from the ladder-like pattern running down a juvenile’s back, which fades into two parallel stripes in adulthood. It has a slender body and measures between 120 and 160 centimeters, generally living in rocky areas with fairly dense vegetation. This snake has no venom, but it can still bite. It is found in regions including PACA, Languedoc-Roussillon, and Rhône-Alpes.

The species is native to southwestern Europe. A recent radio-tracking study following ladder snakes displaced from a construction site in southern France found that the individuals left artificial refuges immediately after release and never reused them, instead consistently selecting nearby natural shelters, mainly sun-exposed rodent burrows. Their home ranges during the study period varied between 2.86 and 8.79 hectares. That preference for natural cover over man-made shelters mirrors patterns seen in several South Carolina snake species, which also favor undisturbed burrows and leaf litter over artificial structures whenever both are available.

11. Smooth Snake (Coronella austriaca)

The smooth snake (Coronella austriaca) is timid and non-venomous, with both males and females growing between 24 and 30 inches in length. It is distributed throughout most parts of France, though it is either absent or rare in the majority of the southwest region, where it is typically replaced by the southern smooth snake.

The species is commonly found in dense, mature heather, thriving in dry, sandy, or gravelly heathland, often sheltering beneath logs, stones, and other debris in sunny spots. While primarily ground-dwelling, smooth snakes are also known to climb through bushy vegetation. It is the smallest snake in mainland France, growing up to 70 centimeters at most, and it particularly likes dense vegetation.

When threatened, it adopts one of three behaviours: fleeing, secreting a strong-smelling liquid, or playing dead. As its name suggests, its scales are very smooth and flat to the touch, and even while basking, it intertwines among plants to stay camouflaged. Small, secretive colubrids like this have a rough American counterpart in the various milk snake varieties that rely on similarly cryptic habits rather than venom or size to avoid predators.

12. Southern Smooth Snake (Coronella girondica)

The southern smooth snake (Coronella girondica) fills the ecological gap left by its northern relative. In the southwest of France, where the common smooth snake is absent or rare, this species takes over that same niche. It shares the same secretive, ground-dwelling habits, sheltering under rocks and logs in dry, warm terrain rather than the heathland favored further north.

Like the smooth snake, it is non-venomous and rarely bites unless handled roughly, feeding mainly on small lizards and occasionally other snakes. Its range overlaps closely with several other Mediterranean species on this list, including the ladder snake and Montpellier snake, which is why southwestern France supports such a dense concentration of reptile diversity compared to the cooler regions covered in guides to Minnesota’s more limited snake fauna.

13. Western Whip Snake (Hierophis viridiflavus)

The western whip snake (Hierophis viridiflavus), also known as the green whip snake, is an abundant species in France except in the north, along with Italy and adjacent areas including Corsica, Sardinia, and Sicily. Two subspecies are currently recognized: a melanic form and a striped form.

Locally, it is known in French as la Couleuvre verte et jaune, or “the green and yellow grass snake,” and sometimes as la Cinglard. Adults average about a meter in length, with juveniles emerging at 20 to 30 centimeters and adults capable of reaching 1.75 meters; they are fast and agile, climbing easily or vanishing into undergrowth the moment they spot a person, and while not usually aggressive, they put on a fine show of hissing and striking when cornered.

It is non-venomous but can deliver a painful bite and will produce a foul-smelling excretion from the cloaca if handled; juveniles could easily be mistaken for small grass snakes. That speed and temperament put it in the same behavioral category as some of the continent’s fastest colubrids, a pattern also seen among the quick, active hunters covered in guides to Africa’s snake species, where whip snakes and similar genera fill an almost identical ecological role.

Key Insight: Sources differ slightly on the exact tally of French snakes, with some counting around 12 native species and others, including recent taxonomic databases, listing 13 once the barred grass snake’s split from the common grass snake is factored in. Either way, the vast majority of encounters involve non-venomous species going about their business undisturbed.

For anyone hiking, gardening, or simply curious about what shares the countryside in France, the takeaway is straightforward: most snakes in France are non-venomous and pose little threat to humans, though a few venomous species still deserve caution and respect. Venomous species use their bite primarily to catch prey rather than to attack people, and most snakes here are shy and avoid contact whenever possible. Giving any snake space, watching where hands and feet go in tall grass or woodpiles, and knowing the vertical-pupil trick for spotting true vipers covers nearly every practical scenario a traveler or resident is likely to face. Readers curious about how snake diversity compares on other continents can find a useful counterpoint in this overview of reptile species found across India, where a much larger and more venom-heavy snake fauna makes France’s dozen-plus species look positively tame by comparison.