Pennsylvania’s diverse landscapes—from river valleys and marshlands to dense woodlands and rural expanses—make it an ideal habitat for a variety of snake species. While most of these snakes are non-venomous and play an important role in controlling rodent populations, the presence of venomous species, like the Eastern Copperhead and Timber Rattlesnake, can raise concerns among locals and visitors. Here are some of the most snake-infested areas in Pennsylvania, and why these regions are particularly prone to high snake populations.
1. Delaware County: A Snake Haven Near the River
Delaware County is one of the top areas in Pennsylvania known for a high concentration of snakes. The Delaware River, running through the county, provides a humid and water-rich environment that is particularly attractive to various snake species. Among the 153 confirmed sightings, the Eastern Garter Snake is the most prevalent, though there have been no confirmed reports of venomous snakes in the river region.
Historically, Delaware County had a more diverse snake population, but habitat destruction and urbanization have led to a decrease in species diversity. Despite these challenges, areas like Hildacy, Rose Tree, and Ridley Creek provide sanctuary for snakes, helping preserve Pennsylvania’s reptilian fauna.
2. Philadelphia County: Urban Snakes and Waterfront Dwellers
Philadelphia County, with its humid subtropical climate, is another snake hotspot. The John Heinz National Wildlife Refuge provides an ideal environment for snakes, and it’s here that you’ll find the highest concentration of non-venomous species such as the Eastern Garter Snake and Dekay’s Brown Snake. These species have become accustomed to urban environments, often being spotted near homes and docks, especially in areas along the city’s bustling waterfronts.
With a total of 597 recorded snakes, Philadelphia’s urban setting doesn’t seem to deter the slithering inhabitants. While these snakes are generally harmless, experts recommend homeowners seal any gaps and maintain short vegetation to reduce the chances of snake encounters. Despite their presence, snakes in this region play a valuable role in keeping rodent populations under control.
3. Lancaster County: Ideal Habitat for Water Snakes
Lancaster County, located along the Susquehanna River, offers a perfect environment for water snakes. Species like the Northern Rough Greensnake and Northern Watersnake thrive here, enjoying the moist and humid climate. The Copperhead, Pennsylvania’s only venomous snake in this region, is also found in Lancaster County.
This area has witnessed a decline in snake populations, with only 25 new snake records added this year out of the 791 snakes documented in research surveys. Habitat destruction and milder temperatures are some of the contributing factors to this decline, making conservation efforts in this region essential to maintaining a balanced ecosystem. Despite the decline, Lancaster County still supports a wide range of snakes, all vital for keeping the local environment balanced.
4. Pike County: Lakes and Marshes Full of Snakes
Pike County is another snake-heavy region in Pennsylvania, especially around Lake Wallenpaupack, where Northern Watersnakes are most commonly spotted. The county’s numerous ponds, lakes, and marshes provide an abundance of hiding spots for these reptiles. While the Northern Watersnake is non-venomous, it has aggressive tendencies and sharp teeth, so wildlife specialists advise caution around these snakes.
In addition to water snakes, Pike County is also home to the venomous Timber Rattlesnake, though reports of bites remain rare. Timber Rattlesnakes tend to avoid humans and are less aggressive compared to other species. However, they can be found in more rugged, hilly areas, and their population seems to be increasing in this region, making it an important area for both snake enthusiasts and those looking to avoid dangerous encounters.
5. Warren County: A Rising Snake Population Along the Allegheny River
Warren County, located along the Allegheny River, is one of the most snake-infested regions in Pennsylvania. The humid continental climate here provides an ideal environment for several species of snakes, including the Northern Watersnake, Eastern Garter Snake, and the elusive Greensnake. The Timber Rattlesnake population in the area has recently increased, with seven sightings recorded in 2023 out of 35 total observations.
Warren County is a hotbed for snake activity, with 1,430 recorded snake sightings across 11 species. This area’s cold-blooded residents are drawn to warm urban spaces, such as wood piles or radiators, where they can warm up. Experts suggest homeowners in Warren County take preventive measures, such as keeping fuel supplies neatly stacked 12 inches above the ground, to discourage snakes from coming too close.
How to Handle Snake Encounters
While snakes in Pennsylvania rarely pose a serious threat, it’s important to take precautions if you come across one. If you encounter a venomous snake, experts advise seeking immediate medical attention, avoiding ice or over-the-counter treatments, and keeping the affected area still and calm until help arrives. Most snake encounters can be avoided by simply respecting their space and maintaining a safe distance.
Conclusion
From the waterways of Delaware County to the woodlands of Warren County, Pennsylvania is home to a variety of snake species. While some areas, like Pike and Warren counties, may have a higher concentration of venomous snakes, most of the species found in Pennsylvania are harmless and play a crucial role in controlling local wildlife populations. With a little awareness and preparation, residents and visitors can safely coexist with these fascinating creatures.
Disclaimer – Our editorial team has thoroughly fact-checked this article to ensure its accuracy and eliminate any potential misinformation. We are dedicated to upholding the highest standards of integrity in our content.
