Joro Spiders Invade National Parks: What Visitors Should Know

The Great Smoky Mountains National Park has issued a warning to visitors that invasive Joro spiders may be hanging in webs near you. The spiders, native to East Asia, have spread across several U.S. states and can pose a risk to hikers and campers. Here’s what you need to know to stay safe and what to do if you spot one.

Where the Joro Spider Is Heading

Joro spiders (Trichonephila clavipes) are known for their large, golden‑brown webs that can span up to 10 feet. They thrive in warm, humid environments and have been found in parks, forests, and even urban areas. The Great Smoky Mountains National Park is one of the latest hotspots, with officials reporting sightings in multiple trail sections.

How to Spot a Joro Spider

These spiders are easily recognizable by their size and the distinctive “X” pattern on the underside of their abdomen. Their webs are often bright yellow and can be found near water sources, under overhangs, or in dense vegetation. If you see a web that looks unusually large or the spider itself, it’s best to keep a safe distance.

Safety Tips for Hikers and Campers

1. Stay on marked trails. Avoid venturing into dense brush where spiders may hide.

2. Use insect repellent. A good repellent can deter spiders as well as other insects.

3. Wear long sleeves and pants. This reduces the chance of a bite if you accidentally brush against a web.

4. Keep your campsite clean. Remove food scraps and store trash in sealed containers to avoid attracting spiders.

What to Do If You Encounter a Joro Spider

If you see a Joro spider, do not touch it. Instead, observe from a distance and, if possible, take a photo for park officials. If you are bitten, seek medical attention promptly. While bites are rarely serious, they can cause discomfort and allergic reactions in some people.

Reporting Sightings

Park rangers encourage visitors to report any sightings of invasive spiders. You can contact the Great Smoky Mountains National Park visitor center or use the park’s online reporting tool. Early reporting helps officials track the spread and implement control measures.

Learn More About Invasive Species

Invasive species like the Joro spider can disrupt local ecosystems, outcompete native species, and pose health risks to humans. Understanding how they spread and how to mitigate their impact is essential for preserving natural habitats.

For more information, visit the CBS News article detailing the latest developments.

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