Formosan Termites in Jacksonville: How to Spot Them and Protect Your Home

Formosan termites in Jacksonville have earned a reputation as one of the most destructive pests a Northeast Florida homeowner can face. They are not native to the area, they build colonies far larger than the termites most people know, and they can attack a home from the soil or from nests hidden inside walls and trees. This guide explains how Formosan termites differ from native termites, how to recognize a swarm, the signs of an infestation, why trees matter, and how to protect your Jacksonville home.

What Makes Formosan Termites Different From Native Termites?

Formosan subterranean termites differ from native Eastern subterranean termites mainly in the size and reach of their colonies. According to the City of Jacksonville’s guidance on termites and trees, Formosan colonies are very large and can forage up to 300 feet. That means one colony can reach several structures and travel well beyond the edges of a single yard.

Formosan termites can also build aerial nests, called cartons, that hold moisture. This lets a colony survive above ground inside a wall, an attic or a tree without staying connected to the soil. Native subterranean termites usually rely on mud tubes that link back to the ground, which makes them easier to trace.

Are Formosan Termites Spreading Across Florida?

Formosan termites are not a short-term problem. A University of Florida study published in 2026, which reviewed termite monitoring records from 1990 to 2025, found that Formosan subterranean termites are now established in most of Florida’s coastal counties and most large urban centers. The researchers judged it highly likely the species will be detected statewide before 2050.

In Jacksonville, Duval County’s UF/IFAS Extension office runs education on identification, prevention and control through the Jacksonville Formosan Termite Task Force. The City of Jacksonville notes that termites can be moved in potted plants, landscape timbers, infested trees and boats, which helps explain how the species travels from place to place.

How Do You Recognize a Formosan Termite Swarm in Jacksonville?

A swarm is often the first sign homeowners notice. Swarmers are the winged reproductive termites that leave a mature colony to start new ones. Formosan swarms in Jacksonville typically happen in the evening, in large numbers, from May to July, and the swarmers are drawn to lights.

If you see a cloud of winged insects around porch lights or windows on a warm evening, or find piles of discarded wings on windowsills the next morning, take note. A swarm inside the home is a strong sign that a colony is nearby. Our guide on what to do if you see termite swarmers walks through the next steps.

Which Signs Point to Formosan Termites Specifically?

Many termite warning signs look the same for every species, but a few point more strongly to Formosan termites. Watch for these:

• Large evening swarms from May to July, with winged termites gathering around porch lights and windows.
• Damage on upper floors, in the attic or far from the foundation, since Formosan colonies can nest above ground.
• Carton material, a hard, mud-like mass packed into wall voids or cavities, which Formosan colonies build to hold moisture.
• Termite activity in nearby trees, such as mud tunnels at the base, in branch crotches or around cut limbs.
• Damage near hidden moisture, such as a roof leak, an air conditioning drain line or a plumbing leak inside a wall.

Only a trained inspector can confirm the species, and samples can also be submitted to the Duval County Extension office for identification. If you see any of these signs, schedule a professional inspection instead of disturbing the area.

Why Do Trees Matter When Formosan Termites Are Nearby?

Trees play a bigger role with Formosan termites than with native species. The City of Jacksonville explains that Formosan termites can eat the centers of live trees and woody plants, and that infested trees can keep supplying termites to a property. A tree that looks healthy from the outside may hold an active colony inside.

The city recommends checking trees for mud tunnels, live termites at the base and in branch crotches, and activity around cut limbs. When trees are infested, both the trees and the home may need attention to reduce Formosan numbers. If you have large trees close to your house, mention them during your termite inspection.

How Are Formosan Termites Treated in Jacksonville Homes?

Effective Formosan termite treatment targets the colony, not just the termites you can see. Paul’s Termite & Pest Control protects Jacksonville-area homes with the Sentricon Colony Elimination System, which is designed to target both Eastern subterranean and Formosan termites. Bait stations are placed in the soil around the home near high-risk areas. Termites feed on the bait and share it through the colony, working to eliminate the colony at its source.

Sentricon uses low-chemical bait technology instead of tent fumigation, so you do not need to leave the home during treatment, and Paul’s Termite & Pest Control backs its termite treatment with a warranty and repair agreement. Learn more about termite treatment in Jacksonville. Technicians at Paul’s Termite & Pest Control are licensed, continually trained and QualityPro certified, and they follow an Integrated Pest Management approach.

How Can You Lower the Risk of Formosan Termites Around Your Home?

You cannot control where Formosan termites forage, but you can make your home a harder target:

• Fix leaks, gutters and drainage so moisture does not collect near the foundation or in the walls.
• Keep mulch, firewood and stored lumber away from the house.
• Remove wood-to-soil contact around decks, steps and fences.
• Inspect landscape timbers and large potted plants before bringing them onto the property.
• Have trees near the home checked for termite activity.
• Schedule regular professional termite inspections.

Frequently Asked Questions

Are Formosan termites in Jacksonville?

Yes. Formosan subterranean termites are present in Jacksonville, and Duval County’s UF/IFAS Extension office runs education on them through the Jacksonville Formosan Termite Task Force.

When do Formosan termites swarm in Jacksonville?

Formosan swarms in Jacksonville typically happen in the evening, in large numbers, from May to July. Swarmers are attracted to lights, so look around porch lights and windows.

How far can a Formosan termite colony travel?

According to the City of Jacksonville, Formosan colonies are very large and can forage up to 300 feet, which means a single colony can reach more than one structure.

Can Formosan termites live in trees?

Yes. Formosan termites can eat the centers of live trees and woody plants and can build nests above ground. Infested trees can keep supplying termites to a nearby home.

How does Paul’s Termite & Pest Control treat Formosan termites?

Paul’s Termite & Pest Control uses the Sentricon Colony Elimination System, which targets Eastern subterranean and Formosan termites with bait stations placed around the home. No tent fumigation is needed.

In Summary

Formosan termites are an invasive subterranean termite present in Jacksonville, with very large colonies that can forage up to 300 feet and nest above ground in walls and trees. Their swarms come out in the evening from May to July, and damage on upper floors, carton nests and activity in nearby trees are signs that point to this species. Early detection and colony-focused treatment are the best defense. Paul’s Termite & Pest Control protects Jacksonville-area homes from Formosan and Eastern subterranean termites with the Sentricon Colony Elimination System.

Need help now? Call Paul’s Termite & Pest Control at 904-567-8307 or request a free termite quote.

Key Takeaways

• Formosan termites are an invasive, highly destructive subterranean termite present in Jacksonville.
• Colonies are very large, can forage up to 300 feet and can nest above ground.
• Formosan swarms happen in the evening from May to July and are drawn to lights.
• Trees near the home can harbor Formosan colonies and should be checked.
• Paul’s Termite & Pest Control treats Formosan and Eastern subterranean termites with the Sentricon Colony Elimination System.
• Protect your home. Request a free termite quote or call 904-567-8307.