A narrow line of dried mud on a foundation may not look serious. Neither does a small pile of gritty pellets under a window. In a California home, though, those two clues can point to completely different termite problems.
Knowing which termite in California you’re dealing with matters because subterranean and drywood termites live differently, enter homes differently, and leave different evidence behind. Their swarm periods also vary. One colony may be below the soil, while another can stay hidden inside dry lumber without any connection to the ground. The sooner you understand what you’re seeing, the easier it is to decide whether the property needs a termite inspection.
Key Takeaways
- California has at least 23 termite species, but subterranean, drywood, and dampwood termites are the groups homeowners are most likely to hear about when structural wood is involved.
- Subterranean termites commonly leave mud tubes, while drywood termites are more likely to leave hard pellets, kick-out holes, and discarded wings.
- Termite swarm season in California varies by species, weather, and region, so fresh wings or other evidence around the home matters more than one fixed month on the calendar.
What Types of Termite in California Should Homeowners Know About?
California supports several kinds of termites. The UC Statewide Integrated Pest Management Program reports at least 23 termite species in California, although only some regularly damage buildings.
For homeowners, three groups deserve the most attention: subterranean termites, drywood termites, and dampwood termites. They all feed on cellulose, but their habitat and access to a structure are quite different.
| Termite Group | Typical Habitat | Common Evidence |
| Subterranean termites | Soil and wood reached from the soil | Mud or shelter tubes |
| Drywood termites | Dry structural wood above ground | Hard pellets, kick-out holes, discarded wings |
| Dampwood termites | Moist or decaying wood | Water-damaged or weakened wood |
Subterranean Termites
Subterranean termites maintain colonies in the ground and travel outward to find wood. When they need to cross concrete, masonry, piers, or exposed foundation walls, they often build narrow shelter tubes from soil and other material.
Those tubes protect the termites while they move between the colony and their food source. Areas around crawl spaces, foundation walls, posts, and wood that sits close to the soil are common inspection points.
Drywood Termites
Drywood termites don’t need contact with soil. They can establish colonies inside framing, eaves, window trim, furniture, and other dry wood above ground.
The UC IPM drywood termite guide notes that a single drywood termite colony generally contains fewer than 1,000 termites. More than one colony can exist in the same structure, so a small pile of debris doesn’t necessarily mean the affected area is limited.
Drywood termites also leave a distinctive form of evidence. They push hard pellets, often called termite frass, through tiny openings in the wood. These pellets may collect on floors, windowsills, furniture, or below exposed trim.
Dampwood Termites
Dampwood termites favor wood that remains unusually wet. Roof leaks, plumbing problems, poor drainage, decaying exterior lumber, or wood that stays in contact with wet soil can create the conditions they prefer.
Their presence often points to a moisture problem as well as a pest problem. If wet wood remains untreated, the same conditions that supported the infestation are still present.
Subterranean vs. Drywood Termites in California
The easiest way to separate the two major termite groups is to look at where the colony lives and how the termites reach the wood.
Subterranean termites come from the soil. Their activity often shows up around foundations, crawl spaces, support posts, or places where structural wood sits close to ground level. Mud tubes are one of the strongest signs associated with them.
Drywood termites live inside the wood itself. They may infest eaves, trim, window frames, roof timbers, or furniture without leaving any trail back to the ground.
| Feature | Subterranean Termites | Drywood Termites |
| Colony location | Mainly in soil | Inside dry wood |
| Soil contact | Required | Not required |
| Common visible sign | Mud tubes | Pellets and kick-out holes |
| Common inspection areas | Foundation, crawl space, wood near soil | Eaves, windows, trim, framing |
| Typical swarm conditions | Often tied to favorable moisture and rain | Often during warm summer and fall weather |
That difference matters when treatment is considered. A soil-based colony calls for a different approach than termites living inside isolated sections of structural wood, so identifying the termite group should come before choosing a termite control method.
When Is Termite Season in California?
There’s no single termite season in California that applies to every species or region. Swarming depends on temperature, rainfall, moisture, and the kind of termite involved.
Subterranean termites often produce swarms when moisture and temperature conditions are favorable, including periods after significant rain. Depending on the area and species, this activity can occur during spring or fall.
Western drywood termites more often swarm during warmer summer and fall weather. Their flights frequently happen during daylight, while some termites in hotter inland or desert areas may be active during warm evenings.
What a Termite Swarm Looks Like
A termite swarm happens when reproductive termites leave an established colony to pair up and start new colonies. These termites have wings during the flight, then shed them after landing.
You may never see the actual swarm. Instead, you might find a cluster of loose wings on a windowsill, around a sliding door, near a light fixture, or along a baseboard later in the day.
A swarm outdoors doesn’t prove that your home has a termite infestation. The insects could have come from a stump, fence post, tree, buried lumber, or another structure. Discarded wings or swarmers found indoors deserve more attention because the source may be inside the building or very close to it.
What Are the Main Signs of Termites in a California Home?
Termites spend most of their time out of sight. In many cases, the first warning comes from what they leave behind rather than from seeing workers feeding on exposed wood.
The type and location of that evidence can also give you useful clues about which termite group may be active.
| Warning Sign | What It May Indicate |
| Mud tubes | Subterranean termites moving between soil and wood |
| Dry pellets or termite frass | Drywood termite activity in nearby wood |
| Kick-out holes | Openings used by drywood termites to expel pellets |
| Discarded wings | A recent swarm nearby |
| Hollow-sounding wood | Internal wood loss that needs investigation |
| Splintering or damaged wood | Possible feeding or another wood-damaging condition |
Mud Tubes
Mud tubes are closely associated with subterranean termites. You may find them running up a foundation wall, across concrete, around crawl-space supports, or occasionally inside the structure.
An old or dry-looking tube is still worth noting. Termites can maintain several travel routes at once, so one unused tube doesn’t tell you whether activity has stopped elsewhere.
Hollow or Damaged Wood
Termites can remove material from inside a board while leaving much of the visible surface intact. A beam, baseboard, floor section, or piece of trim may start to sound hollow when tapped or feel thinner than expected.
Hollow wood alone doesn’t confirm termites. Moisture damage, decay, and other wood-destroying pests can create similar symptoms, which is one reason an inspection matters.
Discarded Wings
Loose wings are easy to sweep up and forget, but their location can be useful. A group of similarly sized wings around a window or door can show that reproductive termites recently landed or emerged nearby.
If you also find mud tubes, pellets, or damaged wood, keep a few wings or insects and note exactly where you found them. That information may help with identification during the inspection.
Pellets and Kick-Out Holes
Drywood termite pellets are hard and dry rather than powdery. They can look like coarse sand or tiny grains of sawdust until you look more closely.
The termites push them through small kick-out holes in the wood. If you clean up a pellet pile and fresh material appears again in the same place, the nearby trim, framing, or wood above it deserves closer attention.
Why Early Termite Inspection Matters
Termite damage can develop in places you rarely see. Wall voids, framing, subfloors, crawl spaces, and enclosed roof areas may hide feeding while the exposed surface still looks normal.
That’s why early termite inspection matters more than waiting for dramatic damage. A professional can determine whether the evidence actually comes from termites, identify the termite group involved, locate visible areas of activity, and check for conditions such as excess moisture or wood-to-soil contact.
Early Inspection Can Limit the Scope of Damage
The longer termites have access to structural wood, the more material they have time to consume. Discovering activity while the evidence is still limited can reduce the chance that a small problem develops into more extensive termite damage and repair work.
California regulates structural pest professionals, and the California Structural Pest Control Board provides information for consumers about licensed operators and termite inspections. That gives homeowners a state resource when deciding who should evaluate suspicious wood damage or termite activity.
Inspection Helps Determine the Right Next Step
Mud tubes, pellets, or discarded wings tell you that something deserves attention, but they don’t reveal the full extent of an infestation by themselves. An inspection can help determine whether the activity is current, which areas are affected, and whether the evidence points to subterranean or drywood termites.
Those details matter because the treatment approach depends on where the colony is located and how termites are reaching the structure.
Protecting Your California Home From Termites
Subterranean termites and drywood termites can both damage California homes, but they do it in different ways. One group reaches wood from the soil and often leaves mud tubes behind. The other can remain hidden inside dry lumber, where pellets, kick-out holes, or discarded wings may be the first clue.
Finding those signs early gives you more useful information before hidden termite damage becomes easier to see. An inspection can identify the termite group, locate visible activity, and uncover conditions that may be helping termites enter or remain in the structure.
If you have found mud tubes, recurring pellets, discarded wings, hollow wood, or suspicious wood damage, Official Pest Prevention can inspect the property and recommend the next step based on what is present. For homeowners throughout Sacramento, Fresno, Northern California, and the Central Valley, early identification can help keep a termite problem from turning into a larger repair project.
Termite in California: FAQs
What time of year are termites most active in California?
There’s no single statewide termite season. Subterranean termite swarms are often tied to favorable moisture and rain, while western drywood termites more commonly swarm during warm summer and fall weather. Your region, recent weather, and the termite species all affect when swarm activity appears.
How can I tell whether I have drywood or subterranean termites?
Mud tubes are strongly associated with subterranean termites because these colonies travel between soil and wood. Drywood termites are more likely to leave hard pellets, kick-out holes, or discarded wings. Because several wood problems can look similar, a professional inspection is the most reliable way to identify the source.
Should I be concerned if I find termite wings inside my house?
Yes, indoor wings are worth investigating, especially when they appear near windows, doors, or baseboards. Discarded wings can mean a termite swarm occurred inside the structure or very close to it. If you also notice pellets, mud tubes, or damaged wood, schedule an inspection rather than relying on the wings alone.
