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Southern California Termite Risk Map 2026
See drywood and subterranean termite risk levels across 85+ Southern California cities. Risk scores are built from Ultimate Termite Control's own field data — 260,000+ inspections since 2007 — not modeled estimates. Click any city for a full risk breakdown.
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Why Southern California Has Year-Round Termite Risk
Southern California's Mediterranean climate — warm, dry summers and mild winters — creates near-ideal conditions for termites year-round. Unlike cold-climate states where winter kills termite activity, SoCal colonies remain active 10–12 months a year.
The coastal marine layer adds moisture that drywood termites rely on for colony survival. Cities within 5 miles of the coast — Newport Beach, Laguna Beach, Huntington Beach, Long Beach — consistently show the highest infestation rates in our inspection data.
Species by Region
Understanding the Risk Levels
Consistently the highest infestation rates in our inspection data. Homeowners in critical-risk cities should have an annual professional inspection and consider preventive treatment for any wood structure.
→ Annual inspection + preventive treatment recommended
Significant termite pressure with active swarm seasons. Most homes over 15 years old in high-risk cities have had at least one termite infestation. Inspections every 1–2 years are advisable.
→ Inspection every 1–2 years recommended
Termites are present and active seasonally. Newer construction and low-humidity inland areas see lower infestation rates but are not immune. Watch for swarmers in spring.
→ Inspection when buying or after seeing swarmers
Lowest relative risk in Southern California. Newer master-planned communities with treated lumber and lower humidity. Termites can still occur — especially subterranean species near irrigation.
→ Inspection when buying a home; watch for signs
When Termites Swarm in Southern California
| Month | Activity | Where |
|---|---|---|
| January–February | Subterranean swarmers rare; inspection season begins | Inland Empire, Riverside |
| March | Early subterranean swarms begin after first warm rains | All regions |
| April | Peak drywood + subterranean swarming begins | All of Southern California |
| May | Highest swarming activity of the year | All of Southern California |
| June | Coastal cities continue heavy swarming | OC coast, Long Beach, LA coast |
| July–August | Coastal cities still active; inland activity slows | Newport Beach, Laguna Beach, Dana Point |
| September–November | Fall swarming in some drywood colonies | All regions — less common |
| December | Minimal activity; pre-purchase inspection season | All regions |
Seeing swarmers right now?
Swarmers (winged termites) are reproductive termites leaving an established colony. Their presence inside your home means a mature colony is already active. Don't wait — colonies grow exponentially.
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Free AI WDO Photo Check
Upload a photo of suspected termite damage or signs for an instant AI assessment.
Try it free →Drywood Termite Control
Signs, treatment options, and when fumigation is necessary for drywood termites.
Learn more →Subterranean Termite Control
Mud tubes, Termidor treatment, and why fumigation doesn't work on subterranean colonies.
Learn more →Frequently Asked Questions
Which Southern California cities have the highest termite risk?
Coastal cities have the highest termite risk. Newport Beach, Huntington Beach, Laguna Beach, Costa Mesa, Dana Point, San Clemente, Long Beach, and Santa Ana are rated Critical Risk due to coastal humidity, older housing stock, and proximity to marine environments.
When do termites swarm in Southern California?
Most Southern California cities see peak termite swarming from April through June. Coastal cities like Laguna Beach can see swarmers as early as March and as late as August. Inland Empire cities often see earlier swarms starting in March.
Why do coastal cities have higher termite risk?
Coastal cities have higher humidity year-round, which creates ideal conditions for both drywood and subterranean termites. The marine layer provides moisture that termites need, and older housing stock near the coast has had more time to develop infestations.
Do inland cities have lower termite risk?
Inland cities generally have lower drywood termite risk due to lower humidity, but subterranean termite risk can be high — especially in areas with agricultural history (like Chino and Ontario) or heavy irrigation. The Inland Empire has significant subterranean termite pressure.
How was this map built? What data is it based on?
The risk levels on this map come from Ultimate Termite Control's own inspection records. Since 2007, our California-licensed inspectors have documented termite findings — species present, infestation frequency, swarmer activity, and structural damage patterns — across 260,000+ inspections in Southern California. We aggregate the data by city to produce relative risk scores for drywood and subterranean termites. The map reflects what we've actually found in the field, not modeled estimates or projections.
What's the difference between drywood and subterranean risk shown on the map?
The map shows two separate risk dimensions because these are different termite species that behave differently. Drywood termites live entirely inside dry wood — they don't need contact with soil and they're concentrated in coastal areas where humidity supports their colonies. Subterranean termites live in soil and travel into structures via mud tubes — they thrive in areas with older homes, irrigation, and soil moisture, which is why inland cities with mature landscaping often show high subterranean risk even when drywood pressure is moderate. A city can be high-risk for one species and low-risk for the other.
My city is Critical Risk — what should I do next?
A "Critical Risk" rating means our inspection data shows consistently high infestation activity in your city — not that your specific home has termites, but that the regional pressure is significant. Recommended next steps: schedule a free inspection so we can confirm whether your specific property has active termites, get on an annual inspection schedule if you're not already (we recommend annual for Critical Risk cities, every 2 years for High Risk, every 3 years for Medium Risk), and consider preventive Bora-Care treatment on any accessible wood during construction or remodeling work — it's the cheapest time to add long-term protection. Most homes in Critical Risk cities don't need immediate treatment — they need monitoring so issues are caught before they cause structural damage.
Does my zip code matter, or just my city?
The map shows city-level risk because that's what our data is statistically meaningful at — we have enough inspection records per city to produce a reliable score. Within a city, risk can vary by neighborhood based on housing age, proximity to coast, irrigation patterns, and adjacent vegetation. A 1920s bungalow in coastal Newport Beach faces different pressure than a 2010 build a mile inland, even though both share the same Newport Beach city designation. If you want a property-specific assessment rather than a regional one, schedule a free inspection — that's what your inspector will give you based on the actual structure.
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