Home / Termite Risk Map
Southern California Termite Risk Map 2026
See drywood and subterranean termite risk levels across 85+ Southern California cities — based on 19 years of real inspection data. Click any city for a full risk breakdown.
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.
Learn More
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.
Is Your City High Risk? Get a Free Inspection.
Same-week appointments across Orange County, LA County, Inland Empire, and Riverside County. No charge, no obligation.