Why Termites Swarm in San Jose Every Summer (And How to Prepare)
- Jameson Elam
- 5 hours ago
- 3 min read
About the Author: Jameson Elam is the owner and operator of Good Sense Termite, serving Alameda, Santa Clara, San Mateo, and Santa Cruz counties. With over 14 years of hands-on experience in the termite control industry, Jameson specializes in thorough inspections, accurate diagnostics, and long-term solutions tailored to California homes. His deep knowledge of local termite behavior and building structures has made Good Sense Termite a trusted name for homeowners and real estate professionals alike.
What Is a Termite Swarm?
A termite swarm is when winged reproductive termites, called alates, leave an established colony to create new ones. In San Jose, swarms often happen in late spring through the peak of summer, especially after a stretch of hot days followed by a warm, humid evening.
If you see clusters of small flying insects, piles of discarded wings, or bugs gathering near lights, you might be seeing a swarm. Swarms themselves do not damage your home, but they are a warning sign that an active colony is close by.
Why Termites Swarm in San Jose Each Summer
Termite swarms are tied to heat, humidity, and the unique microclimates of Santa Clara County:
Moist Soil from Late Rains or Irrigation Subterranean termites thrive in damp soil. In summer, heavy irrigation, late-season rain, or leaking outdoor fixtures can create perfect conditions for new colonies near your foundation.
Extended Warm Temperatures A long stretch of hot, calm weather tells termites it is time to swarm and find new nesting sites.
Microclimate Triggers in Santa Clara County
Coastal zones like Santa Clara and Sunnyvale may swarm earlier in the summer due to warmer nighttime lows.
Higher elevation areas like Los Gatos or Almaden Valley may see peak swarming later in the season when nights stay consistently warm.
Calm, Humid Conditions Termites use warm, still air with higher humidity to help them fly short distances without drying out.
Signs of a Termite Swarm Around Your Home
If you live in San Jose or nearby, look for:
Flying termites gathering windows around mid-day
Discarded wings on patios, windowsills, or in spider webs
Small pellet-like droppings (frass) from drywood termites
Spotting any of these means you should schedule an inspection quickly, even if you do not see visible damage.
How to Prepare for Summer Termite Swarm Season in San Jose
Schedule a Professional Termite Inspection A licensed inspector can find colonies in attics, crawl spaces, and behind walls before they grow.
Fix Moisture Problems Termites are drawn to water sources. Check sprinklers, drip lines, and hose bibs for leaks. Make sure soil slopes away from the foundation and crawl spaces stay dry.
Seal Entry Points Install mesh screens on attic vents, repair cracks in foundations, and seal gaps around doors and windows.
Manage Outdoor Lighting During Peak Swarm Hours Flying termites are attracted to light. Turn off unnecessary exterior lights during warm, humid evenings.
Have a Post-Swarm Action Plan If you see swarming, arrange a follow-up inspection quickly. Stopping a new colony early can prevent major repair bills.
FAQs About Termite Swarms in San Jose
How long do termite swarms last?
Usually just a few hours, but the colonies that released them remain active year-round.
Do swarming termites mean my home is infested?
Not always, but it usually means a colony is close and may already be inside. If you see 10 or more inside your home at a time, you likely have an infestation.
When should I call a termite company?
Immediately after you spot a swarm. Even if it stops quickly, early detection prevents costly structural damage.
Why Homeowners Trust Good Sense Termite
Good Sense Termite has over 14 years of experience protecting San Jose and Santa Clara County homes. We provide:
Free, detailed consultations tailored to each specific home inspected
Treatment plans specific to your home’s layout and the termite species involved
Customer-focused warranties for lasting peace of mind
Our inspectors know the seasonal swarm patterns for your exact neighborhood, so we can stop termites before they spread.
Protect Your Home Before Termites Swarm This Summer Summer swarms are your warning sign. Do not wait until you see damage. Schedule a free inspection with Good Sense Termite today and keep your home protected year-round.
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