Peak Drywood Termite Season: What to Watch For in July and August
If you've been following our blog this year, you already know that drywood termite swarming season begins in late June in the Bay Area. Now that we're into July, we've entered the peak window — and it's the most important time of year to know what to watch for and what to do if you see it.
Here's your up-to-date guide to what's happening with drywood termites right now, and what Bay Area homeowners should be paying attention to through the end of summer.
Why July and August Are the Highest-Risk Months
Drywood termite swarms are triggered by a combination of warm temperatures, low humidity, and extended daylight hours — conditions that the Bay Area delivers reliably from July through September. July and August sit at the peak of these conditions, making them the months when:
Established colonies are most likely to produce and release swarmers
Swarmers are most actively seeking new wood to infest
New colonies are most likely to be established in and around your home
This doesn't mean termites are only a summer problem — both drywood and subterranean termites can be active year-round in our climate. But July and August are when drywood termite visibility is at its highest, which makes it the easiest time to catch early warning signs before a new infestation takes hold.
What a Drywood Termite Swarm Looks Like
Many Bay Area homeowners see a drywood termite swarm without realizing what they're witnessing — or they spot the aftermath and aren't sure what caused it.
Here's what to look for:
During a swarm: A sudden emergence of small, winged insects — often dozens to hundreds — from a specific area of your home. Swarms are typically brief, lasting 30 minutes or less. They're strongly attracted to light, so you may see them clustering around windows, skylights, or light fixtures, particularly in the late afternoon and evening.
After a swarm: Small piles of discarded wings near windows, doors, skylights, or light fixtures. Swarmers shed their wings immediately after mating, leaving behind what looks like tiny translucent scales. Finding wing piles without seeing the swarm itself is very common — and just as significant.
Frass accumulation: During peak season, drywood termites are more actively expanding their galleries, which means more frass being pushed out of kick-out holes. Check windowsills, baseboards, and areas beneath attic access points for small pellet accumulations that look like coarse sand or pepper.
Where to Look on Your Property
During July and August, focus your attention on the areas most commonly targeted by swarming drywood termites:
Attic vents and eaves.
The upper portions of your home are the primary target for drywood swarmers, who typically enter from above. Damaged or missing attic vent screens are the single most common entry point during peak swarming season.
Window and door frames.
Any gap in the paint or sealant around exterior frames is an opportunity for a swarmer to enter and start a colony. This is especially common on the south and west-facing sides of a home that receive the most direct sun exposure and heat.
Roof intersections and exposed rafters.
Areas where roof sections meet, or anywhere unfinished wood is exposed at the roofline, are attractive landing spots for swarmers.
Wooden fences, gates, and outbuildings.
Garages, sheds, pergolas, and fencing are frequently infested during swarming season — and infestations in outbuildings can spread to the main structure over time.
The Difference Between a New Swarm and an Established Infestation
This is an important distinction that affects your treatment options and urgency.
A new swarm means swarmers have landed on your home and are attempting to establish a colony. At this very early stage, the colony hasn't yet done any meaningful damage — catching it now and treating promptly is the best-case scenario.
An established infestation means a colony has been living in your home's wood for years, and is now mature enough to produce swarmers. If swarmers are emerging from inside your walls, attic framing, or floor structures, the infestation is already well established — and treatment is more urgent.
A professional inspection will determine which situation you're in, and what treatment approach is appropriate.
What to Do If You See Swarmers This Summer
Step 1: Don't panic, but don't ignore it. Swarmers are a signal — either that termites are trying to get in, or that they've already been living there for years. Both situations warrant attention.
Step 2: Take a photo. This helps confirm the species. Drywood termite swarmers have straight antennae, equal-length wings, and no pinched waist. Flying ants — a common look-alike — have elbowed antennae, wings of unequal length, and a distinctly pinched waist.
Step 3: Note where you saw them. Inside or outside? Which area of the home? Near a specific wall, vent, or window? This information helps a termite inspector narrow down where to look.
Step 4: Call for an inspection promptly. July and August are our busiest months. The sooner you call, the sooner we can get eyes on your home before any new colony has time to establish.
Preventative Steps You Can Still Take Right Now
Even if you haven't seen any activity yet, these steps reduce your home's vulnerability through the rest of peak season:
Repair any damaged attic vent screens — this is the single highest-impact step you can take right now
Caulk and seal gaps around window and door frames, particularly on sun-exposed sides of the home
Paint or seal any exposed, unfinished exterior wood — bare wood is significantly more vulnerable to swarmer entry
Schedule a professional inspection if you haven't had one this year
The Bottom Line
July and August are the months drywood termites have been building toward all year. Peak swarming season means peak vulnerability for Bay Area homes — and peak opportunity to catch new activity early, before a colony becomes established and treatment becomes more involved.
If you've seen swarmers, wing piles, or frass anywhere on your property this summer — or you just want to go into peak season knowing where your home stands — give us a call.
Call or text Good Sense Termite at (408) 418-9152 or request your free inspection online. Free, thorough, and honest.
It's just good sense.
Frequently Asked Questions: Peak Drywood Termite Season
When exactly is peak drywood termite swarming season in the Bay Area?
Peak drywood termite swarming season in the Bay Area runs from July through September, with July and August being the highest-activity months. Swarms are triggered by warm temperatures, low humidity, and long daylight hours — conditions the Bay Area delivers consistently during this period.
How do I know if the winged insects I saw are drywood termites or flying ants?
The key differences: drywood termite swarmers have straight antennae, two pairs of equal-length wings, and a straight body with no pinched waist. Flying ants have elbowed (bent) antennae, wings of unequal length, and a distinctly pinched waist. If you're not sure, take a photo and contact a termite professional for identification.
If I see termite swarmers outside my home, does that mean I have an infestation? Not necessarily. Swarmers outside your home may be coming from a neighboring property, a nearby tree, or a wood structure in your yard rather than from inside your home. However, it does mean termites are actively swarming in your area, which increases the risk of a new infestation establishing. An inspection will determine whether any activity is present in your home's structure.
How quickly can a drywood termite colony establish after swarming?
After a pair of swarmers mates and finds a suitable piece of wood, they can begin establishing a colony within days. However, drywood termite colonies grow slowly — a newly established colony is small and causes minimal damage in its first year. This is why catching swarmer activity early and scheduling an inspection promptly gives you the best treatment options.
Do drywood termites swarm more than once a year?
A single colony typically produces one primary swarm per year during peak season. However, if multiple colonies are present in or near a structure — which is common in older Bay Area homes — you may observe multiple swarming events from different colonies during the July through September window.
Is it safe to stay in my home during drywood termite swarming season?
Yes, absolutely. Drywood termite swarmers don't bite, sting, or pose any direct health risk to people or pets. The concern is entirely structural — what the colony they come from is doing to your home's wood. Regular inspections and prompt attention to swarming activity are the appropriate response, not evacuation or alarm.
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