Termite swarmers are winged reproductives that leave a mature colony in spring, usually after warm rain. University of Maryland Extension says a swarm points to a colony nearby, and indoors the swarmers die of dehydration. Finding wings or swarmers is the reason to book a termite inspection.
Key takeaways
- A termite swarm is a sign that a mature colony is nearby, not proof of damage on its own.
- In the state's sourced material, swarms appear in spring, roughly March to June, after warm rain.
- The eastern subterranean termite is the species reported for Maryland in an older state report.
- Indoors, swarmers die of dehydration, so the wings and bodies you find are the evidence to keep.
- A wood-destroying insect report is a written finding by a licensee, and lenders and contracts often ask for one.
- Call for an inspection when you see swarmers, wings on a sill or wood that sounds hollow.
What is a termite swarm, and why does it matter?
A termite swarm is a group of winged reproductive termites that leave a mature colony to start new ones. Seeing one indoors means a colony is close enough that some winged termites found their way out.
Swarmers are not the workers that damage wood. They are the reproductive insects of the colony, and they fly out in a short window to pair and found new colonies. University of Maryland Extension describes them as the sign of a mature colony nearby.
A swarm is a reason to inspect, not a verdict on the house. The inspection finds whether there is active damage and where the colony is feeding.
When do termite swarms appear in Maryland?
A 2004 state officials' report put swarms roughly from March to June, after warm rain. That report is older, so use the window as a guide and call when you see swarmers rather than waiting for a date.
The spring window is the sourced guidance. Local weather changes the timing from year to year, so a swarm can come earlier or later than the typical window.
Do not wait for the next season if you have seen swarmers once. The inspection can show whether the colony is active and what it has reached.
Which termite species is found in Maryland?
The eastern subterranean termite is the species reported for Maryland in a 2004 state officials' report. That report is older, and it is the only species this guide names.
The species matters because treatment is chosen for the termite that is present. A technician confirms the species during the inspection rather than relying on a general description.
The state report does not describe every species that might be found, so an inspection is the way to be sure what is in a particular house.
What signs should you look for besides swarmers?
Wings left on sills, window ledges and light fixtures show that a swarm has happened nearby. Wood that is soft, hollow or damaged near the ground also needs a look by a technician.
Swarm wings are often found in small piles on windowsills. Photograph them and keep a few, because they help the technician confirm what was seen.
Damage inside wood is hard to see from the surface. A technician checks wood at the ground, the sill plate and the crawl space rather than relying on what is visible from the room.
| Sign | What it usually means | What to do |
|---|---|---|
| Swarmers near windows or lights | A mature colony is nearby | Keep a sample and book an inspection |
| Discarded wings on a sill | A swarm has happened near the home | Photograph the wings and call |
| Soft or hollow wood near the ground | Possible damage that needs checking | Have a technician inspect the wood |
What is a wood-destroying insect report?
A wood-destroying insect report is a written finding by a licensee. In Maryland, licensees report inspection findings in writing on state Form MD-1. Lenders and contracts often ask for one.
The report records what the inspector found and where. It is the document a buyer, lender or contract may ask for, and it helps a homeowner keep a clear record of the house's condition.
Whether Maryland law requires one at a sale is not stated in the sources used for this guide, so ask your agent or lender what they need.
What should you do when you see swarmers?
Keep a few swarmers and the wings in a sealed container, note the date and location, and call for an inspection. Do not spray or use a household product to kill them, because treatment should follow the inspection.
A sample helps the technician confirm the insect. Photographs of the wings and the place they were found are also useful.
Ask for the inspection to cover the crawl space, the sills and any wood that touches the soil, since those are the places a colony can reach.
Frequently asked questions
Are termite swarmers the same as flying ants?
They can look like flying ants, so a technician confirms the insect from a sample. Keep one and call (855) 974-4733.
How long do swarmers live indoors?
They do not survive long indoors because they dehydrate. Finding dead swarmers and wings is the sign to look for, since it shows a swarm happened nearby.
Does a swarm mean my house is being eaten?
Not necessarily. A swarm shows a mature colony nearby. The inspection decides whether the colony has reached the structure and how far.
Will I need a report for a home sale?
Lenders and contracts often ask for a wood-destroying insect report. Whether Maryland law requires one at sale is not stated in the sources for this guide, so check with your agent.
Sources
This guide is general information for Montgomery County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.