In Lafayette Parish the termite swarm season runs from late April into June, according to LSU AgCenter, with the peak in May and June and a large peak around Mother's Day. A swarm points to a nearby infestation, so the AgCenter advises inspecting the home and the trees. This guide walks through the calendar month by month and explains what to do when a swarm is seen.
Key takeaways
- The LSU AgCenter gives the swarm season for Lafayette Parish as late April into June.
- The peak falls in May and June, with a large peak around Mother's Day.
- A swarm points to a nearby infestation, so the home and the trees should be inspected.
- Swarmers are often mistaken for flying ants, so collect a sample before deciding.
- Turning off unneeded outdoor lights at night in May and June reduces the swarmers drawn to the house.
What does the swarm calendar look like, month by month?
The window opens in late April, climbs to its peak in May and June and tapers off by the end of June. Outside that window swarms are unusual, and a swarm in another season should be described in detail to whoever inspects it.
The calendar in the table below is the one LSU AgCenter describes for Lafayette Parish. It is a regional guide, not a forecast for any one property, and the weather in a given year can move the start and the end of the window by a week or two. The useful way to read it is as the period in which a swarm is most likely, and the period in which a homeowner should be watching the lights and the wings most closely.
The Mother's Day peak is the one most people remember. AgCenter describes a large peak around that date, which falls in the middle of the May and June window. A homeowner who sees wings for the first time in that week should treat the sighting as a priority, not a curiosity.
| Period | What the AgCenter describes | What a homeowner should do |
|---|---|---|
| Early April | Before the window opens. Swarms are not expected yet. | Check the house and the yard for mud tubes and stumps while the weather is mild. |
| Late April | The window opens. Early swarms are possible. | Turn off unneeded outdoor lights at night and book a spring inspection if one is due. |
| May | The peak, with a large peak around Mother's Day. | Watch the porch and garage lights each evening and keep any wings for the inspector. |
| June | The second half of the peak. | Keep the monitoring going and report any new swarm with the date and place. |
| Late June onward | The window closes. Swarms are rare. | Review the year's notes and set the next check before the following spring. |
What is a swarm, and why does it matter?
A swarm is a colony releasing winged reproductives to start new colonies, and the AgCenter treats it as a sign that a nearby infestation exists. The swarm does not describe the whole colony, but it does tell the owner that a colony is close enough to matter.
Termite swarmers are the reproductive members of a colony. They fly to find a mate and a place to start a new colony, and they shed their wings after landing. Their wings are the most useful evidence a homeowner can keep, because the inspector can compare them against the insect and the place where they were found.
The AgCenter advice is direct. A swarm points to an infestation nearby, and the home and the trees should be inspected. The point is not to find the swarm's origin from the swarm alone, but to follow the trail from the light, the step and the sill to the most likely source, which is often the foundation, a stump or the base of a tree.
How do I tell a termite swarmer from a flying ant?
The waist, the antennae and the wings give the difference. Termite swarmers have a broad, straight waist, short straight antennae and two pairs of wings of nearly equal length that break off cleanly after flight.
Flying ants have a pinched waist and bent antennae, and their front wings are noticeably longer than the back pair. They are often seen in the same spring weeks, which is why the mix-up is so common. A sample taken in a sealed container and shown to the inspector is worth more than a description on the phone.
Do not spray the swarm or sweep the wings away before the sample is taken. The wings are the evidence that tells the inspector where the swarm came from, and a swarm that is killed or swept away leaves nothing to examine.
What should a homeowner do when a swarm is seen?
Collect a few wings and insects in a sealed container, note the date and the place, switch off the light that is drawing the swarmers if that is safe, and book an inspection that covers the house and the trees.
Photograph the place where the swarm or the wings were found, from close up and from further back so the spot can be placed on the house. Keep the photographs with the date and time in the same note as the sample.
Close the door nearest the swarm and check the screens for gaps. If the swarm is still happening when the call is made, say so at the start. The line is answered 24/7, so a swarm at night can be reported when it happens, and the inspection is booked for the day.
How long does the season last, and what happens after it?
The window closes by the end of June in most years, but the colony does not stop working when the swarms stop. Monitoring and inspection should continue through the year, with a check set before the next spring.
A colony that released swarmers in May has been feeding for some time. Its activity in the soil and the wood continues after the swarm season ends, and a homeowner who stops watching in July may miss the colony's next move. The plan should set a date in the autumn or winter for a review, not just a date in the spring.
The swarm calendar is a reason to look more closely in May and June, not a reason to relax for the rest of the year. A house with a known colony or a recent swarm should be checked on a schedule that runs through every season.
How should a spring inspection be timed around the calendar?
Book the spring check before the window opens or early in it, so the inspector has time to act on the findings before the peak. Booking in the middle of the peak can leave the owner waiting while the swarms are at their height.
A check made in early April gives the owner a baseline before swarms are expected. The inspector can record the state of the foundation, the trees and the stored material while the weather is mild and the wood is easy to reach. The record then becomes the comparison for any swarm that follows.
A check made in the second half of May is still useful, but it is more likely to find the swarm itself and its trail. Both kinds of visit have value. The point of a spring plan is to have a dated record before the peak and a response ready for the peak, and it should not depend on a single visit.
What do owners most often get wrong in swarm season?
The most common mistakes are waiting too long before calling, sweeping away the wings, leaving the porch light on all night and assuming a single swarm is a one-off. Each one loses evidence or time.
Waiting is the most costly. A swarm that is seen on Monday and reported the following Friday has lost several days of evidence, and the wings may have been swept or blown away. The AgCenter's advice to inspect after a swarm is easiest to follow when the call is made the same day.
Sweeping the wings is the second. A homeowner who clears the step before anyone has looked at it removes the most useful evidence the inspector has. Collect a sample in a sealed container and leave the rest for the inspection.
A single swarm is also not a reason to relax. The AgCenter links a swarm to a nearby infestation, so one swarm is enough reason to look, even if no further wings appear after that evening.
How does the calendar apply to rentals and multi-unit buildings?
In a rental the swarm can appear on one unit and reach others through the same wall, drain or attic. The owner and the tenant both need the calendar, and the report should say which unit it was seen in and who is responsible for the next step.
A swarm at a rental is often reported by a tenant first, sometimes at night and sometimes with wings collected in a bag. The owner needs the date, the unit and the place on the report, and the tenant needs to know what to keep and what to leave alone until the inspection.
The rental service sets out how the split of work is written into the plan. The calendar is the same, but the record has to say whose responsibility each step is, so that a swarm in May does not wait for a dispute in June.
What does the rest of the year look like after the window closes?
After the window closes, the work moves from watching the lights to reviewing the record, repairing the moisture and gaps the inspection found and setting the next check. The owner should not stop looking at the house until the next season has been planned.
In July, August and the autumn, the most useful work is repair. A leaking spigot, a downspout that discharges at the foundation or a gap at a pipe is easiest to fix when the weather is dry, and it removes a condition the colony uses.
In the winter, the record can be read at leisure. A homeowner who compares the spring notes with the findings can see which places kept showing activity, and which were quiet. That comparison decides where the next spring check should look first.
Why the window is a regional guide and not a forecast
The AgCenter's dates describe the usual pattern for Lafayette Parish, and they are a regional reference. The weather of a given spring can shift the start and the peak, so the window is a planning tool and not a promise for any single property.
A warm, wet spring may bring swarms earlier, and a cool one may hold them back. The calendar is therefore best used to decide when to watch and when to book, and not to decide whether a swarm can happen in a given week. A swarm in an unexpected week still deserves a call and a record.
The calendar also works in reverse. A quiet May does not mean the colony has gone, and the monitoring should continue through the summer and autumn even if no swarm has been seen.
Frequently asked questions
Can termites swarm in March?
The AgCenter gives the swarm window for Lafayette Parish as late April into June. A swarm outside that window is unusual, so describe it in detail to the inspector and keep any wings.
Is a single swarm a sign of a serious problem?
It is a sign that a colony is nearby, which is enough reason to inspect the house and the trees. It does not by itself say how large the problem is, and only an inspection can do that.
Should I turn off my porch light during swarm season?
The AgCenter advises turning off outdoor lights at night in May and June, because swarmers are drawn to light. Keep the path lit for safety with a timer or a motion light if that is needed.
What if I see swarmers inside the house?
Close the door to that room, collect a sample safely and book an inspection the same day. Do not spray the room or open windows wide without checking the weather and the safety of the people inside.
Sources
- LSU AgCenter, termite swarm and prevention pages for Lafayette Parish
- U.S. Census Bureau, QuickFacts, Lafayette Parish and the city of Lafayette
This guide is general information for Lafayette Parish homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.