Why Louisiana Has No True Termite Off-Season
In northern states, termite season is easy to define: it starts when spring warmth triggers swarmers and ends when winter temperatures push colonies into dormancy. Louisiana doesn't work that way.
Average January lows across Louisiana range from 37°F in Shreveport to 46°F in New Orleans. That's consistently above the threshold needed to slow — but never stop — subterranean termite activity. Drywood termites inside a heated home don't register outdoor temperatures at all. They feed continuously, 24/7, regardless of the month.
The practical result: while termite swarming has a defined season in Louisiana (roughly February through October), termite damage is a year-round problem. Colonies feeding inside your walls don't take winter breaks.
Month-by-Month Termite Activity Calendar
| Month | Swarming Activity | Damage Risk | Action to Take |
|---|---|---|---|
| January | None | Moderate | Schedule annual inspection |
| February | Eastern subterranean — early | Moderate–High | Watch for daytime swarmers |
| March | Eastern subterranean — peak | High | Pre-season inspection |
| April | Formosan swarmers begin | Very High | Inspect immediately if swarmers seen |
| May | Peak month — all species | Very High | Highest-risk period statewide |
| June | Formosan late swarms | Very High | Treat if untreated |
| July | Slowing | Very High | Bait stations active |
| August | Drywood swarmers begin | Very High | Watch for drywood signs |
| September | Drywood — peak coastal areas | High | Coastal inspection priority |
| October | Drywood — winding down | Moderate–High | Post-season treatment window |
| November | Rare | Moderate | Evaluate bait station activity |
| December | None | Moderate | Winter inspection window |
What Swarming Actually Means — and Why It Matters
Termite swarmers (also called alates) are the winged reproductive members of a mature colony. Seeing them is alarming for a reason: a colony only produces swarmers after it has grown large enough and old enough to reproduce — typically 3 to 5 years old with tens of thousands to millions of workers.
By the time you see swarmers, the colony has already been feeding on your home (or a tree, stump, or neighboring structure) for years. The swarmers themselves don't damage wood — they're looking for a new nesting site. But their presence confirms a large, established colony is nearby.
A swarming event typically lasts 30 to 60 minutes, occurs at dusk for Formosan termites or mid-morning for eastern subterranean termites, and is triggered by specific environmental conditions: warm temperatures, high humidity, and often rain the day before. After swarming, the winged termites shed their wings. Finding a pile of discarded wings near a window, door frame, or light fixture is one of the most reliable early warning signs.
Swarming Schedule by Species
Formosan Subterranean Termites
Swarm season: Late April through June, peaking in May.
Swarm trigger: Warm evenings (above 70°F) after rain, typically between 8–10 PM.
Range: Entire state, but most severe in the southern parishes.
Colony size: Up to several million workers — the most destructive termite species in North America.
Formosan colonies can consume a pound of wood per day. In New Orleans and Metairie, Formosan pressure is so intense that treatment is essentially mandatory for any wood-frame structure.
Eastern Subterranean Termites
Swarm season: February through April, peaking in March.
Swarm trigger: Warm days (above 60°F), often mid-morning, frequently after rain.
Range: Statewide — the most geographically widespread termite species in Louisiana.
Colony size: Typically 60,000–2 million workers.
Because eastern subterranean termites swarm earlier in the year, homeowners in Shreveport, Baton Rouge, and northern Louisiana often see their first swarmers in late February — well before most people think "termite season" has started.
Drywood Termites
Swarm season: August through October.
Swarm trigger: Warm, humid afternoons; no rain required.
Range: Primarily coastal and southern Louisiana.
Colony size: 2,500–10,000 workers. They live inside the wood rather than tunneling from soil.
Drywood termites are harder to detect because they leave less visible evidence. They produce small pellet-shaped frass (droppings) — often the only sign before significant damage is done. Unlike subterranean species, they don't need soil contact, which means they can infest attic framing, furniture, and hardwood floors.
Warning Signs to Watch For Each Season
Spring (February–May): Highest Alert Period
- Winged termites emerging from walls, floors, or soil near your foundation
- Piles of discarded wings on windowsills, near light fixtures, or in doorways
- Mud tubes on foundation walls, piers, or interior walls — pencil-width tunnels of soil and termite saliva
- Soft spots in wood floors or hollow sound when tapping structural beams
Summer (June–August): Active Feeding Season
- Blistering or bubbling paint on wood surfaces (indicates moisture and termite tunneling beneath)
- Doors and windows that suddenly stick or won't close properly
- Frass pellets — tiny, oval, sand-colored droppings from drywood termites
- Visible damage inside walls during renovation or repair work
Fall (September–November): Late-Season Watch
- Drywood termite swarmers around coastal homes after humid afternoons
- New mud tubes that appeared over summer now drying and cracking
- Increased activity in bait stations if you have a monitoring system in place
Winter (December–January): Don't Let Your Guard Down
- Termites inside heated walls continue feeding — no outward signs, but damage accumulates
- Best time to schedule a professional inspection before spring swarming begins
- Check crawl spaces and pier foundations for mud tubes that formed during fall