Stink Bug Season in the Poconos: What Monroe County Homeowners Need to Know

Stink Bug Season in the Poconos

If you live in Monroe, Pike, Wayne, or Carbon County, you already know what happens every September. Stink bugs — the brown marmorated stink bug (*Halyomorpha halys*) — emerge from the surrounding forest in numbers that can seem almost apocalyptic, swarming window screens, crawling up siding, and slipping through any gap they can find to overwinter inside your walls and attic.

The Pocono Mountains sit squarely in one of the most heavily affected regions in Pennsylvania. Monroe County's dense hardwood forests, abundant tree-of-heaven stands, and proximity to the Delaware River agricultural corridor provide ideal stink bug habitat throughout the spring and summer — and every fall, those populations look for somewhere warm to survive the winter.

When Does Stink Bug Season Start in the Poconos?

The trigger isn't a calendar date — it's temperature. Stink bugs begin their fall migration when nighttime temperatures consistently drop below 70°F and daylight hours shorten. In the Pocono Mountains, that typically happens in mid to late September, though the exact timing shifts by two to three weeks between warm and cool years.

At elevation — and much of Monroe County sits between 1,400 and 2,200 feet — stink bug season often starts a week or two earlier than in the Lehigh Valley below. Properties surrounded by forest edge, particularly those with southern exposures that heat up during the day, tend to attract the highest concentrations.

Peak invasion is usually a 2–4 week window in late September through mid-October. After that, most of the overwintering population is inside or has settled into protected crevices in exterior walls.

How Do Stink Bugs Get In?

The short answer: any way they can. Common entry points in Pocono-area homes include:

• Window frames and screens — especially older single-pane windows or screens with small tears

• Door sweeps and threshold gaps — particularly on older exterior doors

• Siding penetrations — utility entries for water, gas, electric, cable, and HVAC

• Soffit and fascia gaps — where wood has pulled away from the structure

• Chimney flashing — a common entry point in Pocono homes with wood-burning stoves or fireplaces

• Log home chinking gaps — log cabins are particularly vulnerable as chinking ages and develops cracks

Once a stink bug finds a way in, it releases an aggregation pheromone that attracts others. This is why populations inside a single wall void can reach into the hundreds or thousands by December.

What Actually Works to Control Stink Bugs

#### Preventive exterior treatment (most effective)

The window for effective preventive treatment is early-to-mid September — before the migration begins. A professional perimeter and exterior application of a pyrethroid-based insecticide creates a barrier that kills stink bugs on contact as they attempt to enter. This treatment needs to cover:

- All window frames and sills

- Door frames and thresholds

- The entire foundation perimeter

- Siding penetrations and utility entries

- Soffit lines

One well-timed professional application before the invasion starts dramatically reduces the number of insects that make it inside. Waiting until you see stink bugs on your walls is waiting until the invasion is already underway.

#### Exclusion and sealing

Physical exclusion — caulking gaps, installing door sweeps, repairing window screens — provides lasting protection and should be done in late summer before stink bug season begins. In log homes, rechinking gaps and sealing around utility penetrations is particularly important.

#### Interior vacuum removal

Once stink bugs are inside your walls, the options are limited. Vacuuming is effective for removing visible insects, though doing so releases the characteristic odor. Using a dedicated shop vac or a vacuum with a bag (which traps the odor) helps. Many Pocono homeowners find that stink bugs emerge throughout the winter on warm sunny days, particularly around south-facing windows, until temperatures consistently rise in spring.

#### What doesn't work

Over-the-counter sprays applied inside do little to address the population living inside your wall voids. Bug zappers have minimal impact on stink bugs. Ultrasonic repellents have no demonstrated effectiveness.

Stink Bug FAQs for Pocono Homeowners

Do stink bugs damage my home?

No. Stink bugs are a nuisance pest — they don't bite, don't sting, don't carry disease, and don't cause structural damage. The odor released when crushed or disturbed is unpleasant but harmless.

Are stink bugs worse in certain parts of Monroe County?

Homes adjacent to forest edges and orchards — particularly in communities like Tannersville, Swiftwater, and the Pocono Lake area — tend to experience heavier invasions. South-facing homes at elevation also attract more insects due to the warm sun exposure.

When should I call a professional?

If you missed the preventive treatment window and are finding stink bugs throughout your home, or if you're seeing populations emerge from wall voids during winter warm spells, a professional evaluation can identify major entry points and apply residual treatments where accessible.

Will they all leave in spring?

Most of the population that successfully overwintered will exit when temperatures warm in late March and April, typically leaving the way they came in. Some will die inside the wall voids over winter.

---

L&L Pest Control offers seasonal stink bug preventive treatment throughout Monroe, Pike, Wayne, and Carbon counties. Treatment timing matters — the best results come from applications in early September before the migration begins. Call us at (570) 992-3487 to schedule or request a free estimate online.