When is cockroach season? They build up from late spring to early autumn, peaking in summer. Heat speeds up breeding and drives large cockroaches out of the sewers at night. German cockroaches in kitchens are present all year.
Cockroach season through the year
| Season | American cockroach (large) | German cockroach (small) |
|---|---|---|
| Spring | Starts emerging from sewers | Increases as it warms |
| Summer | Peak, flying at night around lights | Breeding peak |
| Autumn | Gradually declines | Continues |
| Winter | Stays in sewers and inspection chambers | Continues in warm kitchens |
Why do they increase in summer?
- Heat shortens the life cycle, so more generations appear in the same time.
- Sewers get hot and crowded, pushing roaches out to cooler, damp spots.
- Moisture from AC units and leaks gives them water.
- Food ferments faster and rubbish smells stronger.
Does rain bring them out?
Yes. Heavy rain floods sewers and inspection chambers, so cockroaches come to the surface and enter homes through drains and under doors. It is a short wave that arrives the same day or the next.
Signs the season has started
- A large cockroach in the bathroom or near the drain at night.
- Cockroaches flying around the yard light.
- Young cockroaches in kitchen cabinets.
- Black specks in hinges and corners.
How to prepare before summer
- Start in spring before the heat builds.
- Spray drains, inspection chambers and the perimeter with a residual insecticide.
- Apply cockroach gel in the kitchen and bathroom before numbers rise.
- Fit drain covers and seal around pipes.
- Fix leaks and dry AC drip trays.
- Repeat outdoor spraying every two to three months in season.
Products from Orkida
- Advion cockroach gel by Syngenta
- Maxforce Forte gel by Envu (formerly Bayer)
- Demand CS by Syngenta
- K-Othrine 25 EC by Envu (formerly Bayer)
- Catchmaster glue boards
- Economy German cockroach control kit
Cockroach season FAQs
Do cockroaches disappear in winter?
The large ones decline and stay in the sewers. German cockroaches remain in the kitchen.
Why do I see cockroaches flying in summer?
American cockroaches fly on hot nights and are drawn to light.
When is the best time to spray?
Late spring before the peak, with follow-up through summer.
Does extreme heat kill them?
No. They shelter in cool, damp places and come out at night.