Pest activity this month
Warming weather restarts insect breeding. Ant colonies expand, wasps and bees build new nests and mosquito numbers rise with early storms.
Pest activity shown here reflects general seasonal patterns for Australia, mainly the eastern states. It is not real-time outbreak data. Local weather can shift activity by weeks. We plan to add weather-informed notes when reliable data is integrated.
Commonly active in spring
What to expect
- Ant trails reappear in kitchens and bathrooms.
- New wasp nests start small under eaves and in shrubs.
- Mosquitoes increase quickly after the first warm storms.
Questions people ask this season
Weather-related pest behaviour
After heavy rain
Flooded drains, soil and mulch push cockroaches and ants indoors within hours to days. Mosquito numbers rise one to two weeks later.
Hot, humid nights
Large outdoor cockroaches become active and fly to lights. Fleas and ants develop faster.
Hot, dry spells
Ants search for water around sinks, bathrooms and pet bowls.
Cold nights
Rats and mice move into roofs, walls and sheds seeking warmth and food.
Read more: Understanding pest activity after rain
Seasonal pests at a glance
| Pest | Summer | Autumn | Winter | Spring |
|---|---|---|---|---|
| Cockroaches | High | Moderate | Low | Moderate |
| Ants | High | Moderate | Low | High |
| Spiders | Moderate | High | Low | Moderate |
| Rats | Moderate | High | High | Moderate |
| Mice | Low | High | High | Moderate |
| Mosquitoes | High | Moderate | Low / none | Moderate |
| Fleas | High | Moderate | Low | Moderate |
| Bed bugs | Moderate | Moderate | Moderate | Moderate |
| Wasps | High | Moderate | Low / none | Moderate |
| Silverfish | Moderate | Moderate | Low | Moderate |
| Flies | High | Moderate | Low | Moderate |
| Pantry Pests | High | Moderate | Low | Moderate |
| Lawn Pests | High | High | Low / none | Low |
Summer pest activity
Heat and humidity speed up insect development. Cockroaches, ants, mosquitoes, flies and fleas are at or near their peak, especially in subtropical and tropical Australia.
Autumn pest activity
Many spiders are most noticeable as they mature and mate. Rodents begin looking for sheltered nesting sites as nights cool.
Winter pest activity
Most insect activity slows, but rodents seek warmth and food inside buildings. Indoor pests such as German cockroaches keep breeding in heated kitchens.
Spring pest activity
Warming weather restarts insect breeding. Ant colonies expand, wasps and bees build new nests and mosquito numbers rise with early storms.
Local detail: Brisbane pest calendar · Summer pests in Brisbane · Winter pests in Brisbane