Michigan pest calendar

When each common pest is active in Michigan, and when it peaks. Timing shifts a week or two with the weather and runs later in the Upper Peninsula and northern Lower Peninsula than in the southern counties.

PeakActiveQuiet

Months each pest is active and at its peak in Michigan
Pest	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Rodents
Mice	Active	Active	Active	Active	Active	Active	Active	Active	Peak	Peak	Peak	Active
Rats	Active	Active	Active	Active	Active	Active	Active	Active	Peak	Peak	Peak	Peak
Indoor insects
Cockroaches	Active	Active	Active	Active	Active	Peak	Peak	Peak	Peak	Active	Active	Active
Ants	Quiet	Quiet	Quiet	Active	Peak	Peak	Peak	Active	Active	Quiet	Quiet	Quiet
Spiders	Quiet	Quiet	Quiet	Active	Active	Active	Active	Peak	Peak	Peak	Quiet	Quiet
Wood destroyers
Carpenter ants	Quiet	Quiet	Active	Peak	Peak	Peak	Active	Active	Active	Quiet	Quiet	Quiet
Termites	Quiet	Quiet	Active	Peak	Peak	Active	Active	Active	Active	Active	Quiet	Quiet
Fall invaders
Stink bugs	Quiet	Quiet	Active	Active	Active	Quiet	Quiet	Quiet	Peak	Peak	Active	Quiet
Asian lady beetles	Quiet	Quiet	Active	Active	Quiet	Quiet	Quiet	Quiet	Active	Peak	Active	Active
Cluster flies	Active	Active	Peak	Active	Quiet	Quiet	Quiet	Quiet	Peak	Peak	Active	Active
Stinging insects
Wasps and hornets	Quiet	Quiet	Quiet	Quiet	Active	Active	Active	Peak	Peak	Active	Quiet	Quiet
Biting pests
Bed bugs	Active	Active	Active	Active	Active	Peak	Peak	Peak	Peak	Active	Active	Active
Ticks	Quiet	Quiet	Active	Active	Peak	Peak	Peak	Active	Active	Active	Active	Quiet
Mosquitoes	Quiet	Quiet	Quiet	Quiet	Active	Peak	Peak	Peak	Active	Quiet	Quiet	Quiet
Wildlife
Wildlife	Active	Active	Peak	Peak	Peak	Peak	Active	Active	Active	Active	Active	Active
Bats	Quiet	Quiet	Quiet	Active	Active	Peak	Peak	Peak	Active	Active	Quiet	Quiet

Season by season

Winter December, January, February

Outdoor insects are dormant, so the calls are about what is already inside: mice and rats in walls and basements, cockroaches and bed bugs (which do not care about the weather), and the occasional cluster fly or lady beetle waking up on a warm sunny afternoon.

Rats

Spring March, April, May

Carpenter ants and pavement ants become active as the ground thaws. Eastern subterranean termites swarm in southern Michigan, usually on a warm day after rain. Overwintering stink bugs, lady beetles and cluster flies try to get back outside, often through your living space. Wasp queens start new nests.

Summer June, July, August

Mosquitoes and ticks peak, and so does time outdoors. Ant colonies are at full size. Wasp and hornet nests grow all summer and are at their largest and most defensive by August. Wildlife raise young in attics and under decks.

Fall September, October, November

The busiest stretch of the year for home invaders. Mice move indoors as nights cool. Asian lady beetles, stink bugs and cluster flies pile onto sunny walls looking for gaps. Yellowjackets get aggressive around food late in the season. Sealing up in September prevents much of it.

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