Minor Activity vs. Serious Infestation — Reading the Signs
✓ Likely Minor — Foraging Activity
Small trail of ants leading from a window, door gap, or baseboard crack to a food source. Activity peaks in spring and after rain. Disappears when food source is removed. One species, one entry point.
⚠ Likely Serious — Established Indoor Colony
Ants present year-round or in winter. Ants in multiple rooms with no clear outdoor trail. Large black ants (carpenter ants) emerging from walls or ceilings. Winged ants appearing indoors in spring.
✓ Likely Minor — Seasonal Odorous House Ants
Small dark ants in kitchen following a visible trail after rain or in early spring. Smell like blue cheese when crushed. Respond well to borax gel bait placed directly on the trail.
⚠ Likely Serious — Carpenter Ant Satellite Colony
Large black ants active at night, found in kitchen or bathroom year-round. Coarse sawdust-like frass found near baseboards or window sills. Hollow sound when tapping structural wood nearby. Requires professional inspection.
Winged Ants Indoors: What It Means
Finding winged ants (reproductives) emerging from a wall, floor, or ceiling — particularly in spring — is the clearest sign of an established colony inside the structure. A colony does not produce reproductives until it has reached sufficient size and maturity, typically 3–5 years for carpenter ants. Winged carpenter ants indoors in winter or early spring mean there is an established carpenter ant colony in the structure's wood, not just foragers from outside. This warrants a professional inspection to identify the nest location and moisture condition that supports it. D&D Pest Control treats ant infestations throughout Franklin County and rural Missouri — visit ddpestcontrolmo.com.