Definition
Harborage is the term pest control professionals use for any spot a pest uses as a hiding place, nesting site, or shelter — somewhere it can stay hidden, stay protected from weather and predators, and remain close to food or water. Harborage can be indoors or outdoors and looks different depending on the pest: cockroaches favor tight, warm cracks near appliances; rodents nest in wall voids, attics, and stacked clutter; ants and termites often harbor in mulch beds, woodpiles, or moisture-damaged wood.
Identifying harborage matters because it's usually the key to solving an infestation rather than just reducing it temporarily. If a technician treats visible pest activity but never locates where the colony or population is actually living and breeding, the problem tends to come right back. For example, finding a moisture-damaged wall void behind a kitchen cabinet that's sheltering a cockroach population lets a pest control company target treatment directly at the source, instead of repeatedly spraying baseboards where roaches are only passing through. Reducing harborage — clearing clutter, trimming vegetation away from the foundation, and storing firewood off the ground and away from the house — is also a standard part of prevention, since eliminating comfortable hiding spots makes a property far less attractive to pests in the first place.