Stage 1: colony founding (year 0-1)
After a spring mating flight, a fertilized carpenter ant queen finds a suitable nesting site — in BC, almost always in moist wood or under bark — and excavates a small founding chamber. She seals herself in, lays the first batch of eggs, and raises the first workers entirely on stored fat reserves from her wing muscles. No worker assistance, no foraging. The first workers (called nanitic workers — smaller than normal) emerge 6-8 weeks later and begin foraging to feed the queen and subsequent brood. Colony survival depends entirely on the queen's fat reserves during this phase; founding is the most failure-prone stage of the colony lifecycle.
Stage 2: colony growth (years 1-4)
Once the first workers are foraging, colony growth accelerates. The queen's egg-laying rate increases as worker numbers increase and food supply stabilizes. In carpenter ant colonies, the queen can live 25+ years and may ultimately lay hundreds of thousands of eggs over her lifetime. The colony typically remains below 1,000 workers in years 1-3, making it nearly invisible to homeowners — minimal frass production, rare worker sightings, small gallery area. This is the window where treatment is cheapest and easiest, if the colony can be detected at all.
Stage 3: colony maturity and reproduction (years 4+)
A mature carpenter ant colony produces winged reproductives (alates) — male and female ants destined to found new colonies. This is the first visible indicator many homeowners notice. The swarm is the colony's reproductive investment — the queen shifts resources from worker production to alate production for several months each spring. After swarmers disperse, the colony returns to worker production. A colony that has swarmers is a colony with significant gallery infrastructure in your structure.
The queen's role in treatment
The queen is the reason spray-and-repeat fails. Worker ants live 1-3 years; a new generation of workers is constantly being produced from the queen's egg-laying. Kill all the workers and the queen simply produces more. Non-repellent bait works because workers carry the active ingredient back and feed it to the queen via trophallaxis. Once the queen dies, the colony's reproductive capacity ends. Existing workers die off without replacement, and the colony declines to zero over 2-6 weeks.
Multiple queens: the satellite colony problem
Mature carpenter ant colonies sometimes develop satellite nests — secondary nests that house workers and brood but not the main egg-laying queen. In BC homes with multiple moisture sources (e.g., roof leak plus wet crawlspace), a single colony can have the primary queen in one location and satellite nests in two or three others. This is why frass can appear in multiple unconnected locations simultaneously. Treatment that reaches only one satellite while missing the queen produces temporary improvement followed by full recovery.
Pavement ant colony lifecycle: shorter and simpler
Pavement ant colonies mature faster than carpenter ant colonies — typically producing swarmers within 2-3 years and reaching colonies of 3,000-5,000 workers. Multiple queens within the colony are common (pavement ants are polygyne — many-queened). This is why pavement ant colonies can recover so quickly from surface-level spraying: killing visible workers has minimal effect when multiple queens are producing replacements. Bait effectiveness relies on trophallaxis carrying the active ingredient to multiple queens simultaneously.