07/06/2026
I removed a large bald-faced hornet nest and treated the area thoroughly.
Two weeks later, a new structure started forming on a nearby door k**b.
At first glance, it looks like the colony “came back”… but that’s not how bald-faced hornets work.
By July, colonies are already fully established, and workers cannot start a new colony without a queen.
The most likely explanation is that the original queen survived the initial treatment and remaining workers attempted limited rebuilding.
Without a functioning colony structure, brood, and sustained queen activity, these rebuild attempts typically fail quickly.
This is why follow-ups matter after large nest removals!