What Is the Life Cycle of Hornets? One Queen, Four Stages
What is the life cycle of hornets? It runs through four stages, egg, larva, pupa, and adult, and the whole colony restarts from a single mated queen every spring. Unlike a honeybee hive, a hornet nest does not survive winter; only new queens do, tucked into bark crevices or leaf litter until the weather warms again.
What Counts as a Hornet
True hornets belong to the genus Vespa, the largest social wasps in the family Vespidae. The European hornet (Vespa crabro) is the only true hornet established in the United States, with workers running close to an inch long and queens reaching about 1.3 inches. The northern giant hornet (Vespa mandarinia), the species behind the “murder hornet” headlines, is larger still: UF/IFAS reports that both workers and queens run close to 2 inches (5.08 cm) in length, with a smooth stinger nearly a centimeter long.
Species commonly called “hornets” in everyday conversation, like the bald-faced hornet (Dolichovespula maculata), are actually yellowjackets rather than true Vespa hornets, according to Iowa State University Extension. Nesting habits split along the same lines: European hornets build paper nests inside hollow trees or wall voids, while bald-faced hornets hang exposed, football-shaped paper nests from tree branches, shrubs, or eaves.
Egg Stage
A fertilized queen who survived winter emerges alone in spring, picks a nest site, and builds a small paper comb from chewed wood fiber and saliva. She lays the first eggs herself, one per cell, with no help from workers yet, since none exist. Over the life of a European hornet colony, the queen and later the workers can fill well over a thousand cells as the nest expands through the season.
The eggs are small, oval, and pale, typically hatching within about a week depending on temperature.
Larva Stage
Newly hatched larvae are legless, eyeless grubs that cannot feed themselves. For the first brood, the queen alone hunts insects, chews them into a paste, and feeds each larva directly while also sipping tree sap and nectar herself. Once that first batch of workers emerges, they take over foraging and brood care, and the queen stops leaving the nest to focus entirely on laying eggs.
Larvae molt through several instars over one to two weeks, growing quickly on a protein-heavy diet of caterpillars, flies, and other insects the workers bring back.
Pupa Stage
Each larva caps its cell with silk and pupates inside, reorganizing its body from a soft grub into a winged adult with compound eyes, legs, and a hardened exoskeleton. This stage typically runs one to two weeks. The pupa is pale and motionless if a cell is opened, but under normal conditions it stays sealed until the adult chews its way out.
Adult Stage
Adults that emerge through summer are almost all sterile female workers. A mature European hornet nest holds somewhere between 200 and 400 workers by September, according to Penn State Extension, and some colonies reach closer to 1,000.
Worker Roles
- Nest expansion: workers add new cells and paper envelope layers as the colony grows through summer.
- Foraging: workers hunt grasshoppers, flies, and other insects for protein, then shift toward sugar sources like tree sap and fallen fruit in late summer and fall.
- Brood care: workers feed larvae and help regulate temperature inside the nest.
- Nest defense: workers sting to defend the colony, and because their stinger is smooth rather than barbed, a single hornet can sting repeatedly without dying, unlike a honeybee.
New Queens and Males
Late in the season, the colony raises reproductive males and future queens instead of more workers. These mate away from the nest, the males die shortly afterward, and mated queens seek overwintering shelter while the rest of the colony, including the founding queen, dies off with the first hard frost.
Why the Colony Restarts Every Year
Because only mated queens survive winter, each spring’s nest is founded from scratch rather than inherited. That single-founder bottleneck is also part of why hornet colonies stay far smaller than honeybee hives, which carry tens of thousands of workers through winter on stored honey instead of dying back to one survivor.
A Few More Hornet Facts
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Repeat stingers: because their stinger lacks a barb, hornets can sting multiple times during a single defense of the nest.
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Mixed diet: hornets hunt insects for protein but also drink tree sap, nectar, and rotting fruit, especially as the season winds down.
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Not always aerial nesters: European hornets favor hollow trees and wall cavities over open branches, unlike the exposed nests built by bald-faced hornets and paper wasps.
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Only one true hornet in North America: the European hornet is the sole established Vespa species in the continental US; most other insects Americans call “hornets” are yellowjackets.
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Giant hornet size: the northern giant hornet is the largest hornet species on record, with workers and queens both approaching 2 inches long.
The Bottom Line on Nest Timing
A hornet nest spotted in July is only a few months old and will be empty by winter regardless of what happens to it. The queens that matter for next year are the ones you are unlikely to see: overwintering singly in bark crevices, compost, or leaf litter until spring starts the four-stage cycle again.
