Part of Beekeeping
The honey bee colony does not simply exist through the year — it breathes in and out with the seasons, swelling to 60,000 bees in summer and contracting to 10,000 in winter. Every colony behavior, from swarming to honey hoarding to the defensive sting response, makes sense only in the context of this annual cycle. Beekeeping management timed with the seasonal cycle succeeds; management that fights it fails.
Understanding the Cycle
The colony’s annual strategy is straightforward: build up population in spring to exploit the summer nectar flow, store surplus food for winter survival, reduce population in autumn to minimize food consumption, survive the cold months as a compact cluster, and repeat.
Climate determines the specifics of timing but not the strategy. In temperate climates with cold winters, the cycle is pronounced. In subtropical climates, the “winter” may be a dry season rather than a cold one, but the principle — period of scarcity followed by period of abundance — remains.
This article describes the temperate annual cycle. Adjust timing for your latitude and local climate, but the biological sequence is universal.
Late Winter / Early Spring: Colony Awakening
Colony State at Winter’s End
After months of cluster life, the colony emerges from winter reduced but intact. A typical healthy colony enters winter with 10,000-20,000 bees and a queen. It exits winter with 7,000-15,000 bees — losses from natural mortality during cluster, sometimes augmented by starvation if honey stores ran low.
At winter’s end (triggered by lengthening days more than temperature), the queen resumes laying on a small central patch of comb warmed by the cluster. She may begin laying as early as January in mild climates, even while snow is still falling outside.
The Critical Bottleneck
Early spring is the colony’s most vulnerable moment. The cluster is small, stores may be low, and the colony needs to begin rearing brood — which requires warmth, food, and nurse bees. If stores run out before the first pollen and nectar arrive, the colony starves just as conditions are turning favorable.
A beekeeper should check colony weight or stores in late winter. A light hive needs feeding immediately. A candy board (fondant) placed directly above the cluster allows bees to eat without breaking cluster in cold weather. Pollen substitute patties encourage queen to ramp up laying.
Warning signs of late winter starvation:
- Light hive when lifted from the back
- Small cluster huddled at top of upper box (cluster has eaten upward through all stores)
- Bees crawling listlessly at entrance in cold weather
- Dead cluster with heads in cells — the classic “starved cluster” posture (bees died eating the last cells)
Early Spring Buildup
Once pollen begins arriving (willows, maples, and early crocus are critical early pollen sources), the colony accelerates. Each pound of pollen enables approximately 4,000 new bees to be reared. Colonies with early pollen access build up 4-6 weeks faster than those without.
The beekeeper’s role in early spring:
- Verify the queen is laying and pattern is solid
- Ensure adequate ventilation (winter ventilation boards off)
- Provide food if stores are low
- Do not inspect in cold weather — chilling brood sets the colony back significantly
Spring: Buildup and Swarm Preparation
Exponential Growth
A colony entering spring with a good queen and adequate stores grows exponentially. Population can double every 3-4 weeks during peak brood rearing. A colony of 15,000 bees in March can reach 50,000 by May in temperate climates.
This growth is driven by:
- Increasing day length triggering queen to ramp up laying
- Pollen abundance supporting nurse bee gland development
- Increasing temperatures allowing larger brood area to be maintained
Swarm Impulse
As the colony approaches maximum population density, the swarm impulse emerges. This is not a problem to be solved but a biological imperative — swarming is the colony’s primary reproductive strategy, equivalent to cell division. A colony that swarms is doing exactly what its biology demands.
Conditions that trigger swarm preparation:
- Hive becoming congested — brood nest crowded, limited expansion space
- Decreasing queen pheromone distribution as colony grows too large for even pheromone distribution
- Accumulation of bees with no comb to build (idle wax gland bees)
- Presence of many young, nurse-age bees with low task assignment
Sequence of swarm preparation:
- Workers begin constructing queen cups (empty queen cell bases) along frame bottoms
- Queen begins laying eggs in queen cups — this is the point of no return
- Larvae develop in queen cells; workers reduce queen feeding (queen slims down for flight)
- On a warm, calm day with good weather forecast, the prime swarm departs
The prime swarm consists of the old mated queen and approximately 40-60% of the worker population. They cluster nearby (usually within 100 meters) for hours to days while scouts search for a new home. If they find an acceptable cavity, they move in. If not, they must move to another temporary cluster site.
After the prime swarm departs: The original colony contains several capped queen cells, remaining workers, all drones, and all stores. The first virgin queen to emerge kills her rivals (or, if multiple queens emerge simultaneously, they fight until one survives). The survivor takes mating flights over 1-2 weeks, then begins laying. The colony rebuilds.
Afterswarms may follow the prime swarm if there are multiple queen cells. An afterswarm is a smaller group leaving with a virgin queen — these are high-risk for the afterswarm colony (virgin queen must mate successfully) but allow the original colony to produce multiple daughter colonies.
Beekeeper Intervention in Swarm Season
Swarm prevention and management is the most demanding part of spring beekeeping. Options:
To prevent swarming:
- Add supers (additional boxes) before the colony runs out of space
- Remove frames of capped brood to a nucleus colony, replacing with empty frames (gives idle bees a building task, reduces congestion)
- Requeen with a young queen annually — young queens produce more pheromone and suppress swarm impulse more effectively
- Perform artificial swarms (split the colony) when swarm preparations begin
To capture a swarm:
- Place an empty box at swarm cluster location
- Knock or brush all bees, including queen, into the box
- If the queen is in the box, workers will fan Nasonov pheromone at the entrance and remaining bees will enter
- Move the box at night to the permanent hive location
See Colony Division for detailed splitting procedures, and Obtaining Bees for swarm capture methods.
Summer: Peak Production
Colony at Maximum Strength
Summer sees the colony at peak population — 50,000-80,000 workers depending on queen quality and forage availability. The main nectar flow produces surplus honey at a rate that can exceed 1 kg per day in ideal conditions. Workers are focused on foraging.
Drone population is high — several hundred to a few thousand drones per colony. Mating flights occur on warm afternoons.
Honey Processing
Incoming nectar (roughly 80% water, 20% sugars) is passed through trophallaxis from forager to house bee, mixed with enzymes from hypopharyngeal glands, and spread thin in cells for evaporation. Foragers returning with nectar fan the hive to increase airflow, accelerating moisture evaporation. When honey reaches approximately 17-18% water content, cells are capped with wax.
Honey is ripe (safe from fermentation) at around 17-18% water content. Uncapped honey may be unripe. The traditional test: hold a frame horizontally and shake — if nectar flies out, it is too wet to harvest. If nothing comes out, it is likely ripe.
Thermal Management
Summer hive temperatures can spike dangerously on hot days. Workers manage this by:
- Fanning intensively at the entrance to pull air through
- Collecting water and evaporating it inside the hive
- Clustering outside the hive (“bearding”) on hot nights to reduce interior temperature
Beekeepers in hot climates should provide shade and a nearby water source. A hive that cannot cool itself will fail to maintain brood temperature and the colony will decline.
Late Summer / Early Autumn: Preparation for Scarcity
The Dearth
In many temperate climates, there is a late summer dearth — a period after the main nectar flow ends when little or no nectar is available. Colonies that do not yet have adequate stores become defensive and stressed. Robbing behavior intensifies — colonies actively rob weaker neighbors.
Signs of dearth:
- Increased defensive behavior across all hives
- Fighting at hive entrances (robbing)
- Less forager traffic despite active bees
- Colonies consuming stored honey
Beekeepers should reduce hive entrances during dearth to minimize robbing. Do not feed honey in the open (creates robbing frenzy). Use inverted jar feeders inside the hive.
Drone Eviction
As days shorten and temperatures drop, the colony’s autumn preparation begins. One of the clearest signals: workers begin evicting drones. Drones are ejected from the hive and are unable to re-enter. Unable to feed themselves, evicted drones cluster at the entrance briefly before dying.
This is a reliable seasonal indicator. Drone eviction tells the beekeeper: the colony is shifting into winter preparation mode. Time management actions accordingly.
Autumn Foraging: Ivy and Late Flowers
In many climates, a secondary autumn nectar flow occurs from late-blooming plants. Common ivy is a critical late source in European climates. This flow can rapidly replenish stores but also presents a risk: ivy honey granulates quickly and can set solid in the comb over winter, making it inaccessible to bees. Some beekeepers harvest ivy honey and replace it with sugar syrup if the granulation risk is high.
Feeding for Winter
If stores are inadequate (target: 20-25 kg of capped honey for winter in temperate climates), feed heavy sugar syrup in autumn. Syrup concentration: 2 parts sugar to 1 part water by weight. Bees process and cap syrup as they would nectar.
Feed as early in autumn as possible — bees need time and warmth to process syrup. Syrup fed too late (in cold weather) cannot be capped before winter and may ferment.
Target store weights for winter:
| Climate | Minimum Stores |
|---|---|
| Mild (UK, Pacific Northwest) | 15-18 kg |
| Temperate (central Europe, northeastern US) | 20-25 kg |
| Harsh (Scandinavia, northern Canada) | 25-35 kg |
Autumn: Varroa Treatment Window
Before winter, the colony raises a cohort of long-lived winter bees that will survive until spring. These bees need to be as healthy and free from Varroa as possible. Mite damage to winter bees — which reduces lifespan and impairs immune function — is a major cause of winter colony loss.
The post-summer-solstice period, after the main flow and before winter bees are being reared, is the critical treatment window. With brood levels declining naturally, mite treatments are more effective because more mites are in the phoretic (on bees, not in cells) phase where they are exposed to treatments.
In a no-treatment scenario (post-collapse), select for naturally hygienic, low-mite colonies over multiple years. Accept higher winter losses as the cost of this selection.
Winter: The Cluster
Cluster Formation
As temperatures drop below approximately 14°C (57°F), bees begin forming a cluster — a compact sphere of bees centered on the remaining brood. The cluster contracts and tightens as temperatures fall.
Within the cluster, bees maintain the core temperature at 20-25°C (even without brood) by metabolizing honey and generating heat through muscle activity. The outer shell of the cluster serves as insulation — bees rotate from the cold outer shell to the warm interior.
The cluster does not hibernate. Bees remain metabolically active throughout winter, eating stored honey continuously.
Cluster Movement
The cluster moves slowly upward through the hive over winter, following its food supply. A cluster that reaches the top of its box and runs out of food directly above it will starve even if there is uncapped honey elsewhere on the same frame level. This is “isolation starvation” — a tragic and preventable death.
To prevent isolation starvation:
- Ensure food is directly above the cluster when placing bees for winter
- Check stores in January/February by hefting the hive
- In severe cold, move fondant directly onto the top bars above the cluster if stores are low
Ventilation in Winter
Condensation is the primary moisture problem in winter. Bees produce water vapor through respiration. If this vapor condenses on cold surfaces and drips on the cluster, bees chill and die.
Proper winter ventilation:
- Small lower entrance (reduces draft but allows CO2 escape)
- Upper entrance or ventilation slot at the top of the hive (allows moisture to escape)
- Breathable insulation above the crown board (absorbs moisture without blocking airflow)
A well-ventilated hive has dry, frosty condensation on cold inner surfaces. A poorly ventilated hive has running water.
The Beekeeper’s Seasonal Calendar
| Season | Colony State | Key Actions |
|---|---|---|
| Late winter | Cluster breaking, queen ramping up | Check stores, feed if light, clear entrance of dead bees |
| Early spring | Rapid buildup | First inspection (>12°C), check queen, add space |
| Mid spring | Swarm preparation | Weekly swarm checks, add supers, split if needed |
| Early summer | Peak population | Monitor honey flow, add supers before they fill |
| Summer | Maximum production | Harvest surplus honey, manage pests |
| Late summer | Dearth / robbing risk | Reduce entrances, stop open feeding |
| Early autumn | Drone eviction | Assess stores, feed heavy syrup if needed, Varroa treatment |
| Late autumn | Winter preparation | Final weight check, provide upper ventilation |
| Winter | Cluster | Minimal disturbance, heft monthly, fondant if needed |
The beekeeper who internalizes this cycle stops reacting to colony behavior and starts anticipating it. Swarm season is not a surprise — it is a scheduled event you can prepare for six weeks in advance. Winter starvation is not bad luck — it is a failure to check stores in February. The colony’s annual rhythm, once learned, becomes a predictable partner in production.