April in Ontario: The First Full Inspection
- Melissa Honey House
- Apr 15
- 3 min read
April marks the beginning of true spring activity in the apiary. While weather in Ontario can still be unpredictable, longer periods of mild temperatures allow for the first full inspection of the season.
This is the point where winter outcomes become clear and the season begins to shift from observation to active management.
Timing the First Inspection
The first full inspection should take place on a warm, calm day, ideally when temperatures reach 12–15 °C (54–59 °F) or higher.
Conditions matter more than the calendar. Colonies should be flying, and inspections should be carried out efficiently to avoid chilling brood.
Confirming Winter Outcomes
The first inspection provides a clear answer to the most important question: which colonies have come through winter successfully.
Hives that were quiet in March can now be properly assessed. At this stage, it becomes evident whether a colony survived.
If a colony has not survived, take time to observe and record the condition inside the hive. The position of the cluster, remaining food, and signs of moisture can offer valuable insight into the cause of the loss.
These observations are important. Understanding winter losses helps inform future management decisions.
If the equipment is suitable, the hive can be cleaned and prepared for reuse later in spring.
Evaluating Colony Strength
Once survival is confirmed, the next step is to assess colony strength.
Observe:
• Population size
• Brood area
• General activity
Some colonies will already be expanding, while others develop more slowly. These early differences often influence how colonies perform through the season.
Confirming the Queen
A key part of the inspection is confirming that the colony is queenright.
Look for:
• Eggs
• Young larvae
• A consistent brood pattern
The presence of eggs is the most reliable sign that the queen is active and laying.
Cleaning and Hive Condition
Winter often leaves behind moisture, debris, and dead bees.
During inspection:
• Clean or replace bottom boards if needed
• Remove excess debris
• Check for mold or moisture
A clean, dry environment supports early brood development.
Checking Food Stores
Even in April, colonies can still be at risk of starvation.
After a long winter, some hives may be low on or completely out of food, especially if early spring weather limits foraging. At the same time, brood rearing increases energy demand.
Check that honey stores remain available near the brood area. If reserves are low, feeding may still be required until a consistent nectar flow begins.
Monitoring and Early Varroa Management
As colonies begin to expand, it is also a good time to consider varroa mite levels.
While mite populations may still be relatively low in early spring, they will increase as brood production accelerates. Early awareness helps guide decisions later in the season.
If conditions allow, April can be an appropriate time to monitor and, if needed, apply an early treatment, depending on your management approach.
Supporting colony health at this stage contributes to stronger development through the spring.
Early Signs of Expansion
With improving conditions, colonies begin to expand more rapidly.
You may notice:
• Increasing brood area
• Growing population
• More consistent flight activity
Cleansing flights observed during winter give way to pollen flights, as bees begin bringing pollen into the hive. This marks a clear shift toward sustained brood rearing.
At this stage, drone brood often begins to appear. The presence of drones indicates that the colony is moving beyond survival and into active seasonal development. In strong colonies, drone production may increase quickly over the coming weeks.
This change is significant. Drone production requires considerable resources, and its appearance often precedes swarm preparation.
From a management perspective, drone brood is also important to observe because varroa mites preferentially reproduce in drone cells. Monitoring drone brood can provide an early indication of mite activity as the season progresses.
Taken together, increasing brood, pollen intake, and the appearance of drones signal that the colony is entering a phase of rapid growth. Strong colonies identified at this stage may later be suitable for splits or other management decisions.
Moving into the Season
April marks a clear transition. Colonies move from winter survival into active development, and inspections become more regular.
Decisions made now—regarding feeding, colony balance, and health—will shape how colonies build into the main season.
April Reflections
Spring has begun, but conditions in Ontario remain variable. Warm days may be followed by sudden cold periods, and colonies continue to adjust.
The first full inspection provides a clear picture of colony condition after winter. From this point forward, the focus shifts toward supporting growth and preparing for the active months ahead.
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