How Heavy Should a Hive Be
for Winter in Ontario?
Fall Weight and Feeding Guide
According to the Government of Ontario and the Ontario Beekeepers’ Association Technology Transfer Program, a colony on a single brood chamber should weigh at least 32 kg (70 lbs) before winter, and a colony on a double brood chamber at least 45 kg (100 lbs). These are minimum benchmarks for total hive weight — including boxes, frames, bees, and stores — not just the honey weight alone. The OBA’s feeding guide references 70-90 lbs for a single and 100-120 lbs for a double as the practical range, with the lower numbers being the minimum and the upper numbers providing a safety margin for a long Ontario winter.
Yes — the Ontario winter weight benchmarks (70 lbs minimum for single, 100 lbs minimum for double) refer to total hive weight including all equipment: brood boxes, frames, bottom board, inner cover, outer cover, and the colony itself. They are not stores-only figures. This means that two beekeepers using different equipment — lightweight poly boxes vs heavier wooden boxes — will have different total hive weights even when they have the same amount of honey stored. To use the benchmarks accurately, you should know your approximate empty equipment weight and subtract it to estimate actual stores. A typical two deep wooden Langstroth setup with frames weighs approximately 40-45 lbs empty — meaning a double brood colony at the 100 lb minimum has roughly 55-60 lbs of stores plus bee weight.
Yes — a luggage scale is one of the most practical low-cost tools for estimating hive weight. The most accurate method is to weigh both the front and back of the hive separately and add the readings together. A common shortcut is to lift only the rear of the hive and double the reading — this provides a reasonable estimate when weight is distributed relatively evenly, but it is only an approximation. For consistent monitoring across the fall feeding period, use the same method and the same attachment point on every measurement so that changes are comparable even if the absolute number is an estimate. A luggage scale with at least 50 kg / 110 lb capacity and a hold function (freezes the reading after you step back) is the most practical choice.
The correct 2:1 sugar syrup recipe is two parts white granulated sugar to one part water, measured by weight — not volume. Example: 2 kg sugar dissolved in 1 kg (approximately 1 litre) of water. Heat the water, remove from the heat source, add sugar gradually while stirring until fully dissolved, then allow to cool before filling feeders. Use only white granulated cane or beet sugar — no brown sugar, icing sugar, raw sugar, or artificial sweeteners. The higher sugar concentration of 2:1 compared to 1:1 means bees need to evaporate less water during processing, making it more efficient for stores building in Ontario’s cooling September weather.
Stop liquid syrup feeding based on temperature and bee behaviour — not a fixed calendar date. When night temperatures consistently approach or drop below 10-13°C, bees slow their syrup uptake and cannot efficiently process and reduce the moisture content to safe storage levels. Practical signs that liquid feeding is becoming ineffective: syrup sits in the feeder untouched or only slightly reduced between visits, bees are taking the syrup very slowly, and overnight temperatures are frequently cold. In northern Ontario this threshold typically arrives in early to mid-September; in central and southern Ontario, it may extend closer to late September or early October in a warm year. When liquid feeding becomes ineffective, fondant placed directly on the top bars above the cluster is the appropriate emergency supplement according to OBA guidance — though it is less reliable than proper fall syrup feeding and not a substitute for it.
Yes — a hive at target weight can still fail in winter for reasons unrelated to stores. The three most common causes of winter colony loss in Ontario beyond starvation are: uncontrolled Varroa mite loads that weaken the winter bee generation before they even enter the cluster (the leading cause of winter loss according to OBA data), a failing or absent queen that was not detected in September, and a colony population too small to generate sufficient cluster heat during extended cold snaps — regardless of available food. A well-fed colony headed by a failing queen in a cluster of 5 frames will still die in February. This is why the September health and Varroa assessment must come before feeding decisions — syrup cannot fix any of those underlying problems.
📋 In This Article
- Ontario Winter Hive Weight Targets
- Check Colony Health Before You Add Feed
- How to Weigh a Beehive Without a Hive Scale
- How Much Fall Syrup Does the Colony Need?
- How to Make 2:1 Sugar Syrup for Fall Feeding
- Preventing Syrup Fermentation and Mold
- When to Stop Liquid Feeding in Ontario
- What If the Hive Is Still Light After Liquid Feeding Ends?
- Best Fall Feeders for Ontario Hives
- Final Ontario Winter-Weight Checklist
Insufficient stores are one of the most preventable causes of winter colony failure in Ontario — but feeding every hive by the calendar is not the answer. Two colonies in the same apiary can have very different stores after the same summer. Weigh or estimate each colony individually, then feed according to the actual deficit. And before you invest a single litre of syrup: verify the colony is healthy enough to be worth feeding. A heavy hive is not necessarily a healthy hive.
What Is the Target Winter Hive Weight in Ontario?
Why a Universal Number Can Be Misleading
The benchmarks above are starting points, not guarantees. Equipment weight varies significantly between setups: a single deep wooden Langstroth box with ten frames weighs roughly 18-22 lbs empty; a lightweight poly box with the same frames may weigh 10-14 lbs. Two colonies can show the same total hive weight on a scale while carrying very different amounts of actual food stores. Know your approximate empty equipment weight — ideally by weighing an empty box and frame set — so you can back-calculate the stores estimate from your total reading.
Store distribution matters as much as total weight. Honey concentrated entirely in the upper box while the lower box is empty can leave the winter cluster isolated from food if temperatures prevent them from breaking cluster to move downward. A good September inspection confirms stores are present in both boxes, or that the configuration allows upward movement toward stores as the cluster naturally moves through winter.
Check Colony Health Before You Add Feed
Feeding a sick colony or a colony too weak to survive winter is a poor investment of time and resources. Before deciding how much syrup to prepare, run through this health check. Any issue on this list must be addressed — syrup alone cannot fix it.
☐ September Colony Health Checklist — Before Feeding
- Is the colony queenright? — fresh eggs or young larvae confirm a laying queen
- Does the colony have sufficient population? — minimum 7 frames of bees covered (OBA reference for colder Ontario regions)
- Has the post-treatment Varroa alcohol wash been done? — target below 1% (3 mites / 300 bees)
- Are there any signs of American Foulbrood, Nosema, or other disease?
- Is the colony strong enough to defend stored food against robbers?
- Is the brood pattern reasonably solid — or patchy and scattered suggesting queen failure?
A Colony Below 5-6 Frames of Bees Is a Combining Candidate — Not a Feeding Project
A colony too small to generate cluster heat will not survive an Ontario winter regardless of how much syrup you add. According to OBA guidance, approximately 7-8 frames of covered bees is the minimum for colder Ontario regions. A colony significantly below this threshold is better combined with a healthy donor colony using the newspaper method — its bees contribute to a larger surviving cluster rather than dying alone in February. Only combine with a disease-free colony.
How to Weigh a Beehive Without a Hive Scale
- No equipment needed
- Takes 10 seconds per hive
- Good for relative comparisons
- Cannot give a kg or lb reading
- Accuracy improves with practice
- $10-20 cost — buy once
- Gives kg / lb estimates
- Tracks progress across visits
- Front + back = best accuracy
- Rear × 2 = rough estimate only
- Continuous monitoring possible
- Eliminates measurement error
- High cost per hive
- More practical for 5+ hive apiaries
- App integration available on some models
The Luggage Scale Method — Step by Step
Luggage Scale Buying Criteria for Ontario Beekeepers
Look for: minimum 50 kg / 110 lb capacity (heavier colonies exceed this on a double setup), a strong J-hook or strap attachment, a hold or lock function so the reading freezes after you lower the hive, a clear display readable in autumn light, and lb/kg toggle. Avoid scales with thin plastic hooks — bottom board edges are rough and can snap cheap hooks after a few uses.
How Much Fall Syrup Does the Colony Need?
The Government of Ontario’s Best Management Practices document references approximately 15 litres (4 gallons) of supplemental feed as a typical requirement for a full-sized colony. This is a general reference, not a dose to apply uniformly — a colony already at target weight needs no syrup at all, while a colony 10 kg below target needs significantly more.
To calculate your colony’s actual syrup requirement: estimate the current weight, subtract from the target, and account for processing losses. When bees process 2:1 syrup into stores, they evaporate water — roughly 1 litre of 2:1 syrup produces approximately 0.75-0.8 kg of stored honey equivalent. Divide your stores deficit in kg by 0.75 to estimate the litres of syrup needed. A colony 8 kg below target needs approximately 10-11 litres of syrup. Re-weigh after each major feeding to track actual stores accumulation — do not assume all syrup fed was stored.
Simple Deficit Calculator
Step 1: Weigh the hive (front + rear luggage scale reading). Step 2: Subtract your known empty equipment weight to estimate current stores. Step 3: Subtract current stores from your target (45 kg / 100 lbs for double brood, 32 kg / 70 lbs for single). Step 4: Divide the deficit in kg by 0.75 to get litres of 2:1 syrup needed. Re-weigh after every 5-7 litres fed to confirm uptake.
How to Make 2:1 Fall Syrup Safely
Standard Canadian Recipe: Sugar and Water
- 1Heat water to approximately 60-70°C — warm enough to dissolve sugar quickly, not boiling. Boiling water can begin caramelizing sugar and increase HMF formation.
- 2Remove from direct heat before adding sugar. Adding sugar to water still on the burner increases the risk of scorching.
- 3Add sugar gradually while stirring until fully dissolved — no visible granules remaining. Takes 5-10 minutes for a large batch.
- 4Allow to cool to below 35-40°C before filling feeders. Hot syrup increases hive condensation and can temporarily disorient bees near the feeder.
- 5Fill feeders promptly. Store any surplus in a sealed food-grade container in a cool location or refrigerate.
Does Sugar Syrup Need to Be Inverted?
Sucrose (table sugar) is a disaccharide — bees must split it into glucose and fructose using the enzyme invertase before they can store it as honey. This inversion happens naturally during bee processing: bees add invertase from their salivary and hypopharyngeal glands as they work the syrup. Standard 2:1 syrup made from white granulated sugar does not need to be pre-inverted before feeding — bees handle the conversion themselves as part of their normal stores-building process. You do not need to take any additional steps.
Can You Add Citric Acid?
Some beekeeping traditions acidify sugar syrup with a small amount of citric acid to partially invert the sucrose and lower pH, which can slow microbial growth. This is a practice with a rationale — but citric acid is not required in the standard Canadian 2:1 fall-feeding recipe and is not necessary when syrup is prepared fresh and used promptly. There are two risks that make it unsuitable for a beginner’s standard batch:
- — Excessive acidity combined with prolonged heating or warm-temperature storage can increase HMF (hydroxymethylfurfural) formation — a compound that becomes toxic to bees at high concentrations
- — Dosing “by eye” or without measuring precisely produces unpredictable results — the margin between a useful pH reduction and a harmful one is narrow
If you choose to acidify, use a verified recipe with a precise gram measurement, do not boil the syrup after adding the acid, and use the batch promptly rather than storing at room temperature. For most Ontario beekeepers preparing fall syrup for immediate use, plain white sugar and water is the correct and sufficient approach.
✗ What Not to Add to Fall Syrup
- Brown sugar, raw sugar, or icing sugar — molasses in brown sugar causes bee dysentery during winter confinement; icing sugar contains cornstarch bees cannot digest
- Artificial sweeteners — no nutritional energy value for bees
- Honey from unknown sources — risk of introducing American Foulbrood spores
- Essential oils or aromatic supplements as preservatives — do not resolve the root cause of fermentation and can increase robbing pressure or alter feeding behaviour
Cooling, Storage and Signs of Fermentation
The most effective way to avoid fermentation is to prepare quantities you can use within 3-5 days and store surplus in a sealed food-grade container in a cool location or refrigerate. 2:1 syrup’s higher sugar concentration already inhibits microbial growth more effectively than 1:1 — large batches kept at room temperature in warm September weather are the main practical risk.
Clean feeders before refilling — residue from previous batches can introduce yeast that accelerates fermentation of fresh syrup. Discard any syrup that smells sour or alcoholic, produces foam or bubbles, or shows visible mold — feeding fermented syrup wastes bee processing effort and may add poorly concentrated moisture to winter stores.
When Should Ontario Beekeepers Stop Liquid Feeding?
The decision to stop liquid syrup feeding should be based on temperature, bee behaviour, and syrup uptake rate — not a calendar date. Ontario’s regions vary enough that a single cutoff date is not accurate for all beekeepers in the province.
| Ontario Region | Typical Feeding Window | Key Signal to Watch |
|---|---|---|
| Northern Ontario | Closes earlier — often early to mid-September | Cold nights arrive sooner; watch syrup uptake closely from late August |
| Central & Eastern Ontario | Generally mid-to-late September | Rainy cold periods can shorten the window unpredictably in any year |
| Southern Ontario | Can extend into early October in warm years | Do not count on the extra time — feed aggressively from August just in case |
Signs That Liquid Feeding Is Becoming Ineffective
Stop syrup feeding when you observe any of these: syrup sitting in the feeder largely untouched between visits; bees taking syrup very slowly or ignoring it; overnight temperatures frequently near or below 10°C; and the colony is not gaining meaningful weight between your measurements. At this point, liquid syrup is no longer being processed efficiently — continuing to fill feeders is unlikely to improve stores and may increase hive humidity.
What If the Hive Is Still Light After Liquid Feeding Ends?
If a colony has not reached target weight when temperatures prevent further liquid syrup feeding, fondant is the appropriate emergency supplement according to OBA guidance. Fondant placed directly on the top bars above the cluster is accessible to bees at any temperature without requiring them to process moisture — they eat it directly.
Important — Dry Sugar and Fondant Are Not Equivalent to Proper Fall Feeding
The OBA notes that dry sugar fed to a weak or starving colony may not be consumed effectively — bees require water to process dry sugar and a weak winter colony may not have the strength to forage for water. Fondant is more accessible than dry sugar but still less reliable than proper fall syrup feeding completed while temperatures allowed it. Fondant is emergency insurance, not a substitute for the fall preparation window. A colony that enters winter with 20 kg of fondant and 20 kg of capped honey is at significantly higher risk than one that entered October with 40 kg of capped stores.
Best Fall Feeders for Ontario Hives
| Feeder Type | Advantage | Limitation | Fall Rating |
|---|---|---|---|
| Enclosed top feeder (10L+) | Large capacity, internal access, minimal hive disturbance on refill | Must be watertight; inspect for leaks before fall | ✅ Best choice |
| Pail feeder (inverted bucket) | Simple, inexpensive, available in large sizes | Requires an empty super rim to sit in; syrup cools faster than inside a top feeder | ✅ Good option |
| Frame feeder (internal) | Inside brood box — warmest location, bees stay close | Small capacity (2-4L), requires hive opening to refill, drowning risk | ⚠️ Small capacity |
| Entrance feeder | Easy to observe and refill without opening the hive | Exposed syrup triggers robbing during fall dearth; syrup cools rapidly; too small for fall stores building | ✗ Not for fall |
Final Ontario Winter-Weight Checklist
☐ Complete Before October Wrapping
- Confirm the colony is healthy and queenright — brood inspection with eggs visible
- Retest for Varroa after treatment — target below 1% (3 mites / 300 bees) before investing feeding effort
- Identify your hive configuration — single or double brood box
- Weigh or consistently estimate the hive using luggage scale (front + rear method)
- Compare your reading against the Ontario benchmark — 70 lbs minimum single / 100 lbs minimum double (total hive weight)
- Feed 2:1 syrup according to the actual deficit — not a uniform calendar dose
- Use an enclosed top feeder or pail feeder — no entrance feeders in fall
- Re-weigh after every 5-7 litres fed to confirm stores are accumulating
- Stop liquid feeding when syrup uptake slows and nights approach 10°C — switch to temperature signals, not calendar dates
- Install fondant directly above the cluster before final wrapping if the colony is still below target weight when liquid feeding must end
Final Thoughts
The single most useful change an Ontario beekeeper can make to their fall routine is to weigh or estimate every colony individually before deciding how much to feed — rather than applying a uniform dose across the apiary. Two hives that look identical from outside can have a 10 kg stores difference after the same summer. The one that looked full without being checked is the one that dies in February.
The Government of Ontario sets the minimum at 32 kg (70 lbs) for a single brood box and 45 kg (100 lbs) for a double. Aim above those minimums. Feed according to the deficit. Use 2:1 syrup from day one. Stop when temperature signals tell you to, not the calendar. And remember: weight alone does not guarantee survival — a well-fed colony with high Varroa and a failing queen is still a colony that will not open in April. The health check comes first. 🐝⚖️🍂
Not sure if your hive is heavy enough? 🐝
Describe your hive configuration, estimated weight, and region to our AI assistant — we’ll calculate your syrup deficit and feeding plan for reaching Ontario winter weight before October.
🐝 Ask Bee Now — It’s Free🐝 WiseBee Disclosure
Affiliate Disclosure: This article contains Amazon affiliate links. If you purchase through our links, we earn a small commission at no extra cost to you. Learn more →
Disclaimer: This article is for educational purposes only and does not constitute professional apicultural or veterinary advice. Always consult a qualified beekeeper for guidance specific to your situation. Full disclaimer →
