HiveMind AI

Fall feeding: when to start, how much, and when to stop

By HiveMind AI ·

Every autumn someone in our club feeds a light colony right up to the first hard frost, feels good about it, and opens the hive in March to find the bees dead on top of frames of uncapped, watery syrup. They did not starve. They were fed too late, and the question of when to stop turns out to matter more than the question of when to start.

This is what we have settled on, with the sources that settled it. Where they disagree, the disagreement is in the text rather than smoothed over.

Heavy syrup, and why the ratio matters

Fall syrup is two parts sugar to one part water. Alabama Extension gives it by weight: "2 parts sugar to 1 part water by weight, or 2 lbs. of sugar for every 1 lb. (2 cups) of water". Honey Bee Suite says the same mix can be measured "by either weight or volume"; the bees do not notice the difference, and the sugar dissolves either way once the water is hot. Mississippi State's guide puts the same idea in bulk terms, "16-17 pounds [of sugar to] 1 gallon" (MSU Extension).

The reason for the heavy ratio is in that first sentence: "Fall syrup resembles honey and bees tend to store it for winter" (Honey Bee Suite). Thin spring syrup imitates a nectar flow and stimulates brood rearing, which is the opposite of what a colony needs in October. Heavy syrup has less water for the bees to drive off before they can cap it, and in autumn the hours of warm weather for driving water off are the thing running out.

Do not feed it while supers are on. Syrup stored above the brood nest is syrup in your honey.

How much the colony needs

The target is a weight, not a feeling. The figures below are what each source says a full-size colony should carry into winter; they are different because the winters are different.

  • Alabama Extension: "approximately 60 lbs. (1 medium super) of honey".
  • Mississippi State Extension: "at least 60 to 65 pounds of honey or stored syrup positioned above the cluster of bees in late autumn".
  • Cornell, for New York: "A full size hive (two deep Langstroth boxes or equivalent) needs a minimum of 80 pounds of honey. A nuc should have no less than 50 pounds."
  • Honey Bee Suite, the whole spread: "Colonies in the southern U.S. may thrive on as little as 40 pounds (18 kg), those in the middle states need about 60 pounds (27 kg), and northern bees may require 80 or 90 (36-41 kg)."

So the honest answer is: ask your own extension service or the keeper two roads over who has wintered bees for twenty years, and treat the Gulf Coast's 40 and Minnesota's 90 as the ends of one scale rather than as a contradiction. A large cluster eats more than a small one, and a long confinement eats more than a short one.

Translating weight into frames, Honey Bee Suite's rule of thumb is that "a full deep frame holds about 8 pounds (4 kg) of honey and full medium holds about 6 pounds (3 kg)", and "a full ten-frame deep weighs 80-90 pounds". Heft the back of the hive now, while you can still do something about what you feel, and heft it again after the first cold snap. The same hands on the same hive are a better scale than the number suggests; a luggage scale under the back edge is better still, if you want a figure you can compare to last year's.

The temperature that ends liquid feeding

Bees take syrup as long as it is warm enough to take. Alabama Extension puts the line plainly: "Liquid feed should be used when temperatures are above 50° F", solid feed below it. Honey Bee Suite says the same thing from the syrup's side: it "can be fed in the fall until the syrup itself reaches about 50°F (10°C)". Note the word syrup. A feeder on top of a hive on a 55°F afternoon holds liquid that was 40°F at dawn and has not caught up, and a cold cluster will not break to reach it.

Then there is the problem that the 50°F rule exists to prevent. Syrup the bees take but cannot cure sits in the comb as unripened stores, and the cold is what stops them curing it. Honey Bee Suite: "Cold air can hold less moisture than warm air, so in a cold hive no amount of fanning will evaporate the water from cold syrup." MSU adds the cost on the bees' side: "Feeding syrup in extremely cold weather can chill honey bees because they need to evaporate water." Uncapped syrup in a cold hive is a humidity source over the cluster all winter, and if the stores are thin enough it ferments. That is the March hive we opened with: fed, full, and dead.

When to stop, which is the date the sources argue about

Everyone agrees feeding must be finished while the bees are still flying and the nights are still mild. They do not agree on the calendar, because the calendar is local.

MSU Extension, writing for Mississippi, says "it is best to finish this supplemental feeding by the end of October". Cornell, writing for New York, is a month earlier and blunter: feeding "MUST be done in the fall when the bees are still active", and "You will not be able to count on feeding hives past the end of September."

A month apart, both right. The rule underneath both is the temperature rule above, read against your own first-frost date: work back from the week your nights reliably drop into the 40s, give the bees two or three weeks of warm afternoons to take and cure the syrup, and that is your start date. If you are starting after your neighbours have stopped, you are not feeding for winter stores any more. You are feeding for the next section.

Switching to solid sugar

Once it is too cold for syrup, the feed changes form rather than stopping. Alabama lists the options: "Solid feed can take multiple forms, including fondant, sugar cake, or mountain camp", with one warning worth repeating because it catches people every year: "baker's fondant is not the same product as beekeeping fondant and should not be used." Penn State's seasonal guide describes the northeast practice: "winter feed as fondant or hard sugar, which is placed on top of the uppermost frames inside the hive", because "Honey bees are unable to consume cold supplemental syrup" (Penn State Extension).

Understand what solid feed is for. Honey Bee Suite draws the line: fall syrup builds winter reserves through storage, winter sugar "simply prevents starvation", eaten as it is reached rather than stored. Fondant on the top bars in December is insurance against a cluster that has eaten its way to the lid. It is not a substitute for the 60 to 90 pounds you should have put under them in September. Cornell times the first check for "late February or early March", with fondant ready "if you need to feed as early as February", and notes bees will take it during warm spells around 40°F.

Robbing: the other reason to feed carefully

A yard in dearth is a yard where every colony is looking for someone else's stores, and nothing announces an open bar like a spilled gallon of syrup. A 2024 review in Insects describes the trigger as a "severe reduction in honey flow, or when nectariferous plants are coming to an end", and the victims as colonies "vulnerable due to a weak defensive system or poor management", exactly the light colony you are feeding. Its prevention list reads like a fall-feeding checklist: narrow the entrances, seal cracks that leak the smell of honey, "Provide high-concentration sugar syrup during nectar dearth", and "Feed colonies at night to minimize robber bee detection".

Alabama Extension is specific about the hardware: "Entrance feeders should not be used in any season except spring, as they may encourage robbing", and open feeders "are not recommended. They may encourage robbing and spread disease." Feed inside the hive, top feeder or frame feeder, fill it at dusk, do not drip on the landing board, and reduce the entrance on every colony in the yard the same day, not just the one being fed. Our piece on what a hive tells you before you open it covers how robbing looks and sounds from ten feet away, which is where you want to catch it.

The mite check that belongs in the same week

Feeding a colony with a high mite load fattens the mites. The Honey Bee Health Coalition's current guide adds a note to its dormant-season threshold that fits here: "Sample just prior to clustering to determine whether bees are healthy going into dormancy" (Tools for Varroa Management, ninth edition). The same warm afternoons that let bees take syrup are the last afternoons a treatment will work, so the wash and the feeder go on the same calendar line.

What we write down

For each colony: the hefted or weighed estimate before feeding, how much syrup it took (gallons are fine, the bees do not need precision), the date the last feeder came off and the overnight low that week, and whether it went to fondant and when. In spring, the two columns that matter are stores-at-the-last-feed and what you found in March, because that is how you learn what your yard's 60 or 80 pounds really is.

In HiveMind AI, a feeding is a field-log entry you can record once across every hive you fed that evening, and the dates sit on each hive's own timeline beside its mite checks, so next September you can see what the colony that died was carrying and when it was last fed. A ruled notebook with a column per hive does the same job. The habit is the tool.

Sources

  • Alabama Cooperative Extension System, Supplemental feeding for honey bees: https://www.aces.edu/blog/topics/bees-pollinators/supplemental-feeding-for-honey-bees/
  • Mississippi State University Extension, Colony growth and seasonal management of honey bees (P2941): https://extension.msstate.edu/publications/colony-growth-and-seasonal-management-honey-bees
  • Cornell CALS Pollinator Network, Overwintering: https://cals.cornell.edu/pollinator-network/beekeeping/overwintering
  • Penn State Extension, Honey bee management throughout the seasons: https://extension.psu.edu/honey-bee-management-throughout-the-seasons
  • Honey Bee Suite, Sugar syrup ratios; Winter feed Q and A: liquid vs solid sugar; The remarkable amount of honey your bees need for winter: https://www.honeybeesuite.com/
  • Honey Bee Health Coalition, Tools for Varroa Management, ninth edition (June 2026): https://honeybeehealthcoalition.org/tools-for-varroa-management-guide-9th-edition/
  • Insects (2024), Honey robbing: causes, impacts and preventive measures: https://pmc.ncbi.nlm.nih.gov/articles/PMC11765616/