Can a colony collect too much pollen?

Frame-of-pollen. Bill Hesbach.

The standard answer to this question is no: “There is no such thing as too much pollen.” “The bees know what they are doing.” “Don’t worry about a good thing.” “Lots of pollen means lots of brood.”

I’ve heard all these arguments many times, so I found it especially interesting when this subject came up last year in a beekeeping class. The class had a large number of extremely experienced beekeepers, and among that group were people who added a qualifier to all these standard answers: usually. Most often lots of pollen is a good thing, but on occasion an excess of pollen can signal queenlessness or a soon-to-fail queen.

More pollen than necessary

Bill Hesbach, a Connecticut beekeeper, described how he had a colony that plugged every available cell with pollen. He wrote, “I thought pollen collection was stimulated by brood pheromones, but this hive just kept collecting pollen long after there was any need to do so. The hive population crashed, all the frames are basically plugged with pollen, and I have my first dead-out ever.”

Another beekeeper explained that when he sees frames with solid expanses of pollen shrinking the brood nest he becomes suspicious of queenlessness. It seems that even though the need for pollen has decreased, the rate of collection remains the same, and the combs soon become filled with pollen in excess of normal.

Personally, I’ve only seen this a few times, but I don’t keep hundreds or thousands of hives like some of the others. Still, in the instances I recall, the colonies had normal egg-shaped brood nests surrounded by arcs of pollen. But later inspections revealed these colonies had begun backfilling the nest with pollen until there were literally no cells for the queen to use.

Looking normal from the outside

The first time I noticed this I went into the brood box with the intention of removing some of the pollen to keep for later, but it was too late. The queen was gone and the colony was crashing. Oddly, from the outside everything looked normal: bees were coming and going carrying great loads of colorful pollen. Nothing seemed amiss.

Since the class ended, I’ve been trying to learn more about this phenomenon. Several commercial beekeepers have mentioned that the presence of massive amounts of pollen serves as a warning that the colony should be checked further. It may mean nothing—an excess of pollen may result from a genetic propensity to collect more than average. On the other hand, too much pollen could mean a failing queen. A quick inspection of the brood nest will tell the beekeeper if he can ignore it or not.

Too much pollen? Check your queen

I still haven’t found an explanation for the excess pollen. I don’t know why the bees keep collecting even though the need is steadily decreasing. Still, I like the solution outlined above and recommend it as a management technique: If you see too much pollen, check the queen and replace her if necessary. If the queen looks good, don’t worry about the pollen and let the bees do their thing in peace.


Too much pollen? This frame is packed from end to end.

Frame of pollen. If you think you are seeing too much pollen, check for the presence of a queen. Photo courtesy Bill Hesbach.


  • Pollen over collection and plugging up is very very common in Hawaii where there are year round sources of both nectar and pollen. We have to take out frames filled with pollen regularly or they indeed run out of space for brood rearing.

  • Thanks for posting on this! I have been wondering about what to think when I’ve seen an abnormal amount of pollen, especially when it’s not in the normal pattern around the brood. Last fall we had a colony with this and it did not make it over the winter. Now I know what to assess for if I see this situation again.

  • I believe pollen collection is stimulated by enthusiastic retrieval and the protein content of the feed given to foragers by the nurse bees. I wonder if decreasing number of nurse bees with a failing queen are giving misguided queue to the foragers. Maybe older nurses are not producing a well balance royal jelly? Maybe if they have not brood to take care of, they willingly retrieve pollen from foragers.

  • I have seen this quite a bit in the past 2-3 years in San Francisco where we have something blooming late Dec-late Oct. However, the pollen plugged frames are usually in the bottom 2 boxes of the hive. The bees seem to keep this pollen in reserve below the brood nest while still storing excess honey overhead (and some in these pollen-plugged frames as well), leaving little room for brood rearing which takes place primarily higher up. Interestingly, some of these pollen-plugged frames get emptied out from time-to-time, primarily from the middle frames.
    I use 1 deep with all additional boxes being mediums for all colonies and no queen excluder. I recently resumed use of slatted racks to see if this might change the bees’ use of frames in these bottom boxes.

  • Like most beekeepers, I love watching the entrances to my hives. They’ve been bringing in tons of pollen (we finally had some fair weather for the bees after a brutally cold and windy winter). However, I don’t assume, as other beekeepers do, that the pollen means there is brood. I’ve read a lot and watched many documentaries, I haven’t learned that the presence of brood stimulates pollen collection. If there is a reference for this, I would gladly read it.
    I say this because when a kindly beekeeper was making a nuc for me as a gift (my first bees!), the former beekeeper who kept the nuc on her property because of known DCAs said all looked well because they were bringing in pollen. She assumed there must be brood. She never checked and the beekeeper who made the nuc didn’t check. Actually, he’d never been able to see eggs so making nucs was always a gamble for him–if I had only known! When we brought the nuc to my house, the minute we opened it, I know it was queenless. There were maybe a few hundred bees, if that. But they had pollen and they had nectar.
    I think many beekeepers forget the basics when facing a situation: bees collect pollen and nectar, it’s what they’re born to do. So faced with no brood to rear, even hopelessly queenless colonies will collect nectar and pollen. Sorry for the long comment, but I tell this to every new beekeeper who tells me everything looks good because they’re bringing in pollen. Never assume.

  • Also. Last year they filled every spot with nectar and that left little space for the queen to lay. Why does this happen to my two hives?

  • Rusty,

    Pollen bound frames happens here. These are from our region being nectar poor but pollen rich and foragers won’t normally come home empty, and why our summer dearth becomes a propolis bonanza!!! I take these pollen bound frames and move them up into the honey chamber for topping off then in fall move those frames into the the summer splits. This is what I call rocket fuel for the overwintering nucs…come spring this bee bread gives warming colonies the fuel they need to rear big populations early, course it keeps me on my toes to make sure they have enough honey to not starve in late February and all of March.

  • Hello,

    So, this is happening in my hive! It lost it’s queen sometime in autumn, the bees raised an emergency queen. She was successful until late winter maybe even too successful because they prepared to swarm and did…twice!

    The inspection of the hive after the 2 swarms left was a bucket of cold water. I didn’t think about what to expect and I didn’t expect frames and frames of no egg or larvae whatsoever and only a few drone capped cells and 2 queen cells still unopened.

    For the next couple of weeks the still large worker population has been collecting lots and lots of pollen and storing it all over the frames. But on today’s inspection I did find larvae and – my first time – I saw the queen! (that was exciting!) She is beautiful, very dark and hairless, very long abdomen. I confess she doesn’t look very young to me, as her abdomen looked so smooth and dark, not hairy as I assumed it would be if she was young. But I can’t see how she could be older that a 2 to 3 weeks, when the swarms left the colony.

    I assume the extra pollen will now start to be consumed and the frames liberated? Or would you advise me to substitute a couple of frames heavy with stored pollen with new clean frames?

    Thanks, you seem to post things that are happening to my bees all the time, it’s great.

    All the best,

  • Well, thanks again, Rusty!

    In February I realized one hive had a problem with varroa mites, so I decided to use the sugar dusting at this point in the season (So Cal, good nectar flow) to keep their numbers down. As a result, I’ve been checking and dusting weekly. Yesterday I found more pollen than I had expected (much more!). As a result of your post I looked a little closer and I seem to have a queen issue (not much new brood, new queen cells). So I’ll requeen soon (2 weeks) and hopefully that hive will be stable and happily productive.

    Thanks again, both to you and to Randy Oliver (my two choices for late night reading).

  • Rusty, you mentioned that you were going to remove pollen, but it was too late. So please tell me, how do you remove the pollen? I’m a 3 yr newbee!

    • Donna,

      I fear I mislead you. I only meant that I would take some frames of pollen out of the hive and store them (in the freezer). How to get the pollen out of the little holes? I have no clue.

  • My hive is healthy and well, just swarmed two months ago, is now requeened and has pollen, capped brood, and honey is only one deep though. Just wondering if this all sounds go to you.

  • I have a question that hopefully someone can answer… The last few years i’ve been noticing something weird with the i guess native honey bees in my area… They are colleting pollen and storing it outside this hive in some akward places… This year, there is a bee putting pollen in the screw hole of a space heater in my garage. They usually fill it about half an inch to an inch full then cap it with a sand mud mixture… Just seems weird didn’t know if it is a common thing or if i have something special here…

    • Parks,

      They are not honey bees. They are some kind of solitary cavity nesting bee, perhaps mason bees or leafcutters. What you describe is exactly what they do. Here is a photo of mason bee housing that you can build.

  • I realize this is an oldish thread, but it’s about pollen so here goes. Western Washington growing seasons for crops is politely put “compressed” notably crops that like warm weather. I am seriously considering planting a bit over 7000 sq feet of heirloom sweet corn for us, our neighbors and some of our co-workers. Most reasonable time of year to plant is early June to avoid rains rotting the seeds with harvest 75-90 days give or take. This puts massive amounts of essentially just pollen only ready for the bees to feast on tail end of July/early August with very few nectar plants available where we live or in the surrounding environments. Should this be a concern when it comes to the whole yes there can be too much pollen going into winter? We are also planting for the first time about as much goldenrod as corn and about as much late flowering sunflowers if that helps flush the picture a bit. Very little exists in the way of neighboring flowering beds of any kind, though lots of fruited blackberries hanging on the vines this time of year. Thoughts appreciated.

    • Gary,

      I don’t think excess pollen-collecting has anything to do with how much pollen is in the environment. It has to do with something being amiss in a particular colony. Plant whatever you want.

  • I am doing a search now to see if anyone has figured out what to do with the excess pollen. This is a problem in my area: SW Ohio. The former state entomologist who keeps commercial numbers of hives has told me it’s a problem for him as well, so apparently it is just a thing here. It’s a big waste of good drawn comb, because the bees never need that much again – there’s always a new supply each season.

    Ideally, I’d find a beekeeper who makes lots of new hives to take some frames of pollen from me, and trade me for drawn comb, but the concern they have is disease transmission. So my quest is to find out if any genius has discovered how to remove the beebread from the cells so the comb can be reused.

    • Karen,

      Once the pollen gets dry and shrivels, you can just knock a frame against a hard surface and pollen pellets will pop out.

  • Pollen hoarding is highly inheritable. Bees can easily be selected to specialize in pollen collection. Bees that forage for pollen are superior pollinators of almond trees. Almond pollination requires about 75% of the nation’s commercial beehives. Best if the nation’s bees specialize in pollen.

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