How To Raise Mealworms

Everyone who has a small flock of chickens should raise mealworms, not because chickens need them, but because they love them.
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  1. Gallo del Cielo
    How to raise mealworms (Tenebrio molitor)

    Everyone who has a small flock of chickens should raise mealworms, not because they need them, but because they love them. It's very easy to do and once set up they are virtually maintenance-free and very inexpensive. I give my girls a hand-full or so a day; they think fresh mealworms are the best treat in the world.

    1. You need a container; I prefer 10 gallon aquaria. They allow you to see the condition of the substrate and the glass keeps them from climbing out. You can also use a plastic tub. Keep in mind that it is better to have greater surface area than depth. Never cover it with anything that restricts airflow, especially if you live in a humid environment; but a wire cover is good to keep the lizards, geckos and mice from eating everything if you keep it outside.

    2. Add about 3" of wheat bran to the bottom of the container. I get mine at grocery stores that sell food in bulk bins, but you can also get it at feed stores. You should get it for $1/lb or less (buy about 4-5 lbs to start). You can also use chicken feed, provided it does not have diatomaceous earth (DE) added. I would highly recommend freezing any grain product for a couple of weeks or heating it to 130 degrees for 15 minutes prior to adding it to your colony to limit unwanted pests.

    3. Add some mealworms, the more the better and the faster the start-up will be. I recommend starting with at least 1000 for a container the size of a 10 gal. aquarium.

    4. Add some vegetable matter. I use potatoes, carrots, apple peals, celery stumps, watermelon rinds, whatever kinds of scraps are available. Feed them as often as you'd like. The more you feed them, the more they multiply. Strive to provide consistent access to vegetables for the best productivity. You don't want it to ever get wet inside, the wheat bran must remain dry. Most colony failures are a consequence of excess moisture, which can spark outbreaks of fungus and mites. I live in one of the driest places in the world and I never add moisture beyond that contained within vegetable matter--and I also avoid adding high water content vegetables. The more varied the diet, the better the worms are as food. Be observant when adding new foods and immediately remove anything that they won't eat to avoid rot.

    5. Keep your colony in the shade, outside heat (even in Arizona) is great for them but direct sun or rain will kill them. The warmer they are kept, the faster they develop. They must be brought inside for the winter as their development will slow considerably and they will die in a freeze.

    6. When the wheat bran particles start looking smaller and the layer gets thinner, add more (just dump it over everything). I add more a few times a year. I only clean up the dried vegetable matter that builds up, more rarely the bran.

    7. Wait a couple months after setting up your colony before you begin using worms for food. Use only the larvae (worms) to feed your birds. The pupae and beetles should be left alone for reproductive purposes. There is no need to remove dead animals, old carcasses will be consumed by successive generations. You can collect worms when you add new food. For example, cut a potato in half, put the cut side down and wait 10 min. or so. The larvae will grip on with their mouths and you just lift them up and shake them into a container. Remember, they are harmless and don't bite.

    8. Some people separate beetles, pupae and larvae--I don't, mostly because production is fine for me without the extra effort. If you provide adequate resources for the colony, cannibalism is very low. However, separating them is a good way to observe development--which is very interesting.

    9. Because reproductive and developmental rates are higher with greater temperatures you'll often have more worms in the summer than winter. You can extend the summer glut of worms by packing them in fresh bran and storing them in the refrigerator for later use.



    With prolonged or frequent exposure to mealworms, some individuals will develop severe allergies to them. I highly recommend wearing a mask while tending to your colony and be observant of any respiratory changes you might experience while working with it. A word of caution:


    This colony has been in continuous operation for several decades; I have been caring for it since 1987.

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  1. bajabirdbrain
    Started my mealworm farming back in Jan in anticipation of getting my chicks in March. Only problem is the worms started turning into beetles before the chicks could eat them!!! Since then I placed another order of worms and have had good success in raising them. My 2 problems is that I tend to get too many worms of one size and have to feed them in large quantities to "use " them up before turning back into pupa/beetles. Now I am running out of beetles that I need to lay eggs! I should be getting beetles soon, but I am concerned about the glut of worms that is coming. Is it really practical to put worms in 40+/- degree fridge to slow down the worms growth? I have had zero problems using sliced potatoes for food and sliced apples. I add feed twice per week and remove any old food. When the wheat bran starts getting powdery I sift it out and replace with fresh wheat bran. So far, so good. Bajabirdbrain
  2. Ulaidian
    Just a heads up (and this might have been mentioned), but don't use potatoes. When they rot, there're toxic and will kill off your food.
    Like above, moisture is your enemy. I usually throw a segment of orange now and again.
  3. BigMikeW
    I would really like to raise mealworms for my future chickens. Since I don't have any experience with any other types of feeding yet, it would be difficult to know how economical it is by comparison. Does anybody do this currently that could share?
  4. ruchickn
    I tried just didn't have the stomach for it. I bought some dried ones , if you don't just give them as a treat they want eat their regular food.
      djcap likes this.
  5. den talarek
    i will be starting to make a similar setup asap, ithink i will have to go bigger as i have 65 birds but the protien should be worth the effort. thanks for info. den [poland]
      djcap likes this.
  6. jlisonbee
    Great post about starting a mealworm farm! I have all the supplies to start mine asap, but as I was about to purchase the worms from a local pet food store someone mentioned that I should be careful where I buy the live worms from as these worms could carry harmful germs and diseases that could be passed on to the chickens who eat them. Has anyone also worried about this? Where is a good place to buy live worms? Any suggestions would be great! Thank you!
      djcap likes this.
    1. DotsMama64
      We have had mealworms for as long as I can remember. My Mother has raised them and now I raise them as well. We also raise the super worms.

      I suppose it could be that " these worms could carry harmful germs and diseases that could be passed on to the chickens who eat them. " Personally, I have never heard this myself.

      Keep their food dry and use cottonballs in a lid for their water and they will do fine.
  7. Katie Scarlett
    Where do u get the works to start the colony
  8. Katie Scarlett
    Where do u get the works to start the colomy
  9. mskluck
    Could I use rasin bran?
  10. Ronnie2
    What temperature is best suited for raising mealworms?
      djcap likes this.
  11. Gail Laubenthal
    I love this article. As a retired PreK teacher, I can relate to raising them so that children can experience the life cycle. I will begin my colony this week. I never thought of raising them at home for my chickens.
      djcap likes this.
    1. SuziQ18
      Very helpful! Can wait to get mine started!!
  12. mskluck
    Thanks for the DIY info
  13. sue5050
    I just purchased a 2 lb container of dried meal worms to start training my guineas to come home. it is really expensive this way but not sure if I can get over my feelings about live ones
  14. mskluck
  15. gagirl02
    I have some black worms in my container. Are these dead worms? If so, can I feed them to my chickens?
  16. 4paws
    I've been itching to start raising these for a while, and I would love to do it outside or my screened porch, BUT, I'm in Florida and am concerned that the summer humidity would be a problem. Thoughts, please?
    I like that you do it in one container rather than dividing them as I've seen most do.
      djcap likes this.
  17. YborChix
    We do ours with oatmeal and some chick feed. Originally we followed instructions that say they need moisture from fruits or veggies but even a somewhat dry piece of carrot almost always started mold in the oats and the mold is your enemy. Perhaps for us it is the Florida humidity. If you get it (mold) throw out the whole batch because it's not savable. We use 1 gallon ice cream containers and fill the lids with safety pin size holes.This keeps other small bugs from getting in. Then we toss them in a dark spot and forget about them. Once we stopped worrying about giving them moisture, we had success. (hopefully a good tip for those of you in humid places) Please follow our Instagram and like our facebook.com/edenconservatory
  18. Big Cluck
    I had a high school science teacher that raise them in the class to feed to the other critters he kept. It really is as easy as the instructions above. My daughters and I started our colony today after our girls went through a 7 dollar bag of dried meal worms in under 2 weeks. It cost 13 dollars to get started as I had an empty 10gallon tank. 3 dollars for the wheat bran and 9.99 for 500 worms at the pet store. My kids had a great time getting it set up and keep asking to pet the worms! So excited to tell their daddy they had 500 new pets!! Does anyone know if placing them on a tray in the sun for an day or so would be an effective way to dry them out/preserve them for later use?
      eclecktic1 and mskluck like this.
  19. birdldy9
    What could I use instead of wheat bran?
      Thangbom and Awestruck like this.
    1. jak2002003
      Normal Porridge Oats from the supermarket. They smell nice too. That's all they need.. plus a few slices of carrot / potato / cucumber on top for moisture. I found cucumber the best.. as it has a nice smell. When I used other vegetables they smell bad if they get a bit moldy.
      djcap likes this.
  20. Wonderwend
    A thorough and informative guide - brilliant!! Thanks so much for posting :)
      djcap and mskluck like this.
  21. Gallo del Cielo
    @BoiseWiseguy , it sounds like you're doing everything right! What are you using for substrate? It always seems to take forever to see those first worms from the second generation. Under your conditions you should see very tiny worms about two months after the first beetles appeared. Take a handful of substrate and spread it out onto a sheet of paper and look closely to see if they are there.
  22. BoiseWiseguy
    Question - I've ordered 1000 worms, have them in an open topped container with a infrared heat lamp keeping them between 80-90 degrees. I've had them now for about 2 months. Recently I've seen a ton of beetles in the container, and no worms. The worms are for the most part gone. I'm putting in apple slices and lettuce, and replacing them when they get eaten or dried up. Am I doing anything wrong? Where are all the worms?
      djcap likes this.
  23. Gallo del Cielo
    @snowflake , Thanks! It is as easy or involved as you want to make it. Good luck!
  24. snowflake
    very nice thread, sure looks easy, and thank you for the allergy warning.:)
      djcap likes this.
  25. Gallo del Cielo
    @birdman55 Good luck from me too! I've been following your thread (beautiful birds), I also grew up in central MI.
  26. Lilorp14
    good luck birdman55
  27. birdman55
    going to start mine within the week...thanks for the tips
  28. Lilorp14
  29. Gallo del Cielo
    @Lilorp14 , Congratulations on starting your new adventure!
  30. Lilorp14
    just started my little farm!!!!!!
      djcap likes this.
  31. Gallo del Cielo
    @Farming Frenzy , Good luck to you, your silkies will love them!
  32. Gallo del Cielo
    @smoothmule , to my knowledge there aren't any vegetables that are toxic to the mealworms. There are lots of things they don't like (e.g. eggplant), but they usually avoid eating those things.
  33. Gallo del Cielo
    @Bean789 , I'm sorry that my response might be too late, I've not been receiving my notifications from this page. It's best to feed continuously, so sometimes this means smaller amounts fed more often. If your worms are dying, something besides over feeding is likely the cause (unless there were pesticides on the food). How is your colony doing now?
  34. Gallo del Cielo
    @thechxwhisperer , if you can keep them warm enough you could keep them outside. I'm not sure the energy expense of a heat lamp would be worth the increase in production though. You might consider a heating mat designed for putting under reptile tanks though. They are designed for this sort of application and would use much less electricity.

    @ChickyChickens , good luck!
  35. smoothmule
    Is there any food that is toxic to meal worms?
  36. Farming Frenzy
    Awesome :) Thanks so much.. this is really helpful, will be setting up a colony for my silkie flock. Thanks heaps!
  37. Bean789
    I started my batch with Super Food as supplied by the retailer who sold me the worms (2,000 if them). I added cornmeal and oatmeal as part of the substrate and then put in some sliced potatoes. A few days later, I added some carrots. A few days later, I added some lettuce. Now, almost 2 weeks later, after adding food every other day or so, most of my worms are dead. How often do I need to feed them? How much food can I add without mold issues? (no mold currently) How much moisture can they actually handle? (thinking this is the dead worm issue) What have I done wrong?
  38. ChickyChickens
    Im gonna start!!
  39. thechxwhisperer
    Can you use a heat lamp in the winter instead of bringing them inside?
  40. Gallo del Cielo
    @Cheryl1948 , Thanks! Yes, you can keep them inside. I don't think they stink, but my sensitive wife thinks they do. Really, I don't think they stink.
  41. Gallo del Cielo
    @Bean789 , Your set-up sounds good, look for bran when you can. They'll like whatever carrots you give them. There aren't really any vegetables that you can't give them, but there are some vegetables that they don't really like, e.g. eggplant. Experiment and watch and remove things they aren't interested in eating.
  42. Gallo del Cielo
    @XxMingirlxX , Thanks!

    @BoostPsi , 10K will be a great number to start with! Good luck!
  43. Gallo del Cielo
    @TeaChick , Thanks! I learned to grow these in the Deep South!
  44. Gallo del Cielo
    @Shuggiesmom , I don't think they stink, but my wife does. She's got a pretty sensitive sniffer though. Good luck with your sprouting!
  45. Gallo del Cielo
    @thechxwhisperer , Thanks!
  46. Cheryl1948
    Thank you for your article. I needed an EASY way to raise mealworms. If I start them now, October, can I keep them inside? Do they stink?
      Alan Boleware likes this.
  47. Bean789
    I found a local supplier of meal worms and got 2,000 for $14.00 plus a 'super food' 2.5 lbs for $4.50. I then took 2 bags of Publix cornrneal, not self rising, and 1 bag of Bob's Red Mill rolled oats, and mixed with the 'super food' to create a substrate of around 4 inches. I could not readily find the Wheat Bran nearby but will order some online for future replenishing. Dumped the worms inside, added potato halves, and have let them sit the last few days in a warm place. So far so good. Now, my question is.....on the carrots, can they have the little baby carrots or are the fresh carrots better for them? What CAN'T they have?
  48. BoostPsi
    for some reason there is no tab to view the end of this post & I have clicked "more" a ton of times but still haven't got away from replies from 2012.... anyway I wound up ordering 10,000 mealworms from the rainbowmealworms.net site. I was going to will call them but they are 40min away and shipping was only $9.85 or so... it cost $46.89 for 10,000 delivered... I will reply with results after they arrive. Luckily there is a buy in bulk store nearby so I can get wheat bran for about .69c/lb... the chickies will be happy
  49. Lilorp14
  50. Lilorp14
    i usually buy them dried from TSC but i think its a great

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