How to Find Monarch Eggs and Caterpillars (2024)

A female Monarch butterfly deposits an egg onto the underside of a swamp milkweed leaf. A female monarch can lay 300-500 eggs over the span of two-five weeks. Photo by Sid Mosdell. https://www.flickr.com/photos/sidm/4813477518/in/photostream/

Monarch butterfly egg on a milkweed leaf just before hatching. Photo by Laurie Shaull. https://www.flickr.com/photos/number7cloud/29844659267/

Jeweler's loupes are a wonderful way to get a closer look at monarch eggs and caterpillars. Photo by Rebecca Chandler.

A milkweed leaf that has been chewed on. Photo by Rebecca Chandler.

Monarch frass on a swamp milkweed plant. Photo by Rebecca Chandler.

Can you tell me - is it possible that Monarch butterfly's may lay unfertilized eggs - and is an egg that turns black a dead egg?
Thank you

I had wondered this too. I was watching a monarch and it appeared it lay an egg on a bit of holly near the milkweed. Checking it over some days later there were 3 black dots that seemed to resemble a monarch egg, but totally round, firm and slightly smaller. I’ve found these on several underside milkweed leaves too. I couldn’t determine if they were eggs of another insect, odd frass, unfertilized eggs? But they were firm. Google hasn’t been a help.

Monarch eggs turn blackish hours before they hatch, this is normal

Are you sure it was a Monarch as Monarch's only lay eggs on milkweed. there are about 3 other butterfly's with similar color and a couple with similar markings.
https://www.butterfliesathome.com/monarch-butterfly-look-alikes.htm#:~:text=Butterfly%20Look-Alikes%3A%20Monarch%2C%20Queen%2C%20Soldier%20and%20Viceroy%20Most,It%20has%20orange-brown%20wings%20with%20dark%20black%20veins.

I have a monarch laying eggs on my passionflower

hello 👋 i was wondering if you know if its to late to plant milkweed? i havent been able to find any caterpillars yet

I randomly scattered in the air about 50 swamp milkweed seeds on the side of a half mile long drainage ditch about three years ago. The ditch has developed now into an entire field of Milkweed plants. Nearly a thousand plants this year. This year I saw up to 25 Monarch's per day swirling around each other. I've just researched where they lay their eggs and how long it takes the larvae to emerge. and am now looking for evidence the larvae are eating. I also scattered thistle weed seeds and from which there are several areas that the Monarach's are visiting. All in all, things seem to be improving.

nope its completely normal. they are about to hatch congratulations!

We have been looking for eggs over the past few weeks. While we had much success in finding eggs and caterpillars we have yet to find a chrysalis. How far away from the milkweed have they been known to travel in order to make a chrysalis? I also wonder, is there a specific plant they look for to pupate? So far we have counted thousands of eggs and hundreds of caterpillars but no pupas.

Last year a caterpillar crawled through the garden, up the porch steps, half-way across the porch, and chose an old chandelier that was on the floor, to hang from. I was able to check the progress every day of the chrysalis, which was a breath-taking green and gold jewel like I have never seen. This was the first time I have ever experienced Monarchs up close, and I will spend the rest of my life providing for them. I wish I was able to submit a photo so you can see what I just tried my best to describe.

I planted some milkweed this year and I got my first monarch not long after. I have pics of the chrysalis, which was hanging from the siding right at the milkweed garden. It was a beautiful sight. When the butterfly emerged it was awesome. We have decided to do our part to save the monarchs with our milkweed garden.

I would like to help save monarchs. I'm researching them but know so little about them.

Mine have attached to the underside of my hydrangea beside my milkweed, and to the house siding mostly but they have travelled over to my neighbors house as well.

thats so cool!

They could crawl upto 5 feet away to form a crysalis

We found one 30’ from the closest milkweed before. We have tripled our milkweed and added several butterfly bushes and hydrangeas. Hoping to keep them from having to travel so far.
We have not had success in getting 1st generation eggs, even though we live in south MS. We typically get 3rd generation eggs and larvae.
When 1st and 2nd gen’s are making their way south.

We have an orange flowering plant that comes back each year and we have monarch caterpillars every year. This year we had 12 on the plants at one time. Today we have 2 chrysalis on our porch, about 10-15 ft from the plants. Not sure where the others went.

The orange-flowering plant is probably butterfly weed, as monarchs only host on milkweed plants.

I have lots and lots of milkweed but have never seen a caterpillar or chrysalis. I do see butterflies in the garden. What's going on?

Aw. That must make you sad. I dk why, but don’t give up! There are Monarchs where you live?

My milkweed plants are 3years old and get huge - I have seen many monarchs on them but never eggs - any ideas?

will small caterpillars survive if I put them in a large jar with fresh milkweed daily ????????????

Yes! I wrap the tiny stem of the milkweed leaves in a piece of slightly moist (not dripping) paper towel and keep the cats in lidded containers. Clean the poop out twice a day and replace the leaves when needed.

I've had some some Monarch's laying eggs this week and I noticed that my milkweed plant has a large amount of aphids on it. Will they harm the eggs or larvae?

The aphids happen every year on all my plants. I Still have eggs and caterpillars on them. Last year I collected 125 eggs and released 121 butterflies. 4 caterpillars died young. As far as the aphids harming the eggs or young, I don't know. I do NOT see evidence of much chewing on many of my plants from caterpillars, but I have found several chrysalis hanging around my yard, so some have made it on their own. I do know that ants on the plants will take eggs and small caterpillars. I've seen it happen.

Wow! Good job, Dave! That’s impressive.
Good to know about the ants…& I thought it was just birds.

Them no good pests!!

I have a pesky little lizard hanging around my milkweed garden.

This is my first time raising Monarch butterflies I am having an amazing experience, I found the caterpillars in my milk weed plants. In a week I have released 18 butterflies and I have 2 to go. I live in Mechanicsville VA, I would like to know when I can plant the seeds that I am ordering to have mature plants in Springtime.

I have just started to raise Monarchs and have quite a few caterpillars on my milkweed. I am raising them in a mesh cage but I seem to be having a problem. One caterpillar grew to a mature size and then hung at the top of the cage. However, the caterpillar only made half of the chrysalis and then appears to have died. Another grew to a great size then died before making the chrysalis. I now have another that has reached the stage where it has found it's way to the top of the mesh cage and I'm not sure if it will survive. Is it possible there is some type of virus in the cage that is killing them?

I had this and then the fly larvae came out of it
Do u see sting like hanging from them?
Goggle flys killing my monarch

Be sure to keep your enclosure clean, caterpillars can be very susceptible to viruses. Clean the East frequently (internet has suggested cleaning solutions), make sure there is good ventilation, etc.

I have released about only five or six monarch that appeared very healthy and beautiful. I recently bought some new milkweed and monarchs laid eggs, I'm so upset my cats are turning black, I had one form chrysalis and he's black and he's not emerging I fear I have the dreaded black death and I'm devastated. Should I throw my milkweed away after this is all done? I'm considering treating it these were tall milkweeds and they had the buds on them and I think I bought them from home Depot with the OE bacteria I'm very upset!

I am having the same issue. All of my beautiful caterpillars made their Chrysalis and I can see the formed butterfly inside but they will not hatch. My heart is breaking as I took such care of them. Is there really such a thing as "black death". I've not heard of that. Is it the same as OS?

There sure is. Had it happen to one of my chrysalis. I'd have to search for the reason it happens again because it's been a few years and only happened once do I can't recall off the top of my head.

The milkweed sold at Home Depot is almost certainly tropical or Mexican milkweed, which tends to carry lots of spores of the OE parasite. The parasite usually often makes the monarch unable to hatch out of the chrysalis. You should look for milkweed that is native to your area, and you should not plant the tropical milkweed anywhere in the U.S.

Thank you for the well detailed information. It's really helpful tips on how to get rid of them. Keep sharing. :)

Such a lovely blog page!

I have numerous cats eating native milkweed this week in Wisconsin.

I'm in East Central Wisconsin, and currently have over 50 cats in various stages from eggs to chrysalis, and have released many butterflies already. It does seem as if they were late getting to Wisconsin this year, as I didn't find any eggs until June. Usually I find them in May. The weather here was weird this spring, and we had quite a few cold nights late.

thats so cool i wish i had alot of butterflies like you :]

I live in WI as well. I just cut down 3 milkweed on accident. I live on a horse farm so I have lots in the paddock. I also live by the woods so I have more there as well.

We have our milkweed plant in a pot on our patio table and just noticed our first caterpillars yesterday. Will the caterpillars be ok getting off the table to find somewhere to pupate or should we move the plant closer to the ground to make it easier for them?

Thank you all for great comments and replies.
Very informative comments. Blessings to you all.
As well as for our monarch butterflies.🦋🙏🏻✝️🙏🏻🦋
Thank you! Miss Rebecca Chandler..

Take the whole piece of the branch, not just the leaf.
And add fresh plant as needed. Falling asleep, but search online & you’ll find instructions. Best!

that sounds like a good idea

Knowing that Monarchs in the wild are “challenged” these days, is the whole idea of this page to encourage finding the eggs and caterpillars, and then moving them to a protected environment to mature? We have significant amounts of volunteer milkweed on or property (first appearing about five years ago) here in Colorado. I saw my first M caterpillar on one of the plants a couple of days ago. I went to find it to show my girls yesterday but could not find it again. Should I have moved it to a safe enclosure for awhile?

Every morning I see more new holes in my milkweed and can find a few small (1st - 3rd instar) caterpillars but then the cats seem to disappear. I have taken 4 eggs inside that were oviposited around the same time and 3 are at 5th instar. The fourth one made a chrysalis this morning. Is it possible that all my outdoor cats are being eaten by predators? I thought once they reached 3rd instar they should be pretty safe?

I read that ants do not like coffee grounds or vinegar. I sprinkled coffee grounds around the plants and that seemed to help. I spritzed some diluted vinegar in the soil in another area. My soil is rather alkaline, so I did not worry about acidifying my soil too much.

Thank you for this blog. Very informative ! I am new about raisin monarch butterflies. I havex2 chrysalyns. I am very excited. I found 5 eggs on my milkweed plant this morning.

Hi, very good blog; thanks to all who are participating and informing us newbies. I live in suburban Baltimore and have 5 volunteer milkweed. that come back each year. They sprouted in late May, then grew to about 7 feet tall.by end of July. They have a lot of pods. We had a bad wind storm yesterday and they were too top-heavy and fell down. Question is, when do the adult monarchs lay their eggs, and when is the plant done being useful to then (i.e. when can I safely cut the plants down? Thanks to anyone who answers.

I cut off 3 stalks of milkweed with caterpillars and eggs Unfortunately, there is also aphids and ladybugs. Is it okay to put them in a butterfly container with the aphids?

I raised monarchs for past five years. Last year I tried in my new home in Tehachapi mountains. They all turned black and piled on each other and died. Soooo sad. This year, I planted a robust butterfly garden. Today I am watching as a mature monarchist cruising around the flowering milkweed. Should Ibring them inside if I find any eggs, or just let nature take its course. I’m in Southern California. Tx, ya’ll.

Pretty sure I've discovered Monarch eggs, but not sure, as they're on my tomato plant, not milkweed. I was trying to find out what these tiny singular eggs were on my leaves; I shared a photo through Google Image Search, and they looked like and were identified as Monarch eggs. I can share my pic if necessary...

I agree, for 3-8 days, a monarch butterfly is an egg. It must first consume the eggshell before it can begin feeding on the leaf, which is how it will hatch. Depending on the size of the plant, one caterpillar may completely defoliate an entire milkweed.

I have a few Monarch caterpillars on my milkweed plant but they have gone through it quite quickly, do they eat anything else or can I feed them something to keep them well nourished?

Live in Hawaii- no milkweed. So I purchased a “Crown Plant”
3 ft tall plant. There’s a caterpillar on it .. now what? I’d like to
The monarch’s to thrive what’s next?

There is local nursery on the Hilo side of the Big Island supplying butterfly bushes (milkweed) to Home Depot. I now have 20 plants in my garden and lots of caterpillars in various sizes. I also have Lantana flowers along side of the milkweed. Monarchs are dancing around all day.
I bought three more milkweed plants today, caterpillars included! That tickles me as I’m now able to add to the Monarch gene pool in my area.

Found my first two caterpillars two days ago. Got a plastic container with water in it and milkweed leaf stems stuck through a hole in the lid. Have it in a small metal waste can with a piece of woman’s hosiery stretched over the top and a rubber band stretched around it. Got a Restcloud Butterfly Habitat Ordered that’s supposed to be here Sunday.

Are they monarch eggs? I've seen them but I don't have any idea what it is called.

Just wanted to note that the egg pictured in the third photo and captioned as being close to hatching actually appears to be parasitized by tiny wasps. When a viable egg is close to hatching, only the tip darkens (which is the head of the caterpillar). All the little dark spots in the pictured egg are developing wasps…..

I'm surprised by all of the comments about monarch chrysalises found away from the milkweed plant on which the caterpillars are found. I have a single milkweed plant in a pot. All of the chrysalises I've found were attached to the same plant, never anywhere else. Not on other plants or structures. 🤔

I live in south western Ontario. What time is best to look for Monach eggs.

i'm up in Sudbury Ontario and i found my first tiny little caterpillars on july 7th,they were about half an inch long..now a week later,they are huge! the biggest one,about 3 inches long decided to leave already.i have 3 left. l had 2 milkweed plants,which definitely wasnt enough,they eat alot! i bought 4 more plants today.i think 2 of cats will leave in the next couple of days and the smaller one by the end of the week.it happens fast!

I found 30 baby monarch caterpillars on my dill plant this morning 07/30/23. There is no milkweed nearby that I know of and have heard of similar marked caterpillars. If not monarchs what would they be?

Black Swallowtail butterflies host plant of choice is parsley. Their caterpillars also eat dill, fennel, and Queen Anne’s Lace.

I have several monarch caterpillars and it is mid-august, will they still turn to butterflies.

I had about 20 of them just this week - did not even know they were there until they were pretty large. My milkweed has been completely stipped in some places - they feasted! But now they have almost all disappeared. I'm assuming they are crawling off somewhere to build a chrysalis? Really hoping to see one open...

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Finding monarch eggs and caterpillars can be an exciting and rewarding experience for those interested in observing and supporting these beautiful butterflies. Here are some tips on how to find monarch eggs and caterpillars:
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