Monarch Butterfly Eggs: What They Look Like & More

Written by Emily Wolfel
Updated: January 23, 2023
© Sari ONeal/
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Key Points

  • Monarch butterfly eggs are small, white or off-white, and oval-shaped, with vertical ridges on their surface.
  • Since monarch caterpillars eat milkweed, the butterflies lay their eggs on the leaves, stems, or main stalk of the plant so the caterpillar has access to food when it hatches.
  • Monarch butterflies lay their eggs in the spring or summer, with a single butterfly able to lay up to 700 eggs in a season.
  • The eggs have a short incubation period of 3-5 days and will turn black shortly before they hatch.

It’s hard to overlook the brilliant orange and black wings of a monarch butterfly as it moves through a garden of flowers. It’s also hard to believe that the life cycle of this incredibly colorful butterfly starts with a tiny egg. Continue reading to learn what monarch butterfly eggs look like, where they are laid, when they hatch, and more!

What Do Monarch Butterfly Eggs Look Like?

One way to identify the eggs is by their color. This butterfly’s eggs are off-white or white. They have an oval shape and are about one millimeter in size. A close inspection of a monarch butterfly egg reveals vertical ridges running over its surface.

Their small size means you have to be looking carefully for these eggs on milkweed plants. They are normally found on the underside of leaves. This gives them some protection from passing birds and other predators.

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Monarch butterfly eggs are white or off-white.


Monarch Butterfly Eggs vs Aphids

Some people confuse aphids with monarch butterfly eggs. Why? Because they both are found on milkweed plants. In terms of size, both monarch butterfly eggs and aphids are about the same length. However, some basic differences between them can help with identification.

One of the most fundamental differences is found in their appearance. Aphids are brilliant yellow in color whereas monarch butterfly eggs are off-white or white.

Aphids gather in large clusters right next to one another. There may be dozens of aphids in one cluster. Alternatively, monarch butterflies lay just a single egg on the underside of a leaf or a stem. As a note, some types of butterflies lay clusters of eggs.

The larva inside a monarch butterfly egg doesn’t move around. However, it can take on a darker color as it nears hatching time. Alternatively, you’ll notice an aphid has six black legs. So, if you see something moving around on legs, you know it’s not a monarch butterfly egg!

Where Are They Found?

Monarch butterflies lay their eggs on milkweed plants. They can be found on the undersides of leaves, stems, and even on the plant’s main stalk. These beautiful butterflies have a reason for laying their eggs on milkweed plants. When the larva, or monarch caterpillar, emerges from its egg, it starts to eat the milkweed plant right away. Milkweed plants provide nourishment to a monarch caterpillar so it can prepare for the pupal stage.

How Long Do They Incubate?

Monarch butterflies have a short incubation period of 3-5 days before they hatch. In fact, their time in the egg is the shortest stage in their entire life-cycle, with the resulting larva stage lasting 2-3 weeks after the egg hatches, the pupal (chrysalis) stage lasting 5-15 days, and the butterfly (reproductive) stage lasting 2-5 weeks in the first generation and several months in the second generation.

What Does it Look Like When a Monarch Butterfly Lays Eggs?

Monarch butterfly eggs are laid in the spring and summer seasons. The process starts when a female butterfly lands on the leaf of a milkweed plant. She curves her abdomen toward the underside of the leaf and releases the egg onto the leaf’s surface. The egg is covered in a sticky substance, so it adheres to the leaf. A female flies from leaf to leaf laying a single egg on each one. One female monarch butterfly can lay as many as 700 eggs!

A female monarch butterfly can lay up to 700 eggs at a time.

©Sari ONeal/

Can You See the Eggs?

Yes. Even though they are very tiny in size, it’s possible to see them. One advantage of butterfly enthusiasts is we know what type of plant to examine for monarch butterfly eggs. A magnifying glass is an excellent tool if you want to take a close look at the appearance of a butterfly egg.

How Do You Identify Butterfly Eggs?

Not surprisingly, the appearance of butterfly eggs differs amongst the various types of butterflies. While monarch butterfly eggs are off-white and oval-shaped, the eggs of a Brimstone butterfly are pale green with a pointed end. Furthermore, the eggs of a small copper butterfly are white/gray in color with a surface resembling a golf ball.

How Do You Know When a Butterfly Egg Will Hatch?

Different types of butterfly eggs hatch at different times. As an example, the small copper butterfly’s eggs hatch in one to two weeks. The speckled wood butterfly’s eggs can hatch anywhere from one to three weeks.

Closely examining the appearance of a butterfly egg can help you determine what type of butterfly it is. Once you’ve determined what type of butterfly laid the egg, you can study the facts of its life cycle to learn when it will hatch.

Do All Butterfly Eggs Hatch?

No. Butterfly eggs are vulnerable to birds, lizards, amphibians, and other animals that can eat them. Though monarch butterfly eggs are small and hidden on the undersides of leaves, they are still at risk of being eaten.

Pesticides used in a garden may kill the larva inside butterfly eggs before they get the chance to hatch.

Do Butterflies Stay with Their Eggs?

No. Female butterflies lay a lot of eggs throughout a gathering of milkweed plants. After attaching one egg to a leaf or stem, the female moves on to look for the next place to lay an egg. The larva inside the egg must develop and hatch on its own.

Do Monarch Butterfly Eggs Turn Black?

Well, sort of. The egg itself remains the same color. However, about 2-3 days before the egg hatches, the larva inside starts to develop its pigmentation. This can be seen through the translucent shell of the egg, making the top of it appear black or dark gray.

What Eats Monarch Butterfly Eggs?

Birds land on milkweed plants to eat the eggs. The black-headed grosbeak is a well-known predator of these eggs. Toads and lizards also eat monarch butterfly eggs.

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monarch butterfly egg on leaf
A female monarch butterfly can lay up to 700 eggs at a time.
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About the Author

Emily is an editor and content marketing specialist of five years. She grew up in rural Pennsylvania where you can regularly encounter anything from elk to black bears to river otters. Over the years, she raised livestock animals, small animals, dogs, cats, and birds, which is where she learned most of what she knows about various animals and what allowed her to work as a dog groomer and manager of a specialty pet store. She now has three rescue cats and two high-needs Pomeranian mixes to take up her love and attention.

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