When do Monarchs Arrive in Connecticut? (and start laying eggs!)

Monarch butterflies are incredibly unique!

when do monarchs arrive

Instead of overwintering in Connecticut like every other insect, Monarchs MIGRATE back to Connecticut every summer.

Yes, you read that right. Monarchs act more like birds! Every fall, they migrate south to Mexico, and then each summer, these butterflies come back north to Connecticut to reproduce and lay eggs.

So when exactly can you expect Monarchs to arrive in Connecticut?

As you can imagine, there is not an exact day that all the Monarchs get together and decide to start migrating back to Connecticut. Each year, the actual time changes depending on the temperature and availability of nectar sources. It also matters where you live in Connecticut, as the southern areas will see Monarchs slightly before the northern parts.

But with that being said;

Most Monarchs get to Connecticut in mid to late June.

And just so you know, the butterflies that first arrive are NOT the same insects that left the previous fall. The first Monarchs you see each summer are the GRANDCHILDREN of the individuals that left last year.

*On a side note, the migration of Monarchs is incredibly fascinating. It takes four generations of butterflies to make the complete annual journey. All the details are outside the scope of this article, but I encourage you to educate yourself because it will blow your mind!

Anyways, once the Monarchs get to Connecticut, they immediately start laying eggs to produce the next generations. These individuals will eventually be the butterflies that fly back to Mexico.

Luckily, we can all help Monarchs!

Making sure your yard is FULL of native plants is one of the best things you can do. Try to pick flowers with different bloom times, so you always have fresh blossoms full of nectar from when they first arrive in June to when they leave in the fall.

In addition, try reading this article, which is full of tips that will make your yard more friendly to butterflies, including Monarchs:

When do you usually see the FIRST Monarchs in Connecticut?

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  1. I saw my first monarch today Oct 4th! I have bright pink butterfly bushes and it spent all day going from bush to bush. 

  2. We, here in Southington, CT are not seeing Monarchs as we did in past years. What is happening? My friends and neighbors have large amounts of milkweed, but most plants lack eggs. Please advise. Thank you! Steve

  3. My northern New Haven County garden has been full of orange milkweed for years, but I don’t recall ever seeing a monarch. Does asclepia tuberosa attract them?