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Why Is It Called A “Worm Moon”?

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As the temperature begins to warm and the ground begins to thaw, earthworm casts appear, heralding the return of the robins. For this reason, the March full moon is often known as the Full Worm Moon.

Northern Native American tribes knew this moon as the Full Crow Moon when the cawing of crows signaled the end of winter. They also used Full Crust Moon because the snow cover became crusted from thawing by day and freezing at night.

The Dakota Sioux named it Moon When Eyes Are Sore From Bright Snow. The Full Sap Moon, marking the time of tapping maple trees, is a Colonial American variation. To the settlers, it was also known as the Lenten Moon. It was considered to be the last full moon of winter.

2019 Spring Equinox Full Worm Supermoon

In 2019, our March full Worm Moon occurs right after the start of spring—the vernal equinox arrives at 5:58 p.m. EDT, and the Worm Moon turns full at 9:43 p.m. EDT. That makes this the first full Moon of the new season. This is the closest coincidence of a full Moon with the spring equinox since March 2000—19 years ago (remember the 19-year Metonic Cycle?).  And it’s our final Supermoon of 2019, but it’s not our closest. That happened in February 2019.

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Is this month’s full Moon to blame for why Easter is so late in 2019? Find out.

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24 comments

1 SuperMoon 2019#3 - Jennifer Searls { 03.22.19 at 3:02 am }

[…] last full moon of winter is a worm moon! and this one was […]

2 Daniel James Lessley { 03.21.19 at 4:50 am }

Worm casts and robins?

3 Vernal Equinox & Worm Moon 2019 « Cosmic Observation { 03.20.19 at 11:43 pm }

[…] moon names: Moon When Eyes Are Sore From Bright Snow from the Dakota Sioux Lenten Moon from the Christian settlers Sugar Moon Last Full Moon of […]

4 WITNESS THE “SUPER WORM EQUINOX MOON” ON MARCH 21ST – Al Sadeem Astronomy { 03.20.19 at 3:44 pm }

[…] wondering why the last Supermoon is called a “Super Worm Equinox Moon.”Well, according to the Farmer’s Almanac, the full Moon in March is also known as the Full Worm Moon. The Native Americans began calling it […]

5 Do Supermoons Matter? Yes! Why You Required To See Tonight's 'Equinox Supermoon' For Its 'Moon Impression' - Science and Tech News { 03.20.19 at 2:02 pm }

[…] at the moon all that much, see the “Super Worm Equinox Moon” (March’s moon is in some cases called a “Worm Moon” since of the seasonal look of earthworms in The United States and Canada) appear on the eastern […]

6 See the First Spring Equinox Supermoon in 19 Years Tonight – Lifehacker | Everyday News Update { 03.20.19 at 1:49 pm }

[…] ground melting—and all the earthworms start moving around again. The Farmers’ Almanac shared this story about the […]

7 See the First Spring Equinox Supermoon in 19 Years Tonight - Lifehacker - eTrust News { 03.20.19 at 1:47 pm }

[…] melting—and all the earthworms start moving around again. The Farmers’ Almanac shared this story about the […]

8 See the First Spring Equinox Supermoon in 19 Years Tonight – CHEPA website { 03.20.19 at 1:14 pm }

[…] ground melting—and all the earthworms start moving around again. The Farmers’ Almanac shared this story about the […]

9 See the First Spring Equinox Supermoon in 19 Years Tonight | innovatorx { 03.20.19 at 1:07 pm }

[…] melting—and all the earthworms start moving around again. The Farmers’ Almanac shared this story about the […]

10 Methods to see final supermoon of 2019, the 'worm moon' - AZCentral - Latest News - lindaikejisblog.com { 03.18.19 at 9:40 am }

[…] seem. It is also recognized variously because the “Full Crow Moon,” in keeping with the Farmers’ Almanac, as a result of the cawing of crows means the top of winter, or the “Full Crust Moon” […]

11 Susan Higgins { 03.14.17 at 11:25 am }

Hi Cora McPhee, there is no relationship with this full Moon to deworming. It’s just the name of the Moon given by Native Americans due to springtime. We don’t offer a “best day” task for this.

12 Cora McPhee { 03.11.17 at 8:20 pm }

Enjoyed my first news letter would like to know if this moon is also for worming children or adults if not is it the new moon would like to know.

13 Summer-like conditions arrive this weekend, forecasters say | Weather Matters { 03.23.16 at 9:07 am }

[…] Moon — occurs today but will remain brightly lit over the next few days, according to the Farmers’ Almanac. It was called the Full Worm Moon because as the ground thawed over North America, earthworms would […]

14 RuRu { 03.23.16 at 7:30 am }

Go to the Best Days section of the Farmers Almanac and you can find the Best Days to plant seeds. You can also find the section you live in and the best days for planting in your area as well.

15 farmer john { 03.06.15 at 3:22 am }

If you want to know about the moon stay up late and go outside.

16 Full Moon | Gardening Whisperer { 03.05.15 at 9:30 pm }

[…] This Month’s “Tonight to be exact” is a Full Moon. It has several names and The Farmers Almanac has a great article on them. http://farmersalmanac.wpengine.com/astronomy/2013/03/26/march-full-worm-moon/ […]

17 Ellen Campbell { 03.05.15 at 12:24 pm }

I love the little obscure facts that you publish in this Farmers Almanac newsletter, such as the names of moons and other such interesting bits of knowledge.

18 Jodine Glover { 03.05.15 at 9:33 am }

I want to start planting flower seeds and plants. When would be the best time to start.

19 Rufus { 03.04.15 at 11:33 am }

Please consider turning Down the Music Volume. It Over Powers the Narration, which is the Reason for the Video.

20 Jaime McLeod { 03.17.14 at 6:53 am }

That really depends on where you live, Laura Knox. Talk to someone at your local greenhouse or agricultural extension office.

21 Laura Knox { 03.16.14 at 10:49 pm }

The full worm moon is the indication to start planting seeds indoors 6-8 weeks before last frost should be right now, but the sap isn’t running yet because of the cold winter, does this mean that sowing seeds around now (March 17) should be postponed a couple of weeks to coincide with the sap? Is the sap a good indication?

22 Dennis Fields { 03.16.14 at 7:04 pm }

Planting on moon cycles

23 Maryanne Johnson { 03.16.14 at 5:50 pm }

Information on planting during a full worm moon.

24 Estie Buzard { 04.10.13 at 3:08 pm }

I want to plant vegetable seeds and plant. I understand things grown under the ground, i.e. carrots, beets, should be planted during the dark of the moon. Things that grow above the ground. i.e. tomatoes, corn, etc. should be planted in the light of the moon. How can I find out when these times are or how they are identified on this website.

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