Worm Moon: origin of the name, symbolism and March full moon
The Worm Moon is the March full moon in North American almanacs: earthworms or grubs? Origin of the name, rival names, link with Easter and simple gestures.
Key points
| Month | March (northern hemisphere) |
|---|---|
| English name | Worm Moon |
| Origin of the name | Earthworms reappearing as the ground thaws, or grubs under the bark according to Carver (1778) |
| Other names cited | Crow Moon, Sugar Moon, Lenten Moon, Snow Crust Moon |
| Approximate dates | 3 March 2026; 22 March 2027 (Paris time, approximate calculation) |
| Link with Easter | The first full moon from 21 March (by convention) sets the date of Easter Sunday |
The full moon of the thaw
The Worm Moon is the nickname for the March full moon. In North America, March is the month when the ground thaws, sap rises in the maples and the first birds return. In the northern hemisphere, the season turns towards spring around the equinox at the end of March; the March full moon falls before or after it, depending on the year. In France, the month also brings the switch to summer time, which suddenly shifts the times of moonrise.
Earthworms, or something else?
The Old Farmer's Almanac explains the name by the earthworms that come back to the surface as the ground warms, drawing the birds. But Jonathan Carver's text (1778), which fixed this list of moons, speaks of “worm” in the sense of grubs emerging from tree bark. The almanacs may therefore have altered the original meaning. In English, worm can refer to a grub as much as to an earthworm.
Earthworms do not come up because of the Moon: they rise when the soil is moist and mild, and rain drives them up. Charles Darwin devoted his last book to them, in 1881, to show how these humble animals churn and enrich the soil at depth.
Rival names, European names
For March, the almanacs offer several other names: Crow Comes Back Moon (among the northern Ojibwe), Sugar Moon (when maple sap is gathered, among the Ojibwe), Snow Crust Moon (a name given among the Anishinaabe), and Lenten Moon, a term attested in the Maine Farmers' Almanac of 1937: it is the last full moon of winter, before Christian Lent. Among Bede's Anglo-Saxons, the month of March was called Hrethmonath, after a goddess Hretha of whom almost nothing is known.
Another curiosity: for the Romans, March was the first month of the year, until the start of the civil year was fixed at 1 January, in 153 BCE. Traces remain in September (the “seventh” month), October, November and December, whose names no longer match their rank.
The March sky
March is the month when daylight grows fastest: about three minutes more each day at our latitudes, depending on the region. Around the equinox, the full moon rises almost exactly in the east and sets in the west, the opposite of the Sun. It culminates at a middling height, about 40 degrees in Paris (give or take 5 degrees depending on the year), much lower than the December and January ones. When it is low, its light crosses more atmosphere: it looks yellower or orange near the horizon, like the Sun at sunset.
This change of height from one month to the next is a concrete way of feeling the cycle of the seasons: in winter the full moon is high and the Sun low; in summer it is the reverse.
Easter and the March full moon
The spring full moon sets the date of Easter for Western Christians: it is the Sunday after the first “ecclesiastical” full moon falling from 21 March onwards. It is not the full moon observed in the sky, but the one in the calculation tables, which may differ by a day.
| Year | Astronomical full moon | Easter |
|---|---|---|
| 2026 | 3 March (before 21 March: does not count), then 2 April | 5 April |
| 2027 | 22 March | 28 March |
The Worm Moon is therefore sometimes the “Easter moon” and sometimes not: it depends on where it falls relative to 21 March. This is one of the reasons Easter varies between 22 March and 25 April.
Modern symbolism
In modern practices, the Worm Moon is the moon of awakening: what stayed underground through the winter comes back to life. It is associated with rebirth, with turning the soil, and with cultivating patience. Neopagans link it to Ostara, their spring equinox festival. Again, these links are modern; they have no proven value.
Simple gestures
- Open the windows and do a big spring clean, using products you know well.
- Look at the soil: under a stone or a pile of leaves, look for worms, woodlice and first shoots (put them back afterwards).
- Sow in pots on a windowsill: tomatoes, herbs, seasonal flowers.
- Note what wakes up in you after winter, in a notebook.
See also the simple Ostara ritual. None of these gestures promises a result: they are occasions to slow down and observe.
Frequently asked questions
Why “worm”?
According to the Old Farmer's Almanac, because of the earthworms that come back to the surface when the ground thaws. Carver, who published the list in 1778, spoke rather of grubs emerging from tree bark.
Is the Worm Moon always in March?
Yes, it is the name of the March full moon. It can fall before or after the equinox, depending on the year.
What is the connection with Easter?
Easter is fixed by reference to the first spring full moon from 21 March. The Worm Moon is that moon only in some years.
What is the Lenten Moon?
An alternative name, cited in an almanac of 1937, for the last full moon of winter, before Easter.
Should I do anything special?
No. The season lends itself to observing nature and to sowing, but no particular gesture is required.
Also read
The meanings mentioned belong to tradition and symbolism. They are neither promises of results nor medical advice. Back to The Wheel of the Year.