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Celtic Tree Calendar: Interpreting the Ogham Alphabet

Updated on:


Written by: Dawn Black (Witchipedia)


Reviewed by: Tina Caro

The Celtic tree calendar, also called the Beth-Luis-Nion Calendar, is a modern calendar based on modern, theoretical interpretations of the Ogham alphabet, or the Celtic Tree Alphabet.

While there is no evidence of ancient Celts or Druids using a calendar that even resembled this one, it has, however, become a valuable spiritual, liturgical and magical tool for some modern NeoPagans who identify with the ancient Celts. Celtic Reconstructionist Pagans reject it utterly as a complete fabrication with no historic basis.

Which of course, it is. Others embrace it as a tool to enhance their magic, their spirituality and their connection with nature and to help give structure to their rituals.

A Celtic tree calendar was first posited in the 19th century by Edward Davies based on research of the Ogygia and the Book of Ballymote further developed by Robert Graves in his book The White Goddess and further developed by Ross Nichols.

The calendar has 13 months of 28 days and an extra day posited as the “year and a day” day. It begins with the winter solstice, in contrast to the tradition of Samhain as the Celtic New Year.

Ogham Alphabet and Tree Correspondences

Ogham LetterCeltic TreeTree Meaning and Symbolism
BeithBirchRenewal, beginnings, purification, fertility, and new possibilities.
LuisRowanProtection, warding off negativity, enhancing intuition, and vision.
NionAshConnection, transformation, healing, and spiritual growth.
FearnAlderBalance, inner strength, courage, and the ability to face challenges.
SailleWillowIntuition, divination, emotions, creativity, and lunar energy.
HuathHawthornProtection, love, boundaries, spiritual growth, and fertility.
DuirOakStrength, endurance, wisdom, stability, and ancestral connections.
TinneHollyProtection, luck, personal power, harmony, and spiritual guidance.
CollHazelWisdom, inspiration, creativity, knowledge, and poetic abilities.
QuertAppleHealing, love, youthfulness, beauty, and the cycle of life.
MuinVineTransformation, introspection, cycles of life, and spiritual growth.
GortIvyConnection, determination, growth, protection, and perseverance.
NgetalReedAdaptability, purification, healing, growth, and protection.
StraifBlackthornTransition, endings, challenges, purification, and inner transformation.
RuisElderProtection, wisdom, transformation, and the cycle of life and death.
AilmPineInner peace, clarity, purification, spiritual growth, and rejuvenation.
OnnGorsePositivity, hope, protection, resilience, and overcoming challenges.
UrHeatherSpiritual growth, self-discovery, intuition, and healing.
EadhaAspenTransformation, courage, communication, and connection to the Otherworld.
IodhadhYewImmortality, rebirth, protection, spiritual enlightenment, and ancestral wisdom.
IdhoAspenTransformation, courage, communication, and connection to the Otherworld.
LusRowanProtection, warding off negativity, enhancing intuition, and vision.
OirSpindleInspiration, creativity, divination, and fostering artistic abilities.
UilleannHoneysuckleProsperity, abundance, attraction, and harnessing positive energies.
PhagosBeechWisdom, knowledge, strength, growth, and the cycles of life.
MorIvyConnection, determination, growth, protection, and perseverance.
GortIvyConnection, determination, growth, protection, and perseverance.
AcanReedAdaptability, purification, healing, growth, and protection.
UraHeatherSpiritual growth, self-discovery, intuition, and healing.
EadhaAspenTransformation, courage, communication, and connection to the Otherworld.
IohoYewImmortality, rebirth, protection, spiritual enlightenment, and ancestral wisdom.

Graves’ Celtic Tree Calendar

  • Beth (Birch) December 24th to January 20th
  • Luis (Rowan) January 21 to February 17
  • Nion (Ash) February 18 to March 17
  • Fearn (Alder) March 18 to April 14
  • Saille (Willow) April 15 to May 12
  • Uath (Hawthorn) May 13 to June 9
  • Duir (Oak) June 10 to July 7
  • Tinne (Holly) July 8 to August 4
  • Coll (Hazel) August 5 to September 1
  • Muin (Vine) September 2 to September 29
  • Gort (Ivy) September 30 to October 27
  • Ngetal (Reed) October 28 to November 24
  • Ruis (Elder) November 25 to December 22
  • December 23 Extra day for “Year and a Day”

Variations on the Calendar

Due to its obvious limitations, the calendar has been changed a little here and there to fit with various traditions. Some have altered the start dates of the month to begin on the new moon or the full moon make the calendar more in line with lunar tradition and many believe the calendar should have been started at Samhain, which is regarded as the traditional Celtic New Year.

Gregorian Variation

A simpler variation based on the Gregorian calendar makes it much easier to keep track of though it has many problems. As many believe the calendar should begin on November 1st to correspond with Samhain as the Celtic or Witches New Year, this variation would assign Beth to November, Luis to December and so on. However, this leaves the problem of what to do with the extra month. One solution is to declare Ruis an extra month for leap years.

Lunar Variation, beginning at Samhain

This variation begins with Beth at Samhain and ending on the first new moon (or full moon) after Samhain. It is true that this could result in Beth lasting only a day, but it follows with the tradition of lunar days. The new moon starts the first lunar day and the next moonrise starts the second lunar day, the first may last only a few minutes. This also solves the problem of extra moons and extra days. The extra “Year and a Day” day posited by Graves would occur on Samhain eve.

Full Moon Names

Much more widely accepted than the calendar is naming the full moons based upon it. If you follow Graves’ model of beginning with the winter solstice, the first full moon after the winter solstice would be the Birch moon, etc. More popular, however, is the Samhain as New Year model, in which case the first full moon after Samhain, November, is the Birch moon.

The next in November/December is the Rowan Moon, then the Ash Moon in December/January, the Alder Moon in January/February, the Willow Moon in February/March, the Hawthorn Moon in March/April, the Oak moon in April/May, the Holly Moon in June/July, the Hazel moon in July/August, the Vine moon in August/September, the Ivy moon in September/October, the reed moon in October and the Elder moon, the 13th moon when needed.

Celtic Tree Astrology

In The White Goddess, Grave suggested a system of astrology that went along with this calendar. This idea has been further developed in modern times.

More Information on the Web

Further Reading

The Book of Druidry by Ross Nichols
The Handbook of Celtic Astrology by Helene Patterson
Year of Moons, Season of Trees by Pattalee Glass-Koentop

About Morningbird (Witchipedia's Founder)

I am a homesteading hearth witch who grew up along the shores of the Hudson River and has lived among the Great Lakes for the past 20 years. Together with my musical husband and youngest child, I steward a one-acre mini homestead with herb, vegetable and flower gardens, chickens, ducks, geese and rabbits, and areas reserved for native plants and wildlife. 

I have three children; two are grown, and I have been practicing magick alone and with family and friends for over 30 years.

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