Celtic Tree Sign Calculator
Find your tree among the thirteen trees of the popular Celtic tree calendar.
Find your tree
Choose your birth month and day. The year does not matter.
Pick a date, then press the button to see your tree.
Where this calendar comes from
The thirteen-tree calendar is a modern invention, not an ancient Celtic one. It was popularised by Robert Graves in The White Goddess (1948), who built it on the names of the Ogham letters. The Ogham alphabet and its letter names are genuinely old, but the idea of assigning a tree to each part of the year has no known ancient source. Treat it as a fun modern tradition, in the same spirit as a horoscope.
| Tree | Dates | Ogham letter |
|---|---|---|
| Birch | 24 Dec – 20 Jan | ᚁ Beith |
| Rowan | 21 Jan – 17 Feb | ᚂ Luis |
| Ash | 18 Feb – 17 Mar | ᚅ Nion |
| Alder | 18 Mar – 14 Apr | ᚃ Fearn |
| Willow | 15 Apr – 12 May | ᚄ Sail |
| Hawthorn | 13 May – 9 Jun | ᚆ Uath |
| Oak | 10 Jun – 7 Jul | ᚇ Duir |
| Holly | 8 Jul – 4 Aug | ᚈ Tinne |
| Hazel | 5 Aug – 1 Sep | ᚉ Coll |
| Vine | 2 Sep – 29 Sep | ᚋ Muin |
| Ivy | 30 Sep – 27 Oct | ᚌ Gort |
| Reed | 28 Oct – 24 Nov | ᚍ nGéadal |
| Elder | 25 Nov – 22 Dec | ᚏ Ruis |
| No tree | 23 Dec | The extra day |
Birch (Beith)
24 Dec – 20 Jan · Ogham ᚁ
Renewal, ambition and a steady climb. Birch is the first tree of the year and is associated with fresh starts and quiet resilience.
Rowan (Luis)
21 Jan – 17 Feb · Ogham ᚂ
Idealistic and thoughtful. Rowan is linked with protection and with people who see the bigger picture before others do.
Ash (Nion)
18 Feb – 17 Mar · Ogham ᚅ
Imaginative and intuitive. Ash is the tree of connection, tied to creative, sensitive and independent-minded people.
Alder (Fearn)
18 Mar – 14 Apr · Ogham ᚃ
Confident and self-reliant. Alder is associated with pioneers, who like to start things and trust their own judgement.
Willow (Sail)
15 Apr – 12 May · Ogham ᚄ
Adaptable and perceptive. Willow bends without breaking, and is linked with intuition, emotion and quiet strength.
Hawthorn (Uath)
13 May – 9 Jun · Ogham ᚆ
Lively and contradictory. Hawthorn is associated with protection, sociable energy and a mix of caution and daring.
Oak (Duir)
10 Jun – 7 Jul · Ogham ᚇ
Steady, generous and strong. Oak is the classic tree of endurance and is linked with dependable, protective people.
Holly (Tinne)
8 Jul – 4 Aug · Ogham ᚈ
Fair-minded and determined. Holly is associated with courage, loyalty and a strong sense of justice.
Hazel (Coll)
5 Aug – 1 Sep · Ogham ᚉ
Curious and analytical. Hazel is the tree of wisdom in Irish tradition, and is linked with learning and careful thinking.
Vine (Muin)
2 Sep – 29 Sep · Ogham ᚋ
Discerning and passionate. Vine is associated with refinement, strong feeling and high standards.
Ivy (Gort)
30 Sep – 27 Oct · Ogham ᚌ
Loyal and tenacious. Ivy clings on and keeps growing, and is linked with persistence and resourcefulness.
Reed (nGéadal)
28 Oct – 24 Nov · Ogham ᚍ
Perceptive and private. Reed is associated with depth, a sharp eye for what is going on underneath and a taste for secrets.
Elder (Ruis)
25 Nov – 22 Dec · Ogham ᚏ
Changeable and free-spirited. Elder is linked with transformation, endings that lead to beginnings and an independent streak.
Frequently asked questions
Is the Celtic tree calendar really ancient?
No. The popular 13-month tree calendar comes from the poet and writer Robert Graves, who set it out in his 1948 book The White Goddess. It borrows the names of Ogham letters, but there is no evidence that the ancient Celts used a tree zodiac or a calendar like this.
What is my Celtic tree sign?
Enter your birth date in the calculator above. The popular version divides the year into thirteen periods of about four weeks, each named after a tree, plus one extra day, 23 December, that most versions leave without a tree.
Do all sources give the same dates?
No. Different books and websites shift the dates by a day or two, and some use a different set of trees. This page uses the most widely repeated version, so your result may differ slightly elsewhere.
What does Ogham have to do with it?
Ogham is the early Irish alphabet. Its letters have traditional names, many of which are also tree or plant names, and the modern tree calendar reuses thirteen of them. The link is a modern one: the letter names are old, but pairing them with dates of the year is not.
Is a Celtic tree sign the same as a zodiac sign?
No. Your zodiac sign comes from Western astrology, which is based on the position of the Sun against the constellations through the year. The tree sign is a separate, modern system. They can be enjoyed side by side, and you can read your daily horoscope on the home page.
Keep exploring
See your Ogham letters in full with the Ogham name converter on Gods of Ireland, read your daily horoscope, or check how two signs get on in zodiac compatibility.