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Celtic Tree Calendar · Free chart

Free Celtic Tree chart

Your Celtic Tree month is set by your birthday alone, in Robert Graves' calendar of thirteen 28-day months that begins on 24 December: Birch to 20 January, Rowan to 17 February, and on to Elder, which ends on 22 December, with 23 December left over as his extra day. Each month carries an Ogham letter.

Enter your birth date to see your tree month in Robert Graves' calendar and its Ogham letter drawn on its stemline, with the letter's Irish name and its medieval kenning.

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About Celtic Tree Calendar

Born on 19 January, your Celtic Tree month is Birch, the first of the thirteen, and your letter is Beith: the chart draws it as one stroke on its stemline, with its Irish names, the two-word kenning the medieval scribes gave it, and your month marked among the thirteen.

The thirteen tree months of 28 days are the poet Robert Graves' calendar, from The White Goddess (1948); the letters and kennings are from the Early Medieval Irish Ogham tradition, in George Calder's 1917 translation.

How we compute it

The day and month of birth looked up in Graves' thirteen 28-day months from 24 December (The White Goddess, 1948), with 23 December as his extra day; the kenning in George Calder's translation (1917).

The tree months and their dates

Robert Graves' thirteen months of 28 days and his extra day, the same dates every year, as our engine counts them.

MonthTreeOgham letterDates
1Birch Beith24 December to 20 January
2Rowan Luis21 January to 17 February
3Ash Nion18 February to 17 March
4Alder Fearn18 March to 14 April
5Willow Sail15 April to 12 May
6Hawthorn Uath13 May to 9 June
7Oak Dair10 June to 7 July
8Holly Tinne8 July to 4 August
9Hazel Coll5 August to 1 September
10Vine Muin2 September to 29 September
11Ivy Gort30 September to 27 October
12Reed nGéadal28 October to 24 November
13Elder Ruis25 November to 22 December
The extra daynone 23 December

An example

The sample person's month

The Ogham letter Beith, B, drawn upright on its stemline.

Birch month

24 December to 20 January; day 27 of 28

Ogham letter Beith, the letter B

Old Irish beithe; the name means birch.

“faded trunk and fair hair”

féochos foltchain, the letter's kenning; tr. George Calder, 1917

Graves' year, from 24 December

  1. Birch · Beith 24 December to 20 January
  2. Rowan · Luis 21 January to 17 February
  3. Ash · Nion 18 February to 17 March
  4. Alder · Fearn 18 March to 14 April
  5. Willow · Sail 15 April to 12 May
  6. Hawthorn · Uath 13 May to 9 June
  7. Oak · Dair 10 June to 7 July
  8. Holly · Tinne 8 July to 4 August
  9. Hazel · Coll 5 August to 1 September
  10. Vine · Muin 2 September to 29 September
  11. Ivy · Gort 30 September to 27 October
  12. Reed · nGéadal 28 October to 24 November
  13. Elder · Ruis 25 November to 22 December
  14. The extra day 23 December
A fictional person born on 19 January 1989: their tree month, Birch, with its Ogham letter Beith drawn upright on its stemline and the letter's medieval kenning, and Graves' thirteen months and the extra day, with their month outlined.

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