How the Celtic Tree Zodiac works

This calculator uses the modern Gregorian thirteen-tree table popular in contemporary Celtic tree zodiac lists. It is not an astronomical lunar calendar and does not follow the old Ogham lunar months.

The ranges are inclusive. Birch runs from 24 December to 20 January, and 23 December is elder. 29 February is counted as ash.

The result is a single tree for the given month and day. There is no compatibility reading between trees. The content is cultural and for entertainment only.