In our Foundational Druidry Course one of the first things Dedicants learn to do is to calculate the month of their birth and to find the tree associated with it. This can sometimes be confusing because we use a lunar calendar of 13 months rather than the familiar 12 month solar calendar.

Because of the nature of having 28-day months, a universal calendar can be constructed that can make it easier to find your birth moon and therefore your birth tree. The starting date of each Tree Moon always falls on the same date, with the exception of a leap year. In a leap year the dates are slightly different.

The first step in finding your birth moon is to determine whether or not you were born in a leap year. Use the chart below to determine whether or not you were born in a leap year.

Leap Years 1900 to 2021

202020001980196019401920
201619961976195619361916
201219921972195219321912
200819881968194819281908
200419841964194419241904



If you were born in a leap year, then the starting dates for the Tree Moons are listed below. The Day of Mistletoe (or in the case of a leap year, the two days of Mistletoe) do not count as a Tree Moon. They are separate days set aside from the rest of the year. To use this chart, first find the leap year in which you were born, then find the Tree Moon that your date of birth falls into.

Leap Year Tree Calendar – Northern Hemisphere

TREE MONTHSTART DATEEND DATE
Mistletoe DaysDec. 21Dec 22
Birch MoonDec 23Jan 19
Rowan MoonJan 20Feb 16
Ash MoonFeb 17Mar 15
Alder MoonMar 16Apr 12
Willow MoonApr 13May 10
Hawthorn MoonMay 11Jun 7
Oak MoonJun 8Jul 5
Holly MoonJul 6Aug 2
Hazel MoonAug 3Aug 30
Vine MoonAug 31Sep 27
Ivy MoonSep 28Oct 25
Reed (Elm) MoonOct 26Nov 22
Elder MoonNov 23Dec 20



If you weren’t born in a leap year, the universal calendar is slightly different for the first part of the year, but the latter part of the year is the same. If you weren’t born in a leap year, use the calendar below to determine your birth moon.

Non-Leap Year Tree Calendar – Northern Hemisphere

TREE MONTHSTART DATEEND DATE
Mistletoe DaysDec. 21Dec 21
Birch MoonDec 22Jan 18
Rowan MoonJan 19Feb 16
Ash MoonFeb 16Mar 15
Alder MoonMar 16Apr 12
Willow MoonApr 13May 10
Hawthorn MoonMay 11Jun 7
Oak MoonJun 8Jul 5
Holly MoonJul 6Aug 2
Hazel MoonAug 3Aug 30
Vine MoonAug 31Sep 27
Ivy MoonSep 28Oct 25
Reed (Elm) MoonOct 26Nov 22
Elder MoonNov 23Dec 20



Now that you’ve determined your birth moon, use the chart found here to find your birth tree and its properties.

Remember, Druids believe in reincarnation, so if you don’t feel a connection with your birth tree, you can always choose another that seems a better fit.

SOUTHERN HEMISPHERE

Black Mountain Druid Order has members all over the world. When we here in the Northern Hemisphere are celebrating the winter solstice, our members south of the equator are enjoying the summer solstice. This means that their Tree Moons are slightly different from ours as well.

If you live in the Southern Hemisphere, you would use the charts below.

Leap Year Tree Calendar – Southern Hemisphere

TREE MONTHSTART DATEEND DATE
Mistletoe DaysJun 19Jun 20
Birch MoonJun 21Jul 18
Rowan MoonJul 19Aug 8
Ash MoonAug 9Sep 12
Alder MoonSep 13Oct 10
Willow MoonOct 11Nov 7
Hawthorn MoonNov 8Dec 5
Oak MoonDec 6Jan 2
Holly MoonJan 3Jan 30
Hazel MoonJan 31Feb 27
Vine MoonFeb 28Mar 26
Ivy MoonMar 27Apr 23
Reed (Elm) MoonApr 24May 21
Elder MoonMay 22Jun 18



If you weren’t born in a leap year, the universal calendar is slightly different for the first part of the year, but the latter part of the year is the same. If you weren’t born in a leap year, use the calendar below to determine your birth moon.

Non-Leap Year Tree Calendar – Southern Hemisphere

TREE MONTHSTART DATEEND DATE
Mistletoe DaysJun 19Jun 20
Birch MoonJun 21Jul 18
Rowan MoonJul 19Aug 8
Ash MoonAug 9Sep 12
Alder MoonSep 13Oct 10
Willow MoonOct 11Nov 7
Hawthorn MoonNov 8Dec 5
Oak MoonDec 6Jan 2
Holly MoonJan 3Jan 30
Hazel MoonJan 31Feb 27
Vine MoonFeb 28Mar 27
Ivy MoonMar 28Apr 24
Reed (Elm) MoonApr 25May 22
Elder MoonMay 23Jun 19



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