Month
13: Orlando Bloom (Legolas) 1977
28: Elijah Wood (Frodo Baggins) 1981
February
25: Sean Astin (Samwise "Sam" Gamgee) 1971
March
18: Brad Dourif (Grima Wormtongue) 1950
20: Lawrence Makoare (Lurtz, the Witchking, and Gothmog) 1968
April
4: Hugo Weaving (Elrond) 1960
17: Sean Bean (Boromir) 1959
20: Andy Serkis (Gollum and Smeagol) 1964
May
5: John Rhys-Davies (Gimli) 1944
14: Cate Blanchett (Galadriel) 1969
25: Ian McKellen (Gandalf) 1939
27: Christopher Lee (Saruman) 1922
June
7: Karl Urban (Eomer) 1972
30: Marton Csokas (Celeborn) 1966
July
1: Liv Tyler (Arwen) 1977
August
8: John Noble (Denethor) 1948
28: Billy Boyd (Peregrin "Pippin" Took) 1968
September
12: Ian Holm (Bilbo Baggins) 1931
21: David Wenham (Faramir) 1965
October
20: Viggo Mortensen (Aragorn) 1958
31: Peter Jackson (Director, writer, and producer) 1961
[I know he's not part of the cast, but I can't leave him out.]
November
12: Craig Parker (Haldir) 1970
December
6: Dominic Monaghan (Meriadoc "Merry" Brandybuck) 1976
16: Miranda Otto (Eowyn) 1967
17: Bernard Hill (Theoden) 1944