best zones

ALL HORDE ALL DAY

1-10
S tirisfal glades
A durotar
C mulgore

10-20
S barrens > B silverpine

15+
A Stonetalon mtns
C Ashenvale
B Hillsbrad

25+
F 1k needles

30+
A Alterac
S Arathi
S STV

35+
A Desolace
F Badlands
F Swamp of Sorrows

40+
F Hinterlands
S Tanaris
C Feralas

45+
D Searing Gorge
C Azshara
F Blasted Lands
S UnGoro
B Felwood

50+
C Burning steppes
S Western Plaguelands
S Eastern Plaguelands
F Winterspring
F Moonglade
F Silithus