Writer Timothy Truman, artist Tomás Giorello and colourist José Villarrubia will reunite to adapt the tale into two six-issue miniseries.
The Hour of the Dragon was the only novel that creator Robert E Howard ever wrote about his most famous character.
"King Conan has faced many threats to his throne in Aquilonia - but none more deadly than a traitorous alliance backed by the resurrected sorcerer Xaltotun, at whose command mountains crumble," said Dark Horse.
The first miniseries will be titled King Conan: The Hour of the Dragon, and will debut in October 2013.
The second, King Conan: The Conqueror, will arrive in February 2014.
Next year will also see Arnold Schwarzenegger return to the role in The Legend of Conan.