In reply to nicnic: That's a bit of a crystal ball question, but on balance I would probably go for end of Feb. There have been winters when it's all over on the west coast by mid March, whereas feb should in theory be colder (on average) and have more chance of a good covering of lying snow on the ridge. There's plenty of daylight in feb - we did the traverse in early jan last winter with trail breaking the whole way (although we did have 4 of us breaking trail).