In reply to Tyler: I've skied it as early as mid December, but that was a very snowy start to the season. Usually it's not a good bet until mid January. Things are different every season. Better to stay flexible - book a ticket, go skiing, and do what the conditions allow you to do. You may have more luck skiing the Pas de Chevre from Grand Montet, or the Toule Glacier from the Helbronner in early season conditions.
Have a great trip....