I once tried the south side of baker around October 10. It snowed around 8 inches overnight and the next day, most of the crevasses were covered with a thin snow layer. We made a attempt anyway, with every step taken after being probed by a basketless ski pole. After an hour of this torment, my last climber on the rope team punched in while following steps. We bailed.
but if the weather keeps the way it is going, early October could be fine except for the maze of open crevasses.