The keyword for you is weather. Last year in mid-October, four hikers from Omaha hiked into whiteout conditions, and then huddled in the summit hut for several days until they were rescued by helicopter.

If there are no significant storms, you will be ok. But if there are, be sure you know when to turn around.

Check the Unused Whitney Permits - 2010 information for October last year to see how many people actually pulled permits.