In October, most of the attractions will be open (all the major attractions will definitely be open unless there are mechanical or techical problems). The crowds are very small earlier in October with crowds getting larger and larger closer to Halloween. My advice is to go on a Friday or the last three days of October (Monday, Tuesday, or Wednesday) since crowds will be pretty much non existant, except for X. SFMM is open from 10 am to 10 pm every Friday, Saturday, and Sunday throughout October. The park is also open October 29-31 with the same hours.
And another thing, most of the water rides will be open with Xtremely short lines.
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http://home.earthlink.net/~sfmm84/ Six Flags Magic Mountain Xtreme Guide
*** This post was edited by Matthew on 8/16/2001. ***