shiner,
One tool which may offer some insight is the USDA’s Snotel monitoring system:
http://www.wcc.nrcs.usda.gov/snotel/Colorado/colorado.html
You can select a particular monitoring site from the map of Colorado and then you can select a historical date to get a notion of what past snow accumulations might have been in October. Quickly skipping through the past five years for a couple of locations might be beneficial.
FWIW, I also do the same thing for temperatures. I like to look at the nightly lows for the past five or so years to get an idea of how cold it might get at night, and then I bring gear that is appropriate. Nothing says that you won’t run into an “outlier” event during your hike, but at least it’s a starting point.
Loup