Living in Switzerland, Alpine passes and roads basically can pick up snow as of end of Summer. The passes were closed (for a brief period) once already this year, they re-opened as soon as the snow is gone or roads are cleared. You will need to check conditions before you head off to the mountains to see if any snow fall predicted and check on road and pass conditions. Oct/Nov can be snowy already....so better be prepared with winter tyres and chains. If you are lucky, you find no snow. Here's a good site to check on weather etc.
http://www.viamichelin.co.uk/web/Weather
other than that, enjoy your ride !