You should get a calender every year from the ERZ, detailing which week / day your post code will be up for collection of cardboard, paper, clothes, blah blah blah blah. You can dispose of them then.

Alternatively, go to this site - which I suspect InselAffe is referring to:

http://www.stadt-zuerich.ch/ted/de/i...skalender.html

All the streets in Zurich are listed. Just select yours and what you want to recycle. Should list the dates for collection for your house, for the entire year.