On November 5, 2013, Green Party members won these non-partisan elections: Anna Trevorrow to the Portland, Maine, School Board; Josh Plourde to the Bangor, Maine, city council; Cam Gordon to the Minneapolis city council; and Brian Cummins to the Cleveland, Ohio, city council. Also, Green Party members won 16 non-partisan local races in California. See here for the list. The winners in 2013 are high-lighted in yellow, but some of the winners were elected in earlier months in 2013.
There are probably other wins, which will be reported when they are known. Thanks to Michael for the list of California Green wins.