City elections in Cottage Grove are held in November of even-numbered years. City Council elections are non-partisan and candidates run for their seats at large. School District 833 elections are held in November of odd-numbered years.
National, state, and county general elections also are held in November of even-numbered years. National, state, and county primaries are held in August of even-numbered years. Minnesota has a consolidated primary ballot that allows voters to make a secret choice of a major party primary.