2012 Rochester New York St. Patrick’s Day Parade: When is the Parade? March 17, 2012 and it starts at 12:30pm Where is the Parade? It's at downtown Rochester starting on East Avenue, going to Main Street and ending at Plymouth Avenue. How long has the Parade been a tradition in Rochester? In 2012, the St. Patrick's Day Parade is celebrating its 35th year as a Rochester tradition. Who organizes the Parade? There is a devoted group of volunteers to the Rochester St. Patrick's Day Parade Committee. Anyone that is interested in joining us should call us at (585) 234-5167 or email us with email addresses located on the contact page. How many people attend the Parade? In 2009, there were approximately 120,000+ spectators at the Rochester St. Patrick's Day Parade.