Boston 5K Spring/Summer Series

This page is only for signing up to volunteer. Please navigate to the volunteer section to view the various shifts available.

Please find all other race info on our event page: Boston Spring Series.

The Boston Spring/Summer Series is made possible each year thanks to the help of our wonderful volunteers. We greatly appreciate your support! As a volunteer, you'll assist with number pickup, venue setup, registration, bag check, water stops, marshaling, medals/awards, and cleanup.

The Race:

One of eight 5K Thursday evening runs from April through September to kick cancer's butt. The 5/21 race starts with a Women’s 5K, followed by the Open 5K ~30 minutes later. 

All races are held at the American Legion Marsh Post #442 in Cambridge, MA, and run on paths along the Charles River. Each event will include a post-race party at the Marsh Post with beer generously provided by Mighty Squirrel. 100% of the event proceeds go to charity, including a portion to the American Legion Marsh Post. RACE Cancer Foundation’s Boston 5K Summer Series also provides funding for the Sunscreen Squad, bringing free sunscreen to outdoor events across Massachusetts.

Join fellow runners on May 21, 2026 for the Boston 5K Spring/Summer Series. It's a fantastic 5K featuring a flat and fast course in Cambridge.