Against the Tide is a family-friendly, multi-sport event to benefit the Massachusetts Breast Cancer Coalition (MBCC). The funds raised through Against the Tide help to support and expand our community education program Let’s Talk Prevention: Reducing Toxic Exposures, MBCC Webinar Series, and the newly-expanded student environmental health program, Let’s Talk Prevention: Actions You Can Take.

We are grateful to all of you who help prioritize breast cancer prevention. Above and beyond your commitment to participate in the Against the Tide event, we hope that you will create or join a team and fundraise on behalf of MBCC and our important mission to change the legacy of breast cancer for future generations. Refunds are not allowed for this event.

If you are unfamiliar with the process to create or join a team and fundraise, scroll down to the Event Information section below for helpful documents. Also available is a fundraising pledge sheet to help record and track your fundraising!

Click below to register for Against the Tide or donate to a participant or team:

Online registration for the June 8th Cape Cod Against the Tide event will close on June 7th at 6PM EDT. Online registration for the June 15th Hopkinton Against the Tide event will close on June 14th at 6PM EDT.

Walk-in registration is welcome on the morning of each event starting at 7AM. However, given the locations of the in-person events, please be aware that the internet connection may be limited and MBCC might have to rely on cash transactions.

Virtual Event Information: By registering for any single virtual event component, you will be able to submit results to any, or all, of the events you would like to virtually participate in. That means you can build your team, fundraise, and participate in as many virtual Against the Tide components that you want!

Event Information

Route Maps

USATF Certification Codes

  • Brewster 5K: MA23006BK
  • Brewster 10K: MA23007BK
  • Hopkinton 5K: MA15005BK
  • Hopkinton 10K: MA15006BK

USMS Open Water Sanction Numbers

  • Brewster: 024-W003
  • Hopkinton: 024-W004

WCVB Channel 5 is a proud media partner for Massachusetts Breast Cancer Coalition’s Against the Tide

After Against the Tide, post your pictures to!

MBCC deeply appreciates the generous support provided by our Against the Tide sponsors; click HERE to see our full list of sponsors!

Any interested student should reach out to Charles McGinn ( to learn more about volunteering and sign up for either ATT event.

Available volunteer roles include Event Greeters, Vendor Support, Swim Guide, Run Guide, Walk Guide, and Event Set-Up and Tear-Down.

Volunteer support is needed on the day of the event as well as for the day before, and shifts range from 6AM to 1PM.

Parents and community members are also welcomed to volunteer and should send Cheryl Osimo an email to set up a Zoom meeting for more information.