2025 Against the Tide Events

Against the Tide is a family-friendly, multi-sport, rain or shine 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. The participation of minor children under the age of 18 in the Against the Tide events must be authorized by a parent or guardian, and the parent/guardian must sign the Release and Indemnity Agreement.

There is no early bib pickup — bibs can be picked up at registration the morning of the event. Wetsuits are permitted. 

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!

Participants can create or join a team during the registration process on Race Roster. Please note that new teams cannot be created after registration is complete.

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.

Click the links below to view the RaceRoster event pages and donate to a participant or team:

Hopkinton’s 33rd Year – June 14th
Brewster’s 26th Year (Cape Cod) – June 21st
Virtual – June 14th to June 21st

For technical support with registering or setting up your fundraising page, please contact Race Roster at +1 855-969-5515 or https://raceroster.com/contact.

Online registration closes at 5:00 PM the evening before each event. Walk-in registration is welcome the morning of the event at the registration tent starting at 7:00 AM.

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: 025-W003
  • Hopkinton: 025-W002

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 https://www.wcvb.com/upload!

Thank you to the kind and generous Against the Tide sponsors! Their support is essential to making these events possible and advancing MBCC’s mission of breast cancer prevention. We encourage you to view the full list of sponsors by clicking HERE.