Boston Buildup Winter Series

A series of four progressively longer races. Now in its 44th year, this edition will include modifications to accommodate pandemic restrictions and guidelines

You may register for any of the four individual events or for the full four-race Series. The first 125 Series registrants will receive custom Buildup socks, to be distributed prior to or at the first race.

Please note that while we hope to be able to conduct all the  races of the Series as in-person events, the ability to do so is based on permission from the state and towns. While we will make every effort to hold the races in person, including changing the location, the fluctuating nature of the COVID virus makes it possible that some of the races will need to be held as Virtual events. Please read our RefundPolicy before registering.