12 events in Cambridge, Massachusetts
From big races to Saturday morning group runs—find 5k events and connect with the local endurance sports community.
Cambridge
12 events in Cambridge-
Thu, Dec 18, 2025 at 9:30 AMSee full details
Purchase and gift a Cambridge Classic 5K Season Pass registration or an individual Cambridge Classic 5K race!
2026 dates:
Spring Classic 5K - 3/29/26 @ 9:30AM
Summer Classic 5K - 6/28/26@ 9:30AM
Fall Classic 5K - 10/4/26 @ 9:30AM
Winter Classic 5K - 12/6/26 @ 9:30AM
NOTE: All Season Pass Gift Certificates must be redeemed no later than March 29, 2026 by 9 AM. The final day for the Individual Race Gift Certificate is December 6th, 2026.
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Wed, Jan 21, 2026 at 10:00 AMSee full details
The Cambridge–Watertown Community 5K is a free local run and walk event designed to bring neighbors together and encourage healthy movement across our communities.
Participants are welcome to complete their 5K anytime during the event window and submit their time online.
A suggested starting point is near Watertown Square, with a scenic route following the Charles River path toward Cambridge. From there, runners can loop near Fresh Pond Reservation before returning toward Watertown.
This suggested route highlights the natural connection between Cambridge and Watertown, but participants are free to complete their 5K in any safe location that works best for them.
Many choose to run:
Along the Charles River Greenway
Near Fresh Pond in Cambridge
Around Arsenal Yards
Through East Watertown neighborhoods
Along Mount Auburn Street connecting both towns
All fitness levels are welcome.
Run it competitively. Walk it with family. Invite a friend from a neighboring town.
The goal is simple:
Encourage healthy habits
Connect local communities
Highlight the strength of Cambridge and Watertown
Whether you live in Cambridge, Watertown, Belmont, or nearby Middlesex County towns, this event is open to you.
Move local. Stay active. Represent your neighborhood.
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Sun, Mar 29, 2026 at 9:30 AM
Start and finish in beautiful downtown Cambridge, Massachusetts.
Take a springtime stroll or sprint down Mass Ave. The course is fast and flat so you can get back to the post-race party sooner!
Registration fees:
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$40 – until 1/20
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$42.50 – 1/21 to 2/22
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$45 – 2/23 to 3/22
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$50 – 3/23 to race day (if available)
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Sun, May 17, 2026 at 9:00 AM
This race is for EVERYONE.
RUN or ROW
5K or 1 Mile
Sunday, May 17th @ 9AM
Set up a fundraising page or click the donate button to support the Bionic Project's education program. See fundraising prizes below!
*Any individual with a permanent physical disability is invited to participate free of charge by entering the promo code ADAPTIVE when registering for an event.
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Sun, May 31, 2026 at 10:00 AMSee full details
The Cambridge 5K @ CambridgeSide is a flat and fast race through the heart of East Cambridge & Inman Square. The race starts & finishes at CambridgeSide and is immediately followed by a post-race party at the new CanalSide Food + Drink hall. Registration includes a short-sleeve technical t-shirt, 5 complimentary parking voucher, and a post-race celebration. The race benefits the MSPCA & the Helen K. Holland Animal Care Trust Fund.
After crossing the finish line at this year's Cambridge 5K @ CambridgeSide, DJ Smooth Bee will keep the party going at CanalSide Food + Drink, CambridgeSide's newly opened energetic food and drink experience featuring spectacular waterfront views, a collection of exciting eateries, and a centrally located bar. Redeem your 2 tear-off drink tickets at C-Side Bar for the signature 5K beer: Zero Gravity – Green State Lager.
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Sun, Jun 28, 2026 at 9:30 AM
Starts and finishes in beautiful downtown Cambridge, Massachusetts
Make it a summer stroll or an all-out sprint down Massachusetts Avenue. The course is fast and flat so you can get back to the finish line sooner!
Registration fees:
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$40 through 4/12
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$42.50 from 4/13 through 5/17
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$45 from 5/18 through 6/21
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$50 from 6/22 through race day
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Every Saturday at 9:00 AM
parkrun is such a simple concept: turn up every Saturday and volunteer, walk, jog or run 5k.
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Sun, Sep 27, 2026 at 10:00 AMSee full details
Who does the race benefit and who does it honor?
Our race benefits the young girls of Cambridge. The Cambridge Girls Softball League and other girls' sports teams are the primary recipients of the funds from the race. These great organizations work on team building, athletic skills, and strengthen the connection among physical, mental and social well-being of girls. We've raised over $130,000 for girls' sports in Cambridge!
Post-Race Block Party
After the race there will a block party outside Paddy's until 7PM. Walden Street will be closed off to traffic and there will be a large beer garden, food trucks, and a DJ.
Is the race sanctioned and timed?
The 5K is USA Track and Field sanctioned and timed by RaceWire.
Parking
Parking will be available at Danehy Park.
Number Pick-up
Registration and number and shirt pick-up will be available Thursday, September 25 from 6pm - 9pm; Friday, September 26 from 4p-7p and Saturday, September 27 from 12p-4p. In addition, sign ups will be available on race morning, September 28, from 8am - 9:30am.
T Shirts
All Participants registered before September 5 will be guaranteed to receive a shirt.
Registration Fee
$40 through July 31, 2025 - includes a free gift!
$30 for ages 17 and under
$40 through September 26, 2025
$30 for ages 17 and under
$45 on Race Day - September 27, 2025
$35 on Race Day for ages 17 and under
ONLINE REGISTRATION
Online registration ends on Wednesday, September 23 at midnight. Sign ups will be held at Paddy's Thursday, September 24 from 6pm - 9pm and Friday, September 25 from 4p-7p and Saturday, September 26 from 12p-4p. You can also sign up race day from 8:00a - 9:30a.
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Sun, Oct 04, 2026 at 9:30 AM
Start and finish in beautiful downtown Cambridge, Massachusetts. Take an Autumn stroll or sprint down Mass Ave. The course is fast and flat so you can get back to the post-race party sooner!
Registration Fees:
Cambridge Classic races sell out. Sign up early for the best prices.
$40 – until 7/19
$42.50 – 7/20 to 8/23
$45 – 8/24 to 9/27
$50 – 9/28 to Race Weekend (if available)
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Sat, Oct 31, 2026 at 10:00 AMSee full details
The Cambridge 5K is the kickoff to race weekend! It's a 3.1-mile course that starts and finishes at CambridgeSide. It's a quick out and back along the Charles River that will have you in awe of the Boston skyline.
The Cambridge Half Marathon is a 13.1-mile USATF certified course that starts and finishes at CambridgeSide. It is a fast and flat course along Memorial Drive featuring views of the Charles River, MIT, John W. Weeks Footbridge, Harvard University Stadium, and more.
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Sun, Dec 06, 2026 at 9:30 AMSee full details
Join us for a chilly run of the Winter Classic 5K!
Start and finish in beautiful downtown Cambridge, Massachusetts.
Make it a winter stroll or an all-out sprint down Mass Ave. The course is fast and flat so you can get back to the finish line sooner!
Festive attire is encouraged but not mandatory.
REGISTRATION FEES:
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$40 until 10/11
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$42.50 from 10/12 through 11/1
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$45 from 11/2 through 11/29
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$50 from 11/30 through Race Day (if available)
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Local Clubs & Organizations
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Club
USA Swimming Club. Safe Sport Recognized. 257 members.
[email protected] +1 617-818-7622 -
Club
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Club
USA Swimming Club. Club Excellence: Bronze. Safe Sport Recognized. 239 members.
[email protected] +1 978-569-5155 -
Club
USA Swimming Club. Club Excellence: Silver. Safe Sport Recognized. 444 members.
[email protected] +1 508-446-0437 -
Club
USA Swimming Club. 3 members.
[email protected] +1 617-495-2268