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Cambridge 5K Race Directory 2025
Cambridge 5K Race Directory
Updated June 7th
The 2025 Cambridge 5K Race season runs from February through December with a mix of large and small events.
When running with friends, it’s about the experience and spending time together. Just about anyone can run or walk a 5K. Remember, it’s not about the finish time, it’s about a good time!
Click any race name to go to that race web site. Most listings include a link for registration.
The Cambridge 5K Race Directory – for your next 5K Share on XCambridge Summer Classic 5K
29 June | 9:30 AM | Sunday
Part of the Cambridge Classic Series, this race was introduced in 2016. Traditionally the race was run on a Thursday night. Since 2024, the race has been a Sunday morning event.
2025 registration is open: $45 through June 22nd and then $50 June 23 through race day. Race day registration is available.
This has become a very popular race and always sells out. So get your friends together now. Get 19 friends and colleagues to join you for a beautiful evening run through Cambridge and as a team you will get:
Cotton tank-top to the first 3,000 registrants. I have a few of these tank tops and love them as an alternative to the usual nylon race shirts.
The Gobshites will be playing and Castle Island Brewing will be pouring, for those over 21. You will receive two drink tickets.
I’ll be there on race day for bib pickup. Be sure to say hello!
Surprise your first time runner with a medal at the finish line! It’s a great way to build comradery on your team!
I wrote this recap of my 2023 race.
RACE Cancer Summer Series
This is an eight-race series taking place on Thursday nights taking place at American Legion Marsh Post #442 in Cambridge.
Registration is $40 per race, $45 week of and $50 on race day. You can also purchase a season pass for $199, or $87 for the first four on a Spring Pass or the last four for $129 on a Summer Pass.
If you work in Cambridge or Boston, these events make great after work races. Recruit some friends or get together an office or company team to enjoy the summer running season!
These after work events are a great way to relax with colleagues and build relationships.
Registration opens 30 minutes before the Women’s 5K (start times vary by date) Women’s 5K starts first – Open 5K starts ~35 minutes later
April 17th 6:30/7:05
May 1st 6:30/7:05
May 29th 7:00/7:35
June 12th 7:00/7:35
July 17th All at 7:00
August 7th All at 7:00
September 4th All at 6:30
September 18th All at 6:00
Races begin at 5 Greenough Blvd, Cambridge, MA
A finisher’s medal is not offered for these races. If your company team has first time 5K runners make it a night they will never forget with a 5K medal!
It’s a great way to build comradery on your team!
Paddy’s Cambridge Classic 5K
28 September | 10:00 AM | Sunday
This race benefits the girls of Cambridge by supporting the Cambridge Girls Softball League and other girls’ sports. These great organizations work on team building, athletic skills, and strengthen the connection among physical, mental and social well-being of girls.
Post-Race Block Party After the race there will a block party will be held outside Paddy’s until 7PM! Walden Street will be closed off to traffic and there will be a large beer garden and local food trucks.
2025 registration is: $40 through September 27th and $45 for day of registration. Youth 17 and under $30 through September 27th and $35 on race day.
Cambridge Fall Classic 5K
5 October | 9:30 AM | Sunday
Brought to you by the same folks who brought you the Cambridge Spring and Summer Classics.
This race takes place at the same location and runs the same great course. This is another large Cambridge race with a fast, young crowd that runs hard and stays until the beer is gone. Kids and keys are optional. The Kendal/MIT station is a short walk from this event.
2025 registration is open: $40 through July 28th , $42.50 through September 3rd, and $45 through September 29th. Then $50 through race day if available.
The weather is usually great for this race. I don’t think it has rained once. Parking can be tight, so carpool if you can.
Cambridge Half Marathon
2 November | 7:00 AM Half, 7:20 AM 5K | Sunday
The Cambridge Half Marathon is a 13.1 mile fast and flat course featuring views of MIT, John W. Weeks Footbridge, Harvard University Stadium, Charles River and more.
They used to include a 5K race, but have discontinued it.
Both courses are USATF certified and start and finish at CambridgeSide. Race registration includes quarter zip pull over (half marathon participants) or long sleeve shirt (5K participants), five complimentary CambridgeSide parking passes, training plan, race bib with timing chip, and finishing medal.
2025 registration is open: $10 for the half marathon through July 18th.
Cambridge Winter Classic 5K
7 December | 9:30 AM | Sunday
2025 registration is open at $40 through October 10th.
The Cambridge Winter Classic 5K is a great way to run one more 5K and pretend that it’s really still Fall. The weather is usually very good for this race.
The last in the Cambridge Classic Series for 2025 and you don’t want to miss it. Bring some extra clothes and leave the kids and keys at home! The Kendal/MIT station is just a short walk from the party.
Teams of 20 get their own tent with their own beer and great location near the pouring station.
The first 3,200 runners to register will receive a long-sleeved, gender-specific running shirt or a winter running hat. You can get both for an additional $12.
Get a finisher’s medal for your first time Winter Classic 5K runner!
If your company team has first time 5K runners or you are trying to recruit non-runners to join your team, the medal could be just what you are looking for.
Who doesn’t love a medal and the bragging rights that go with it? You can have a special awards ceremony at your tent after the race! Click the photo to order.
Super Sunday 5-Miler and 5K
9 February | 10:00 AM | Sunday -see you in 2026
2025 registration was $50 for adults 5K or 5 Miler, $40 for 21 and under and $25 for 18 and under.
The apre party is sponsored by Mighty Squirrel and Body Armor with live music from Beach Nights and Karate Show.
The 10 largest teams (by January 31st) will get a team tent in the beer garden. The two largest teams will have access to party buses.
There was also an indoor bag check and changing areas.
Parking is available in Kendal at several local garages. The MIT Red Line stop is about a quarter mile away.
Cambridge City Run 5K and Andrea Harvey Walk
6 April | 9:00 AM | Sunday – see you in 2026
2025 will be the 37th running of this race. It’s great to see a race that has endured through the years and continue to draw a large crowd.
Managed by Friends of Cambridge Athletics, this race loops the Fresh Pond Reservation. It stays on the trail and the service road inside of the reservation.
I ran this race when it was a 5 mile race in 2015. My recap from 2015.
Fees benefit CRLS student-athlete scholarships, team travel/equipment, and The Andrea Harvey Memorial Fund to help victims of domestic violence.
Parking is available at the Tobin School, 197 Vassal Lane. NO parking at Fresh Pond, and they will ticket!
2025 registration was $35 for adults and $25 for students. Race day registration was $45 for adults and $35 for students. CRLS/CPSD & EBHS students and 18 and under registered for FREE.
Fee for walkers was $35.00
Cambridge Spring Classic 5K
4 May | 9:30 AM | Sunday – see you in 2026
This race takes place off of Mass Ave on Sidney Street.
This is a large race with a great post race party. Public transportation is a good idea, keys and kids are optional.
I’ve run this race several times and it is always a good time. It’s great to see the fast runners and hang out with friends, old and new, at the apre race party.
This is a flat course and over a mile of the race is down Mass Ave. Total elevation gain for this Cambridge 5K is 30 feet. Get 19 of your friends to form a team and get a VIP tent complete with cold beer. The tent comes with a table and they are close to the music and pouring stations. Plus they make a great place to stow your gear and hang out with your friends.
2025 registration was: $45 for The Spring Classic or get the Season Pass for $175 through March 30th.
Bionic 5K and 1 Mile Run
27 April | 9:30 | Sunday – see you in 2026
The Bionic5K celebrates hope over despair, diversity over uniformity, possibilities over disabilities.
Run in Harvard Square or Virtually from anywhere in the world!
2025 registration was: Adults $40, under 21 $25 for the 5K, adults $30 and under 21 $20 for the 1-mile run – through April 14th.
The Bionic5K recognizes the resilience and tenacity of disabled athletes while celebrating advances in science and technology that are ushering in a new bionic age.
Whether you are running with a prosthetic, an artificial hip, an upgraded knee, an Apple Watch or a fitbit, join us. All are welcome: disabled runners, able-bodied runners, walkers, scientists, technologists, students, teachers, kids and parents.
All proceeds will benefit the Bionic Project Inc, a non-profit whose mission is to help advance new prosthetic technologies and to broaden the access to resources that promote active lifestyles and athletics for those who must overcome physical challenges.
Cambridge 5K @ CambridgeSide
1 June | 9:30 AM | Saturday – see you in 2026
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 included a short-sleeve technical t-shirt, 5 complimentary parking voucher, and a post-race celebration. The race benefited the MSPCA & the Helen K. Holland Animal Care Trust Fund.
The 2025 Cambridge 5K featured DJ Smooth Bee keeping the party going at CanalSide Food + Drink. All runners received 2 tear-off drink tickets for Zero Gravity – Green State Lager at the C-Side Bar.
Andy
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3 responses to “Cambridge 5K Race Directory 2025”
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Looks like an awesome list, Andy!
I hope you can do some of them yourself, too! Enjoy! -
Andy, I can only see your “Road to Boston 1st Taper Run” post, but there seems to be no comment section. Also, I’m looking for your Boston recap – how was the race??
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I’ve noticed that some other bloggers don’t have a comments section.
I’ll check it out, but it may be a system type of issue.
Some blogs are missing the like button but have the comment button.
The Boston race recap is still in draft mode.
I’ve had a head cold since the marathon, so between the race and the cold, my energy level has been low.
As I write I’m trying to decide if I should keep it short or write a short story.
But over all, the marathon was good.
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Tell us what you think