4 running, swimming, cycling, and other events in Greenfield, Massachusetts
From big races to Saturday morning group runs—find running, swimming, cycling, and triathlon events and connect with the local endurance sports community.
Greenfield
4 events in Greenfield-
Sun, May 17, 2026 at 11:00 AMSee full details
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The Greenfield Recreation Department is excited for Mutts and Mayhem, an approximately 1.5 mile canine and companion obstacle course race! The race will feature fun and exciting challenges for both people and their furry friends and will leave spectators shouting “Oh My Dog”!
The event will be held at the Green River Swim Area on Sunday, May 17th beginning at 11:00am and will feature timed racing, local dog oriented vendors, prizes, and all around fun! Work your tail off with your dog as you traverse the river, jump over barriers, and go through hoops to compete for the quickest time.
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REGISTRATION
SMALL DOG (UP TO 40 LBS)
(Small Dog = up to 40 lbs) Conquer 20 obstacle stations along an approximate 1.5 mile course route with your leashed dog! Awards Ceremony to crown Champions. Reward your efforts with a post-race “rinse off”, enjoy a snack or treat, check out the vendors, take photos and celebrate your success!
Start Time: 11:00am
Price: $40.00 Pre-Registration by Friday, May 15th/ $50.00 Day of.
LARGE DOG (40+LBS)
(Large Dog = 40+ lbs) - Conquer 20 obstacle stations along an approximate 1.5 mile course route with your leashed dog! Awards Ceremony to crown Champions. Reward your efforts with a post-race “rinse off”, enjoy a snack or treat, check out the vendors, take photos and celebrate your success!
Start Time: Following Small Dog Start
Price: $40.00 Pre-Registration by Friday, May 15th/ $50.00 Day of.
RULES & SAFETY
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All dogs must be at least 1 year old on race day.
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Human participants must be at least 10 years old and each participant may only run 1 dog in the race.
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Your dog must be licensed, up to date on all vaccinations, and have no health complications that would prevent them from competing. *Vet records and dog licenses will not be required at the registration/ check-in table; however, we recommend having a photo of them on your phone in case an issue arises.
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All dogs MUST be kept on a leash at ALL times, including before and after the race. Please use a standard leash. No retractable leashes allowed. A harness rather than a collar is recommended!
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Dogs must be comfortable, confident, and secure around other dogs and people.
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You will have two chances to complete an obstacle. If you or your dog cannot complete an obstacle after your first attempt, you can go to the end of a line and try again or step to the side of the station and complete the designated penalty activity to continue. After a failed second attempt, you may move on to the next obstacle.
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If after attempting an obstacle and your dog refuses, NEVER force your dog to complete it. Instead, participants can opt to complete the designated penalty activity as a time penalty.
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Participants must clean up after their dogs. Waste receptacles will be located at obstacles for poop bag disposal.
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Sun, Aug 02, 2026 at 8:00 AMSee full details
The Greenfield Triathlon is the longest running triathlon in New England!
Situated in the heart of Franklin County, the Greenfield Triathlon course meanders through the picturesque back roads of Greenfield, passes through the Historic Eunice Williams Covered Bridge, and features swimming in our very own Green River.
Offering both International and Sprint distances for individual athletes as well as two- and three-person teams, the Greenfield Triathlon is great for both beginners and seasoned triathletes. A triathlon training program is offered Sundays leading up to the event. In Greenfield, our motto is “To Finish Is To Win!”
All race proceeds benefit the Greenfield Recreation Department. The Greenfield Triathlon has raised thousands of dollars to support programs and events for families within our community. We thank you for your continued support.
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Sun, Aug 23, 2026 at 7:00 AMSee full details
THE 2026 MARATHON IS FULL. THERE IS NO WAITLIST AND NO BIB TRANSFERS.
The New England Green River Marathon is one of the most beautiful races in New England. Starting in Marlboro, Vermont and following the course of the Green River through an 1870’s covered bridge, and ending with a finish-line celebration in the shade of maple trees at Greenfield Community College in Massachusetts. This USATF-certified (Certification MA18003JK) course has a net 1,400 foot drop over a rolling, downhill course that has seen many personal best and Boston qualifying times for well-trained runners. Choose below from either the regular entry, OR if you want to support the Connecticut River Conservancy by raising an additional $250, join the Stream Team! This funding will go directly to the CRC for their efforts to restore and advocate for clean water, healthy habitats, and resilient communities to support a diverse and thriving watershed.