The Happy Valley Half Marathon was created to bring you a breath-taking course, designed to showcase some of the most beautiful roads that New England has to offer, during peak Fall foliage. The Happy Valley experience only gets started at the finish line. Your achievement will be celebrated with breweries, food trucks and the enthusiastic support of the local running community. Speaking of community; this is an event that makes a positive impact year round as the Happy Valley Half Marathon & 5K has partnered with the Campaign for the Cooley Dickinson’s new Emergency Department to help make our community safer, happier and healthier.

The Happy Valley Half Marathon & 5K takes place during the peak of the fall season in beautiful Western MA. There is so much to do that we think you should come for the race and stay for the weekend! We have partnered with Newenglandchickadee to put together your itinerary for 48 hours in Western MA!

Please note that going forward there are no refunds, deferments and/or bib transfers. If the event cannot be held as planned due to COVID, inclement weather, or other unforeseen issues, you will be granted entry into a future race at no additional charge. We will honor any deferments that have already been requested. We will always honor our commitment to you, a quality race, and an experience you will remember.

Our Cause

Cooley is thrilled to again be the benefiting nonprofit for The 2025 Happy Valley Half Marathon & 5K

It’s a great opportunity to get your business in front of thousands of runners, their families, and over two thousand Cooley Dickinson employees. All sponsorship information and benefits are enclosed . There will also be advertising again this year with Newspapers of New England print, social, and digital. The breathtaking course is designed to showcase some of the most beautiful roads that New England has to offer during peak fall foliage.

Whether you run, volunteer, or become a sponsor, you will be supporting your own health and your community hospital. This is an event that makes a positive impact year- round, as the funds raised for the Happy Valley Half Marathon & 5K will benefit Transforming Emergency Care: The Campaign for the Cooley Dickinson Emergency Department to help make our community safer, happier, and healthier.