One of Massachusetts’ new ultramarathons in 2017 won’t return for a second year.

The Fall 50 Cape Cod, which made its debut in the Bay State last year on Sept. 30, will not take place in 2018. Organizers of the event made the announcement on the Fall 50 Facebook page.

“We will not be producing Fall 50 Cape Cod again in 2018. Low turnout along with concerns about heavy motor vehicle traffic along the route forced us to discontinue this event. We hope to launch Fall 50 New England in a different part of that region in the next few years,” the organizers wrote.

When organizers launched the Fall 50 Cape Cod ultramarathon and relay, they were optimistic that the event could start with small, humble beginnings and grow into a large New England classic.

They’d seen it play out that way before with the launch of the original Fall 50 in Door County, Wisc. What began as a small event in 2006 rapidly grew to an annual sold-out affair with 500 relay teams and dozens of solo runners. After 11 years of putting on the single event in Wisconsin, they branched out in 2017 to add a second location – this time on Cape Cod in Massachusetts. The Door County race once again sold out, while the new Cape Cod race attracted a handful of solo runners and a few dozen relay teams.

The relay option proved to be the most popular, with two teams of two and 26 teams of between three and five runners completing the 50-mile relay. Seven solo runners started the race, and six finished. The course began at White Crest Beach and took runners along the Cape Cod National Seashore with numerous miles on the Cape Cod Rail Trail and Old Colony Rail Trail before ultimately finishing on the sand at Craigville Beach in Barnstable. Mark Ste-Marie of Charlestown, Mass., was the men’s winner, while Meg Capodanno of Fairfield, Conn., was the women’s winner.

While race organizers seek another New England venue to bring back the race in the future, the Door County event rolls on. The 13^th annual Fall 50 Door County event will take place on Oct. 20, 2018. Registration for the team relay option opened April 2 and has already sold out. Registration for solo runners opened on April 3, and spots in the field are still available. Additionally, a new Fall 50 – to take place in Traverse City, Mich. – was slated to begin in 2018 but has been postponed until 2019.