Keough, 20, of Sandwich, finished third behind runner-up Daniel Holt and winner Kenneth Hanson, who edged his way to victory in a three-way sprint to the finish and stopped the clock at 59:32. The 28-mile race lapped City Hall Plaza in a short circuit, known as a criterium, and this year's Boston race was the series finale.
Jen McRae won the women's race with a time of 57:04.
Team Mountain Khakis powered by SmartStop secured the USA CRITS national teams title in Sunday's race. The team is packed with local racers, including Keogh and team captain Adam Myerson of Dorchester.
Keough entered the race with a slim lead in the series, and Myerson guided his team to protect Keough. Keough's teammates ensured none of his rivals escaped in any of the race's breakaway attempts, and as the final laps approached, they seized the opportunity to place Keough toward the front of the pack in a position to win.
"Our best chance to win the race was a sprint," Myerson said.
"It turned out to be a good season," Keough said. "Consistency all year round. I was there every race. I was up in the top position every race."
With the conclusion of the road season, Keough, a former junior cyclocross national champion, will switch to the hybrid road/off-road sport and race in the Great Brewers Gran Prix of Gloucester cyclocross race next weekend with brothers Nick and Jesse on team Champion Systems presented by Keough Cyclocross. Oldest brother, Nick, races for Kenda Pro Cycling Team.
The main contributors to The Buzz are:
- Steve Silva, Boston.com senior sports producer
- Gary Dzen, Boston.com senior sports producer
- Zuri Berry, Boston.com sports producer