The "Great Bay Half Marathon" is one of the most popular spring half marathons around! Kick off your spring with a run or walk on one of the most beautiful country roads in New Hampshire. This half marathon course travels over a designated scenic road along the Great Bay Estuary offering water views of Great Bay and idyllic mill town Newmarket. Three miles of this big one loop course travel over a maintained dirt road with historic farms and fieldstone walls it is truly a memorable course. Much of the course is blocked to traffic and this course is moderately challenging but the views are well worth it.