Boston- BAA Half

Held in early November, this out and back course starts at Boston's Franklin Park (one of the oldest in USA) and runs along the Emerald Necklace Park system. The first half of the course is more downhill while the latter half has a lot of rolling hills that gets tough around mile 11 onwards.
Registration opens and closes in early July, field size is limited to 9000 entrants. Registration for BAA distance medley - that includes 5K in April, 10K in June and HM in November- opens in the 3rd week of January and limited to first 3000 registrants.