Eligibility: BQ Finder lists U.S. full marathons that are course-certified and reviewed for Boston qualifying use. Starting with registration for the 2027 Boston Marathon, the B.A.A. applies downhill indexing to certified courses with 1,500+ ft net elevation loss: +5:00 for 1,500-2,999 ft, +10:00 for 3,000-5,999 ft, and no Boston qualifying eligibility for 6,000+ ft. Please submit only events that include a full marathon (26.2 miles). If certification is pending, we'll review and publish once verified.