Since 2003, per Running USA State of the Sport Reports, the half-marathon has been the fastest growing standard distance in the United States with a 12.5 percent annual finisher growth rate, and moreover, from 2006-12, the number of 13.1 mile finishers grew a noteworthy 10 percent or more each year.

In 2013 that historic growth rate slowed as U.S. half-marathons had an estimated 1.96 million finishers (a new high) with a solid 6 percent increase from 2012 (1,850,000 vs. 1,960,000), but not nearly as impressive as the 24 percent record rise in both 2009 and 2010. Also, in the same 1,135 U.S. half-marathons for 2012 vs. 2013, there was a 1.6 percent finisher increase (1,528,938 vs. 1,552,696). By comparison, in the same 1,136 U.S. half-marathons for 2011 vs. 2012, there was a 5.1 percent finisher increase (1,522,637 vs. 1,599,838).

There were several factors why there was a single digit percent increase in U.S. half-marathon finishers. First, in 2013, like some U.S. marathons, several half-marathons were also impacted by weather cancellations including larger ones such as MetroPCS Dallas and St. Jude Memphis, both the same weekend in December. Second, the Rock 'n' Roll Marathon Series reported fewer finishers than the previous year. Third, there were only two inaugural half-marathons with more than 5,000 finishers compared to a record six in 2012 including two with more than 10,000 finishers. Collectively the aforementioned reduced the 2013 U.S. half-marathon count by an estimated 60,000 finishers.

Half-marathon fun facts snapshot:

  • Since 2000, the number of half-marathon finishers in this country has quadrupled (482,000 to 1,960,000) or an impressive increase of 307 percent.
  • For the first time in history, 61 percent of U.S. half-marathon finishers were females (approximately 1,196,000, a record), the highest proportion of any race distance.
  • Although their percent fell to 39 percent, there was also a record 764,000 male finishers last year.
  • Also, in 2013, there were 34 U.S. half-marathons with 10,000 or more finishers (second highest total ever). This data point has doubled since 2009 when there were 17 with 10,000-plus finishers, and in 2000, there was only one.
  • For the year, there were a total of 42 half-marathons that make up the Top 100 U.S. timed road race list with 15 of them from the Rock 'n' Roll Marathon Series.
  • The Nike Women's event in Washington, DC last April was the largest inaugural annual half-marathon ever with 14,478 finishers.
  • Since 2010, 13.1 miles has been the second most popular distance by finishers behind the 5K.
  • According to Running USA's 2013 National Runner Survey, the half-marathon distance is the favorite race distance by core runners nationwide (preferred 38 percent by men and 43 percent by women).
  • Last year, there were more than 2,100 active U.S. half-marathons (final road race numbers to be released in an upcoming State of the Sport Report).
  • Per our count, October hosted the most U.S. half-marathons (288), while January had the least (83) in 2013.
  • October 2013 also produced the most 13.1 mile finishers with more than 312,000 and July the least finishers with just under 53,000.

The following tables and lists display the demographics and astounding growth of the half-marathon over recent years.