The first runner to complete the Grand Slam was Tom Green, 35, of Maryland in 1986 in a combined time of 96 hours, 26 minutes, and 28 seconds.
In 2008, Western States was cancelled due to forest fires and the Arkansas Traveller 100 was run in its place.
[1] Starting in 2017, Old Dominion was once again added to the series and runners have to complete the Wasatch Front 100 Mile Endurance Run and three of the other four races to achieve the award.
In 2017 entry costs $80 and must be received before the start of the first race (Western States) in late June.
A list of these so-called "stealth" runners was maintained at https://web.archive.org/web/20120715180450/http://run100s.com/stealth.htm [7] On August 30, 2013, this page was removed, possibly out of concern that Nick Clark might set a course record without being officially recognized when Wasatch was to be held on Sept. 6-7, 2013.