The 2026 Edmonton Marathon and half-marathon courses were mis-measured, forcing participants to run farther than the advertised distance [1, 2].
This error undermines the integrity of official race times, which are critical for professional athletes seeking qualifying marks and amateurs chasing personal records.
Course organizers discovered the mistake after the event concluded. The error resulted in a distance discrepancy of between 647 and 650 metres [1]. This mistake meant the marathon exceeded the official standard distance of 42.195 km [1, 2].
The additional distance had a varied impact on finish times depending on the pace of the runner. For professional racers, the error added between 90 seconds and two minutes to their final times [1]. Amateur runners faced a more significant delay, with some adding more than three to four minutes to their results [1].
Participants in both the full marathon and the half-marathon were affected by the measurement error [1, 2]. The mistake occurred during the course set-up phase, leading to the inflated distances [1, 2].
Runners expressed outcry over the discovery, as the extra distance occurred without prior warning. The discrepancy means that many athletes who believed they hit specific time goals actually performed better than their recorded finish times suggest [1].
“The error resulted in a distance discrepancy of between 647 and 650 metres.”
In competitive long-distance running, a few hundred metres can be the difference between qualifying for a major world event or failing to meet a standard. Because race certifications are strictly regulated, a measurement error of this size suggests a failure in the verification process, potentially affecting the official status of the race results for this year.
