The Gansu ultramarathon disaster unfolded during a widely anticipated 100 km race in a mountainous region of northwestern China. As the participants began their journey, they faced immediate difficulties due to sudden severe weather, which included freezing rain and hail, resulting in hazardous conditions on the course. While the event had attracted numerous competitors eager to challenge themselves, they were unprepared for the rapid descent in temperatures that would later lead to dire consequences.

Runners began to experience hypothermia as temperatures dropped to around 0 degrees Celsius (32 degrees Fahrenheit). Reports indicated that many athletes struggled against the weather, becoming disoriented and unable to continue the race. Rescue teams quickly mobilized as reports of distress emerged, but tragically, the harsh environment claimed the lives of 21 individuals. The incident not only underscored the physical and emotional toll such races can impose on participants, but it raised urgent concerns about safety protocols in organizing these types of extreme sports events.

In the aftermath, the tragedy ignited a significant debate within the running community as well as among event organizers. Questions regarding the adequacy of weather preparedness, athlete training, and emergency response efforts were raised. Further investigations highlighted the need for stricter regulations and enhanced safety measures for outdoor athletic events, especially those conducted in unpredictable or potentially dangerous environments. This disaster led to a re-evaluation of existing safety standards in ultramarathons across the globe, marking a critical point for the future of the sport.