Copenhagen begins its championship weekend on Saturday morning, and the compressed shape of it is the first thing worth noting. Three world titles are decided across two days: the road mile on Saturday, with the elite women away at 10:10 and the men at 10:30; the 5km on Saturday afternoon, women at 14:10 and men at 14:40; and the half marathon on Sunday morning, women at 09:10 and men at 09:45. A total of 496 athletes are entered, 270 men and 226 women, representing 85 member federations plus the World Athletics Athlete Refugee Team.
The scheduling has created a problem that did not exist when this championship was last staged. The inaugural World Athletics Ultimate Championship finished in Budapest on Sunday night, six days before the Copenhagen mile goes off. Several athletes have entered both, and the turnaround is short enough that form on the day will owe as much to recovery as to fitness. Jakob Ingebrigtsen is the headline case. He is entered in the 5km rather than the mile, which is the sensible choice of the two given what his legs have been asked to do this month, and he arrives having won the European 5000m title in August on his return from injury.
The women's half marathon is the weekend's deepest event and the one with the clearest favourite. Agnes Ngetich has spent 2026 rewriting road records at every distance she has touched, including a course record at the New York Mini 10K in June, and she comes to Copenhagen without an obvious rival at 21km. The men's races look more open. Jimmy Gressier, who shelved a planned one-hour record attempt in order to arrive here fresh, is among the strongest entries across the shorter distances, and the 5km in particular has the density of field that tends to reward whoever is willing to make the race honest from the gun.
The road mile remains the event most likely to produce a result that surprises the entry list. It is only in its fourth edition as a world title, the qualifying routes into it are looser than for the longer races, and a flat closed-road mile in mid-September rewards a specific kind of athlete: someone with track speed who has not spent the summer grinding through championship rounds. That description fits a good number of the entrants, and very few of them have a body of road-mile results to judge them on.
Around the elite races sit the mass fields that have become the point of this championship as much as the medals. Roughly 65,000 entrants are expected across the weekend's open 5km and mile events, run on the same closed city-centre courses as the championship races, with the half marathon course following the established CPH Half route. Copenhagen has form here: the city has hosted a world half marathon championship before and runs one of the fastest big-city halves on the calendar. Conditions in mid-September are usually cool and flat rather than dramatic, which is the sort of weather that makes the times worth arguing about afterwards.