On 1st March entries opened. Deadline is 14th May.

In the Mass start, Middle distance and Sprint each Federation may enter up to a further 2 women and 2 men who qualify for the Women U23 and Men U23 classes respectively. No U23 classes are offered in the Long distance.

Women and men born 1999 or later are entitled to compete in the Women U23 and Men U23 classes respectively. They compete simultaneously in the WMTBOC Women’s and Men’s classes and are treated in all respects as competitors in those classes except that their results and scores are also listed separately in Women U23 and Men U23 lists.

The Long distance and Sprint also count in the Young Guns World Series M20 and W20 (Junior) classes.