Nils Allègre began skiing at the age of two and a half with his parents at the French resort of Serre Chevalier, and has been part of the France Ski Team since 2011. Having started out as a member of the Young Talent (category C) team, his first European Cup competitions (category B) followed before he joined the Men's World Cup Speed (alpine skiing) team, where he has been progressing for three seasons already. In 2018, Nils was named French Double Champion of Super-G and combined, then in 2019, French Vice Champion of Super-G. He also took 14th place at the Are World Ski Championships (Sweden) in Super-G, as well as 6th place at the Bormio Ski World Cup (Italy) in combined.

In 2020, the French skier took 7th place at the Hinterstoder World Cup (Austria) in Super-G and is 13th place in the global ranking for combined and 15th for Super-G. In 2021, Nils took the 7th place in Downhill in the FIS World Ski Championships in Cortina d’Ampezzo, Italy, and an impressive 2nd place in Super-G in the French National Championship in Châtel, France. He also took the 4th place in Super-G at the Garmisch-Partenkirchen Ski World Cup, in Germany, and holds the 14th place in the global Men’s Super-G World Cup 2021 ranking. In 2021/22, Nils will take part in his fifth season in the Downhill World Cup group.