Junior career

Horgmo spent much of his junior career under the stewardship of former Grand Prix rider Kenneth Gundersen. He claimed his first national title in 2013 in the 85 class and in addition competed in the European Motocross Championship.^[3] In 2014, he made his debut in the FIM Motocross Junior World Championship in the 85cc class, picking up three points.

Horgmo moved into the EMX125 class of the European Motocross Championship in 2015. After scoring points sporadically throughout the season, Horgmo was able to secure his first top-ten race finish at the last round of the season, with seventh in race two. In the same season he was able to win the 125 national championships of both Norway and Sweden. In 2016, Horgmo began to move himself up the ranks of the EMX125 championship as the season progressed, including scoring a second position in race two in Great Britain. He picked up an injury at the following round which saw him end the season on the side-lines.^[4]

2017 would be Horgmo's last season on a 125 and saw him ride for the CreyMert Racing KTM team. This would be a standout season for Horgmo, where he picked up three overall podiums in the EMX125 class of the 2017 European Motocross Championship, which included his first overall win at the French round.^[5] In addition to this, Horgmo was able to be one of the leading competitors in that years FIM Junior World Championship, where a second place in race two was enough for him to take home the bronze medal. After these performances, he was called up to ride for Norway at the 2017 Motocross des Nations, where the country was unable to qualify for the main races.

250 career

Horgmo extended his contract with the CreyMert KTM team for 2018 and 2019 seasons.^[6] The 2018 European Motocross Championship would be his first in the EMX250 class. After two-second place moto finishes throughout the season, Horgmo ended the campaign by finishing second overall at the final round at Assen, behind Jett Lawrence. Tenth in the final standings was coupled with him becoming Norwegian Champion in the MX2 class.

In the 2019 European Motocross Championship, Horgmo had a strong start in EMX250, with two top-three race finishes in the first two rounds. He then missed the next three rounds due to a broken jaw sustained in a Dutch Masters of Motocross event.^[7] Once he recovered, he made his debut in the MX2 class of the 2019 FIM Motocross World Championship in Czech Republic, scoring a tenth place in the second race. He then returned to the EMX250 class in Belgium, finishing second overall before choosing to miss the last round to make his second MX2 world championship start in Sweden. Horgmo rode one final Grand Prix in 2019, in Turkey, riding this time for the Marchetti Racing KTM team. Following this, he made his second appearance for his country at the 2019 Motocross des Nations. The Norwegian team had one of their best performances on record, finishing twelfth overall, with Horgmo finishing fourth best MX2 rider in the main races.

After guesting with them at the end of 2019, Horgmo signed for Marchetti Racing KTM for his full-time MX2 World Championship debut in 2020.^[8] It proved to be a tough season for Horgmo, where he struggled to adapt to the team and picked up three top-ten races finishes on the way to eighthteenth in the final standings. After splitting with the Marchetti team, he took up the option to drop back into the EMX250 class of the European Championship for 2021 European Motocross Championship.^[9] This would prove to be Horgmo's most successful European Championship season, with him battling eventual champion Nicholas Lapucci from the first round. Six overall podiums, three race wins and two overall wins were achieved along the way finishing in the runner-up spot. In addition, he made three wildcard appearances in the MX2 class of the 2021 FIM Motocross World Championship, with a best race finish of twelfth.

After such a strong season, Horgmo signed for the F&H Kawasaki team for a full-time return to the MX2 class in the 2022 FIM Motocross World Championship.^[10] He carried his good form into the new World Championship season, finishing consistently in the top-ten across the first three rounds, before getting his first race top-three in the second race at the Portuguese round. Two rounds later he secured his first overall podium by finishing second overall in Latvia.^[11] After finishing fourth in the final standings, Horgmo made his fourth appearance for Norway at the 2022 Motocross des Nations, helping his country finish thirteenth. 2023 would be Horgmo's last season in the MX2 World Championship due to the under-23 rule. He started the season strongly with a second place in race two in Argentina. Despite consistently finishing in the top-ten he struggled to push up as high as he had in the previous season until the Swedish round where he was able to take the qualifying race win. Two rounds later, in Turkey, he was able to take his first World Championship race win and secure his second ever overall podium. After a final championship placing of seventh, Horgmo made his fourth appearance for Norway at the Motocross des Nations.

Motocross des Nations

Year	Location	Nation	Class	Teammates	Team Overall	Individual Overall
2017	Matterley Basin	NOR	MX2	Hakon Engan Karlsen Sander Agard-Michelsen	24th	N/A
2019	Assen	NOR	MX2	Håkon Fredriksen Henrik Wahl	12th	4th
2022	Red Bud	NOR	MX2	Cornelius Tøndel Håkon Østerhagen	13th	14th
2023	Ernée	NOR	MX2	Cornelius Tøndel Håkon Fredriksen	16th	15th

FIM Motocross World Championship