Johansen finished 3rd in the 400 metres at the 2013 Veidekkelekene, and 4th in the 100 and 200 metres. At the 2013 Framolekene, he won silver in the 100 and 200 metres, and bronze in the 60 metres.
In September, he participated in the 2013 Norwegian Youth Athletics Championships [no], where he won bronze in the 200 metres in the U16 class. In the long jump, he finished 6th, and he came 4th in the 100 metres final.
2014
Outdoors, he participated in the Världsungdomsspelen, winning bronze in the 200 metres in the G16 class. He finished 8th in the long jump, and 4th in the 100 metres. He also competed in the 2014 Norwegian U20 Athletics Championships [no], one and a half months before turning 16. In the 100 metres, he was eliminated in the preliminary heats, with a time of 11.60, and in the 200 metres, he was eliminated in the semifinals, running 23.35.[2] In September, he participated in the 2014 Norwegian U18 Athletics Championships [no], where he finished 3rd in the 100 metres and 5th in the 200 metres.
His fastest outdoor sprints that season were 11.43 in the 100 metres and 23.11 in the 200 metres.
2015
He won silver in the 100 metres at the Baerum Tyrvinglekene. At the 2015 Världsungdomsspelen, he finished 3rd in the 100 metres, and 4th in the 200 metres. In July, he represented Norway at the 2015 World U18 Championships in Athletics in Cali, Colombia. There, he ran 22.05 in the preliminary heats in the 200 metres but did not advance to the finals.
At the 2016 Norwegian Indoor U18 Championships, he won the 60 metres in 7.06 and the 200 metres in 22.05. Both of these times were indoor personal bests.[3] He participated in the 2016 Norwegian Indoor Athletics Championships in March. In the 200 metres, he won his preliminary heat, with a time of 22.62, but did not qualify for the final.[4] In the 60 metres, he was eliminated in the semifinals, running 7.09.
In the outdoor season, he participated in the National Events at the 2016 Bislett Games, finishing 2nd in the 200 metres. He improved his times to 10.62 in the 100 metres at the Veidekkelekene, and to 21.34 in the 200 metres at Tyrvinglekene in June. He won bronze in both the 100 and 200 metres at the 2016 Världsungdomsspelen, where he also qualified for the 2016 World U20 Championships in Athletics after running 21.31.[5] At the World U20 Championships, held in Bydgoszcz, Poland, he posted a 0.3-second personal best in the 200 m of 21.00, despite a 1.2 m/s headwind.[6] In the semifinals, he finished 4th in his heat, and did not advance to the final.[7]
He participated in the 2017 Norwegian Relay Championships [no], where he placed sixth in the 4 × 100 metres relay representing IL Skjalg. Norway competed in the First League (second-best division) at the 2017 European Athletics Team Championships, and Hove Johansen participated in the 4 × 100 metres relay, finishing third. Norway placed sixth overall in the team competition, maintaining their position in the First League.[10] Johansen was selected to participate in the 2017 Nordic U20 Athletics Championships [no], winning silver in the 100 and 200 metres behind Henrik Larsson. He was also a member of the winning 4 × 100 metres relay team.
Norway competed in the First Division again at the 2019 European Athletics Team Championships, and Johansen finished seventh in the 200 metres, earning five points in the team competition. He also participated in Norway's 4 × 100 metres relay team, which finished 11th. Norway finished third place in the First Division, maintaining their league position.
At the 2020 Bislett Games (also called the Impossible Games), Johansen finished second behind Salum Ageze Kashafali. On 1 August, he set a personal record in the 100 metres at the Kuortane Games in Finland, with a time of 10.43 seconds. He won the 100 metres and 200 metres at the 2020 U23 Norwegian Athletics Championships, and he took gold in the 200 metres and silver in the 100 metres at the 2020 Norwegian Athletics Championships.
2021
Hove Johansen participated in the 2021 European Athletics Indoor Championships, but was eliminated in the preliminary heats of the 60 metres. Outdoors, he broke the 21-second barrier for the first time in June 2021, running 20.98 at the Night of Highlights, and he improved his personal best to 20.86 the next day in Lillehammer. He won two silver medals at the 2021 Norwegian Relay Championships [no], where IL Skjalg finished second in both the men's and mixed 4 × 100 m relays.
He represented Norway in two events at the 2021 European Athletics Team Championships, where Norway participated in the First League again. In the 200 metres, he finished in fourth place, and in the 4 × 100 metres relay, Norway finished in fifth place.[14][15]