On 20 October, Aalesund secured both promotion and league title with three games to spare by winning 1–0 away over Tromsdalen.[3] The same day, Tromsdalen were the first team to be relegated as their defeat coincided with a victory for Strømmen. On 2 November, Sandefjord secured promotion to the first tier with one match to spare after their 1–0 win over Jerv at Komplett Arena.[4] On the same day, Skeid were the second team to be relegated as their draw against Notodden meant that survival was out of reach before the ultimate round.
^Harðarson was initially appointed as caretaker on 3 April 2019, and as interim head coach for the rest of the season on 10 July 2019. Harðarson was appointed as permanent head coach on 23 October 2019.
The 3rd to 6th placed teams took part in the promotion play-offs; these were single-leg knockout matches. In the first round, the fifth-placed team played at home against the sixth-placed team. The winner of the first round then met the fourth-placed team on away ground in the second round. The winner of the second round then met the third-placed team on away ground. The winner of the third round advanced to play the 14th-placed team in Eliteserien over two legs in the Eliteserien play-offs for a spot in the top-flight next season.
The 14th placed team took part in a two-legged play-off against the winners of the 2. divisjon play-offs to decide who would play in the 2020 1. divisjon.