Mirroring its South Wales counterpart the Welsh Football League Division One, the 16-team division forms half of the second tier of the Welsh football league system and falls one level below the nationwide Welsh Premier League.
The season began 12 August 2017 and is scheduled to conclude on 31 March 2018.
Prestatyn Town were champions in the previous season and were promoted to the 2017–18 Welsh Premier League; they were replaced by both relegated teams from the 2016–17 Welsh Premier League, Airbus UK Broughton and Rhyl.
The bottom four teams from the previous season, Llanfair United, Mold Alexandra, Conwy Borough and Buckley Town, were all relegated to various third-tier district leagues for 2017–18.
[3] On 27 July 2017, Rhayader Town withdrew from the league, citing that their players were unwilling to commit to the extra travelling involved with promotion.