The season began on 13 November 2011 with Wexford Youths and Castlebar Celtic drawing 2–2, Raheny United defeating Shamrock Rovers 5–0 and Stephanie Roche scoring a hat-trick as Peamount United defeated Cork Women's F.C. 6–1. On 12 February 2012 Roche scored six goals as Peamount United defeated Castlebar Celtic 13–0 at home. The return fixture on 15 April saw Peamount United win 9–0 with Roche scoring another hat-trick. The final round of games was played on 22 April 2012.[4]
Peamount United were the inaugural champions, finishing three points clear of second placed Raheny United. They also completed a league double by winning the WNL Cup, defeating Shamrock Rovers 1–0 in the final on 6 May 2012.[5] Roche was the league's top goalscorer with 24 goals in the league itself plus two in the WNL Cup.[6] She scored the winner in the WNL Cup final.[7]
Roche formed a "devastating" strike partnership with Sara Lawlor who contributed 15 goals to Peamount United's league success. Lawlor was named Player of the Season at the inaugural end of season awards ceremony, while Emma Hansberry of Castlebar Celtic won the Young Player of the Season.[8]