Sudden gains (SGs) are defined as abrupt and significant improvements in mental health symptoms that occur between two psychotherapy sessions. Preliminary evidence suggests that SGs may be an important pattern of symptom reduction in the treatment of alcohol use disorder (AUD) (i.e., a steep between-session reduction in drinking or alcohol craving frequency or intensity) (Drapkin, Epstein, McCrady, & Eddie, 2015). The current study examined SGs within two randomized clinical trials (RCTs) testing female-specific cognitive behavior therapy (CBT) protocol for AUD (n=146). We tested a priori hypotheses about whether women's baseline depression, anxiety, and confidence to be abstinent while in a negative emotional state would predict attainment of SGs after attending sessions that addressed depression, anxiety, and emotion regulation (i.e., sessions five and six of the 12-session protocol). Data were collected at baseline, within treatment, and 15months after baseline. Results showed that women with high levels of depression and/or anxiety and low confidence to be abstinent in a negative emotional state at baseline were more likely to experience a SG (steep decrease in drinking) after sessions five and six (p=0.02). Further, among women with high levels of depression and/or anxiety at baseline, those who experienced both a SG in drinking after session five/six and had higher confidence to remain abstinent in a negative emotional state at the end of treatment reported lower drinking frequency at 9- but not 15-month follow-up [95% CI=(-2.65, -0.86)]. Findings support the value of providing interventions targeting mood and emotion regulation in AUD treatment for women.