To identify whether 6-month outcomes following hip arthroscopy for FAIS correlate with outcomes at minimum 10-year follow-up. Patients who underwent primary hip arthroscopy for FAIS from 2012-2013 were reviewed and included if they had 6-month and minimum 10-year follow-up. Patient-reported outcome (PRO) measures included Hip Outcome Score Activities of Daily Living (HOS-ADL) and Sports-Specific (HOS-SS) subscales, modified Harris Hip Score (mHHS), and Visual Analog Scales for Pain (VAS-P) and Satisfaction (VAS-S). Six-month and 10-year outcome scores were compared and the relationships between 6-month and 1-, 2-, 5-, and 10-year outcome scores were analyzed using Pearson correlation coefficients (r). 6-month scores and clinically significant outcome (CSO) achievement were then compared to 10-year CSO achievement and reoperations, including revision hip arthroscopy and total hip arthroplasty (THA) conversion, using logistic regressions and Fisher's exact tests. Sixty patients (60.0% female, age: 36.0±12.2 years) were included. mHHS, VAS-P, and VAS-S significantly improved from 6-month to 10-year follow-up (p≤0.021), while HOS-ADL and HOS-SS did not (p≥0.072). There were significant correlations between 6-month and 10-year scores for HOS-ADL (r=0.505), HOS-SS (r=0.592), and mHHS (r=0.362, p≤0.022 for all), as well as significant correlations between 6-month and 1-, 2-, and 5-year scores (p<0.014, for all). 6-month HOS-ADL, HOS-SS, and mHHS were all significantly associated with their respective 10-year PASS achievement (p≤0.044). Furthermore, 6-month HOS-ADL and mHHS were significantly associated with THA conversion (p≤0.041). Comparable 6-month and 10-year minimal clinically important difference (96.5% vs. 97.8%, p=1.000) and patient acceptable symptom state (85.2% vs. 87.5%, p=1.000) achievement for any PRO was observed. Following hip arthroscopy for FAIS, patients' 6-month HOS-ADL and mHHS scores were significantly associated with their 10-year PROs, PASS achievement, and THA conversion; although, correlation strengths decreased with increasing time from surgery. IV, case series.