AimThis study aimed to evaluate the effects of Fried Frailty Phenotype Questionnaire (FFPQ) scores on patient‐reported postoperative outcomes.MethodsThis secondary analysis of a prospective observational study included 230 inpatients aged ≥65 years undergoing elective abdominal cancer surgery. The primary outcome was the Quality of Recovery‐15 score on postoperative days 2, 4 and 7. The secondary outcomes included disability‐free survival, defined as a 12‐item World Health Organization Disability Assessment Schedule 2.0 score of <16% at 3 months. The associations of the FFPQ scores, ranging from 0 (robust) to 5 (frailty), with the primary and secondary outcomes were assessed using multiple analysis.ResultsAfter confirming the linearity of the FFPQ score for the outcomes, multiple regression analysis adjusted for prominent factors showed that the FFPQ score was a significant factor influencing the decrease in the Quality of Recovery‐15 score on postoperative day 2 (β = −2.67, 95% confidence interval −5.20, −0.15), 4 (β = −3.54, 95% confidence interval −5.77, −1.30) and 7 (β = −3.70, 95% confidence interval −5.75, −1.65). The adjusted odds ratio of the FFPQ score for disability‐free survival postoperatively was 0.66 (95% confidence interval 0.49–0.90).ConclusionsPatients with higher FFPQ scores before elective major abdominal cancer surgery were likely to have lower postoperative Quality of Recovery‐15 scores and poor disability‐free survival. Geriatr Gerontol Int 2024; ••: ••–••.