Background: Older adults with GI cancer often experience poor surgical outcomes, yet little is known about their PROs, such as physical function, quality of life (QOL), and physical and psychological symptom burden. Methods: As part of a randomized trial of perioperative geriatric care, we prospectively enrolled adults age ≥65 with GI cancer planning to undergo surgical resection. We asked patients preoperatively to self-report their physical function (activities of daily living [ADLs] and instrumental ADLs [IADLs]), QOL (EORTC QLQ-C30), symptom burden (Edmonton Symptom Assessment System [ESAS], scores > 3 considered moderate/severe [mod/sev]), depression symptoms (Geriatric Depression Scale [GDS], scores > 4 represent a positive screen for depression), and comorbidities. We used regression models to explore relationships among PROs and clinical outcomes (receiving planned surgery, postoperative complications [Clavien-Dindo], hospital readmissions within 90 days, and survival). Results: From 9/2016 - 4/2019, we enrolled 160 of 221 (72.4%) patients approached (median age: 72, range: 65-92). At baseline, most (53.1%) reported at least one comorbidity and required assistance with ADLs (94.8%) and IADLs (52.3%). Patients reported an average of 2.56 mod/sev ESAS symptoms, and 27.7% screened positive for depression. For surgical outcomes, 137 patients (85.6%) underwent planned surgery, and 99 (72.2%) of these had at least one postoperative complication. Greater independence with ADLs was associated with undergoing planned surgery (OR = 1.21, P = .02), lower risk of complications (OR = 0.81, P < .01), and improved survival (HR = 0.87, P = .02), but not readmissions. Greater independence with IADLs was associated with undergoing planned surgery (OR = 1.30, P = .03) and improved survival (HR = 0.73, P < .01), but not other outcomes. Higher baseline QOL was only associated with lower risk of postoperative complications (OR = 0.97, P = .04). Higher depression scores were only associated with worse survival (HR = 1.13, P = .02). Higher baseline symptom burden predicted for shorter time to readmission (HR = 1.13, p = .03). Patient-reported number of comorbidities was associated with shorter time to readmission (HR = 1.49, p = .03) and higher risk of complications (OR = 1.70, P = .03). Conclusions: Older adults with GI cancer often have baseline functional limitations and a high symptom burden, all of which are associated with worse clinical outcomes. Future work should study whether addressing preoperative PROs could improve older patients’ surgical outcomes. Clinical trial information: NCT02810652..