Currently applied cognitive tests for assessing the risk of post-operative delirium require time and specialised medical staff, in addition to the patients' mental strain. We investigated the four-point scoring Clock-Drawing Test (CDT-4) as a preoperative independent predictor for post-operative delirium. A total of 100 consecutive patients aged over 65years admitted for accidental hip fracture were assessed for delirium using the Confusion Assessment Method Scale. The cognitive function was rated with mini-mental state examination, Montreal Cognitive Assessment Scale (MoCA), and CDT-4. Descriptive statistics were performed, and a logistic regression model for post-operative delirium was applied. Out of the 100 enrolled patients 98 underwent hip repair surgery and 65 (66%) had post-operative delirium, with 24 (42%) incident cases. The median (IQR) ages were 78 (72-83) and 84 (80-87)years for the non-delirium and post-operative delirium groups, respectively. The logistic regression concluded with age and CDT-4 as independent preoperative predictors, while controlling for gender, pre-surgery delirium, MoCA visual, and MoCA attention: OR 1.32 [95% CI (1.099-1.585); p=0.003] for age; OR 0.153 [95% CI (0.033-0.719); p=0.017] for CDT-4. Employing CDT-4 as a bedside assessment of delirium risk may help to preoperatively stratify and prioritise the patients for preventive perioperative care in a timely manner.