Early rehabilitation was applied according to a mobilization algorithm. Clinical parameters, the time that rehabilitation team used on early rehabilitation and progression in mobilization were recorded. The patients’ clinical conditions were graded according to the World Federation of Neurological Surgeons scale (WFNS). Results: Poor-grade patients (WFNS 3, 4, 5) (n¼12) received more rehabilitation (median 412min) than did good-grade patients (WFNS 1, 2) (median 240min). Mobilization to 60 of head elevation in good-grade patients began on day one after securing the aneurysm. Out-of-bed mobilization was possible on day three. Poor- grade patients were mobilized to 60 after two days and were out of bed on day seven. At discharge, 67% of poor-grade patients were mobilized to walking versus 78% of good-grade patients. No serious adverse effects to early rehabilitation were observed. Conclusions: Early rehabilitation in aSAH patients is feasible from the first day after securing the aneurysm. The rehabilitation content varied according to the patient’s clinical grade.