This study aimed to investigate whether tracheostomy timing in patients undergoing cardiac surgery had an impact on outcomes. Retrospective, observational study. Single-center university hospital. Patients requiring tracheostomy among a total of 961 patients who underwent cardiovascular surgery via a median sternotomy from January 2014 to March 2021. Early versus late tracheostomy. During the study period, tracheostomy was performed in 28 patients (2.9%). According to tracheostomy timing, postoperative day seven was chosen as the cutoff to define early (≤seven days) and late (>seven days) tracheostomy. Patients in the early-tracheostomy group had a significantly shorter ventilation time after tracheostomy compared with the late-tracheostomy group (p=0.039), and early tracheostomy resulted in a reduction in total ventilation time (p=0.001). The incidence of pressure ulcers was significantly lower in the early-tracheostomy group compared with the late- tracheostomy group. There was a higher tracheal tube removal rate in the early-tracheostomy group compared with the late-tracheostomy group (p=0.0007). The one-year survival rate in the early- and late-tracheostomy groups was 65% and 31%, respectively. The long-term mortality rate was significantly lower in the early-tracheostomy group compared with the late- tracheostomy group (p=0.04). Early tracheostomy (<seven days) may provide better clinical outcomes, with lower mortality and morbidity rates, when patients are judged to require at least seven days of ventilation after cardiovascular surgery.