Purpose Healthcare workers must ensure effective infection prevention and control (IPC) to prevent nosocomial spread of SARS-CoV-2, the virus that causes COVID-19. This questionnaire study aims to evaluate Canadian critical care and emergency department nurses’ readiness to follow IPC guidelines in their workplace, and to understand their perceptions of trust in organizational preparedness, communication, and infection risk. Methods We adapted an internationally distributed survey for the Canadian context. This cross-sectional questionnaire, incorporating validated scales for items including institutional trust, was distributed by email to nurses via the Canadian Association of Critical Care Nurses and the Canadian Association of Emergency Physicians networks between 16 March and 25 May 2020. We evaluated intensive care unit and emergency department nurses’ adherence to IPC protocols, barriers and facilitators to IPC guideline adherence, and their level of institutitonal trust. Results Three hundred and nineteen nurses responded to the survey. There was higher trust in organizational preparedness among nurses who were older (B = 0.31, P < 0.001) and more experienced (F = 18.09, P < 0.001), and particularly among those with previous experience working in outbreak settings (F = 7.87, P = 0.005). Compared with those without experience working in outbreak settings, respondents with this experience reported higher levels of fear of becoming ill and fear of providing care for COVID-19 patients (χ 2 = 21.48, P = 0.002 and χ 2 = 12.61, P = 0.05, respectively). Older and more experienced nurses reported greater comfort with IPC skills and easier access to personal protective equipment. While the vast majority (96%) of respondents reported using masks and gloves, only 83% had access to isolation facilities for suspected or confirmed COVID-19 cases. Conclusion Canadian nurses had strong self-reported adherence to IPC measures and personal protective equipment use. There were high levels of trust in health system leadership to ensure protective measures are present and reliable. Trust was particularly high among older and more experienced nurses despite these populations reporting higher levels of fear of personal illness.