At a minimum, how often should incident response testing occur?

Monthly testing exceeds the minimum required frequency and is not the standard baseline established by frameworks like NIST SP 800-61.

Quarterly testing is more frequent than the minimum requirement and is not the industry-standard baseline for incident response plan validation.

Testing only when an event occurs is reactive rather than proactive and conflates actual incident response execution with structured plan testing.

Semi-annual testing is not the recognized minimum standard; frameworks specifically require annual testing plus change-triggered testing, which semi-annual scheduling may miss.

NIST SP 800-61 and major security frameworks establish annual testing as the minimum baseline for incident response plans. Significant changes - such as new infrastructure, organizational restructuring, or major software updates - can invalidate existing procedures, so retesting after such changes ensures the plan reflects the current environment.