For non-exempt projects, there is no grace period. Per Federal Regulations and MSU Policy, all research on the project must halt until you have secured continuing IRB approval.
Research activities include but are not limited to the following: recruitment, enrollment, advertisements, consent, interactions and interventions, and collection or analysis of data. Research may only proceed prior to securing continuing IRB approval if the IRB Chair finds that it is in the best interests of individual subjects to continue participating in the research interventions or interactions. Enrollment of new subjects cannot occur after the expiration of IRB approval.
For projects granted an Exempt Determination, further oversight by the HRPP is not required.