The 2017 Open Enrollment period ended January 31, 2017 and the next open enrollment period has not yet been announced. If you apply during Open Enrollment, generally plans start as soon as January 1 of the next year. In general, open enrollment is the only time of year when you can purchase or change insurance plans for any reason. However, you may be allowed to enroll outside of open enrollment if you experience certain life events, such as losing your current insurance. If you qualify for MassHealth, or for a ConnectorCare plan, you may enroll at any time during the year.