The 2018 Open Enrollment period is November 1, 2017 through January 23, 2018. If you apply during Open Enrollment, generally plans start as soon as January 1 of the next year (2018). 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.