Most states stuck to the hard deadline of January 31st, 2016, but a few states are allowing those who signed up (but didn’t enroll) a few extra days to enroll.
If you signed up for the health insurance marketplace, but couldn’t finish the enrollment process in time, try finishing the process now. Only a few states, and not including HealthCare.Gov, are extending enrollment. Even if your state isn’t, you should still ensure the enrollment process has been completed correctly.
UPDATE FOR OPEN ENROLLMENT 2017: 42 states extended the December 15th, 2016 deadline to December 17th or 19th, 2016.