Open Enrollment is the one window each year when most people can buy a marketplace plan for any reason. Outside that window, you generally need a qualifying life event to enroll or change coverage. Knowing how the calendar works keeps you from getting locked out.
The basic federal calendar
For HealthCare.gov states, Open Enrollment for plan year coverage has been November 1 through January 15 in recent years. Two key sub-deadlines exist within that window.
December 15. To have coverage start January 1, you usually have to enroll by mid-December. The exact day floats slightly.
January 15. Final day of Open Enrollment for HealthCare.gov in recent years. Plans selected after the December cutoff but before the final day start February 1.
HealthCare.gov publishes the dates for the current cycle on the Dates and Deadlines page. Treat the dates above as the historical pattern. The current year deadlines are what matter, and they could change with regulation or legislation.
State marketplaces often differ
State-based marketplaces sometimes run longer or shifted windows. A few examples of patterns I have seen:
California (Covered California) often extends Open Enrollment past the federal end date.
New York (NY State of Health) has historically used a similar window to the federal one but with its own announcements.
Washington, Massachusetts, New Jersey, Pennsylvania, and others can extend or modify dates.
The full current list of state marketplaces is on HealthCare.gov. If you live in a state-based marketplace state, the dates that govern you are the state ones, not the federal ones.
Special Enrollment Periods
Outside Open Enrollment, you need a Special Enrollment Period (SEP) to enroll or change plans. SEPs are triggered by life events. Common triggers include:
- Losing other health coverage (job loss, aging off a parent plan, ending COBRA, losing Medicaid)
- Getting married or divorced
- Having a baby, adopting, or placing a child for foster care
- Moving to a new ZIP code or county
- Gaining or losing citizenship or lawful presence
- A significant change in income that changes subsidy eligibility (in some states)
The SEP usually gives you 60 days from the event to enroll. Some events let you act 60 days before the event (a planned move, anticipated loss of other coverage). The marketplace verifies the event, sometimes asking for documents.
For more detail, see our Special Enrollment Period guide.
A year-round enrollment exception
If your household income is at or below 150 percent of the federal poverty level, the federal marketplace has offered a year-round SEP under recent rules. That window has been a major win for low-income shoppers. Confirm that it is still active on HealthCare.gov before you assume it applies.
What happens if you miss Open Enrollment
You wait. Unless you qualify for an SEP, you cannot enroll in a marketplace plan until the next Open Enrollment begins on November 1.
Three fallbacks during a coverage gap.
Medicaid. Medicaid is open year-round. If your income qualifies, apply right away. State expansion status matters. Our marketplace vs Medicaid article explains the difference.
CHIP. The Children Health Insurance Program is also year-round and covers kids in families that earn too much for Medicaid but not enough for unsubsidized marketplace plans.
Short-term plans. These are limited-duration plans with narrow coverage. They are not marketplace plans, do not cover all essential benefits, and can deny based on pre-existing conditions. They can be a bridge for a few months but are risky. See our short-term plan risks article.
A common scenario. Someone leaves a job in March and lets COBRA lapse because it is expensive. They want to enroll in marketplace coverage in July. Without an SEP, they cannot. The trigger they missed was the loss of job-based coverage, which gives a 60-day SEP. If they had applied within those 60 days, they could have enrolled. After 60 days, the window closed.
The lesson: when something changes that affects coverage, act fast.
Medicare has its own calendar
Medicare is not part of marketplace Open Enrollment. It has its own windows.
The Initial Enrollment Period (IEP) is the seven-month window around your 65th birthday: three months before, your birth month, and three months after.
The General Enrollment Period (GEP) runs January 1 through March 31 each year for people who missed their IEP and do not have a Special Enrollment Period.
The Annual Election Period (AEP) for Medicare Advantage and Part D runs October 15 through December 7.
The Medicare Advantage Open Enrollment Period runs January 1 through March 31, allowing one switch between Advantage plans or back to Original Medicare.
If you are aging into Medicare, our Medicare vs marketplace insurance article walks through the transition.
Tips for not missing the window
Put the dates on your calendar in October. Federal Open Enrollment opens November 1. Set a reminder for November 5 to start your application even if you do not finish.
Aim for the December cutoff for January 1 coverage. Plans selected late in Open Enrollment have later start dates, leaving a coverage gap.
If you have a major life event coming, plan ahead. Many SEPs let you act up to 60 days before a planned event.
Save your application credentials. Many people lock themselves out of HealthCare.gov or their state marketplace account because they cannot remember the password. The marketplace customer service line takes time during the November rush.
What to do next
Confirm whether you use HealthCare.gov or a state marketplace. The current list is on HealthCare.gov.
Open an account before November 1 if possible. You can save it and come back.
If you think you have an SEP, gather documentation now: termination letter from a former employer, marriage certificate, lease for the new address, birth certificate, divorce decree, or whatever applies.
For background, see our ACA marketplace overview and SEP guide.
Sources
Frequently asked questions
What is Open Enrollment?
Open Enrollment is the annual window when anyone eligible can buy, switch, or drop a marketplace health plan without needing a qualifying life event.
Does every state have the same dates?
No. The federal marketplace uses one schedule. State-based marketplaces can extend dates or shift them. Check your state marketplace directly.
What if I miss Open Enrollment?
You generally have to wait until next year unless you qualify for a Special Enrollment Period based on a life event.
Does Open Enrollment apply to Medicaid?
No. Medicaid enrollment is open year-round if you qualify.
Does Open Enrollment apply to Medicare?
Medicare has its own enrollment windows, separate from the marketplace. The Medicare Annual Election Period runs in the fall.
