Search for open enrollment 2027 and you will find two different answers. Some pages say the window closes in December; others say January. That contradiction is not a typo and it is not a state-by-state quirk - it is the visible residue of a court fight. A federal rule that would have shortened the enrollment window was struck down in mid-2026, and a great many guides written before that ruling are still online, still ranking, still describing a deadline that never took effect. Here are the dates currently in force for 2027 coverage, the one deadline most households actually need to hit, and what the ongoing appeal can and cannot change.
When is open enrollment 2027?
For 2027 individual and family coverage, open enrollment runs from November 1, 2026 through January 15, 2027 in the states that use HealthCare.gov. That is the same schedule the Marketplace has followed for several years running. November 1 is the first day you can select a 2027 plan, and January 15 is the last day to enroll or switch without a qualifying life event.
This window applies to coverage you buy for yourself - individual and family Marketplace policies. If your insurance comes through a job, your employer sets its own annual election period, and it frequently runs earlier in the autumn, so do not assume the two calendars match. And if you miss the Marketplace window entirely, your remaining route is a qualifying life event; our comparison of open enrollment and special enrollment periods explains which events open a mid-year window and which do not.
December 15 vs. January 15: the deadline that actually matters
The most useful thing to understand about this window is that it holds two deadlines, and the earlier one is the one most people care about:
- Enroll by December 15, 2026 and your 2027 coverage starts January 1 - a clean transition with no gap between plan years.
- Enroll between December 16, 2026 and January 15, 2027 and coverage generally starts February 1, which leaves you uninsured for the month of January.
- Selecting a plan is not the same as being covered. Carriers require the first premium to be paid before coverage activates, so leaving payment to the last minute can undo an application you submitted on time.
Why January is the wrong month to gamble on
Treating January 15 as the deadline is the most common and most expensive misreading of this calendar. A February 1 start date means deductibles, prescriptions and any scheduled procedure in January land on you at full price, with nothing accumulating toward the plan you are about to have. It also means a month with no in-network protection at exactly the point in winter when urgent care and emergency visits peak.
There is a second reason to move early: choosing well takes longer than choosing fast. Comparing networks, checking that your prescriptions sit on a plan's drug list, and weighing a lower premium against a higher deductible is real work - our guides to choosing a health insurance plan and to deductibles and out-of-pocket maximums walk through the trade-offs. Starting in November leaves room to get it right. Starting on January 14 does not.
What changed: the shortened window that was struck down
In 2025 federal regulators finalized the Marketplace Integrity and Affordability rule, which included a provision that would have compressed the annual enrollment window and ended it in December rather than mid-January. That provision was vacated by a federal judge in June 2026, which means it is not in effect and never governed a full enrollment season.
The reason this still causes confusion is simple: guidance published between the rule's release and the ruling described the shorter window as settled, and much of it was never updated. If you encounter a page stating that open enrollment for 2027 ends in December, or that the window is 45 days long, you are almost certainly reading a pre-ruling article.
The case is not over. HHS appealed the decision in July 2026, and oral arguments are scheduled for late October 2026. Based on reporting to date, the season most likely to be affected by the outcome is a later one rather than the window opening November 1, 2026 - but because the litigation is live, treat any date you read anywhere, including here, as worth confirming against HealthCare.gov or your state Marketplace before you rely on it. If you want the short version: plan around November 1 to January 15, aim for December 15, and verify before you act.
If your plan is being discontinued, doing nothing is the real risk
Most years, an enrollee who ignores open enrollment gets auto-reenrolled into the same or a similar plan. It is convenient, and it is also how people end up in a plan that no longer fits, at a price they did not agree to, with a network their doctor may have left.
The stakes are higher when a carrier stops offering individual coverage in a state or discontinues a specific plan, which does happen for some insurers and some markets each year. When a plan is going away, there may be nothing to auto-renew into, and the fallback is not guaranteed to resemble what you had. Anyone in that position needs to actively choose a 2027 plan during the window rather than waiting to see what arrives. Two practical habits protect you: read the notices your carrier and your Marketplace send in the autumn instead of filing them unopened, and log in to your Marketplace account in November to confirm what your plan is doing for 2027 rather than assuming it continues.
State-run Marketplaces can set their own dates
The November 1 to January 15 window covers the states served by HealthCare.gov. A number of states run their own Marketplaces, and they are permitted to set their own enrollment calendars - several have historically kept theirs open later than the federal platform, and a few open earlier.
So the dates above are the right default, not a universal rule. If your state operates its own exchange, confirm its published deadlines directly, because the extra weeks are only useful if they actually exist where you live.
How to use the window well
A short sequence covers most of what matters, and none of it requires waiting for November 1:
- Estimate your 2027 household income now, since premium tax credits are calculated from it and an outdated estimate is the most common reason a subsidy comes out wrong.
- List the doctors, hospitals and prescriptions you are unwilling to lose, and check each against any plan you are considering - networks and drug lists change between plan years even when the plan name does not.
- Compare total expected cost, not the monthly premium alone: the premium plus the deductible plus what you realistically expect to use.
- Note both dates on the calendar now - December 15 for a January 1 start, January 15 as the outside limit - and act on the first one.
- Confirm the current schedule for your state on HealthCare.gov or your state Marketplace before you finalize anything.
The bottom line
Open enrollment for 2027 coverage runs November 1, 2026 through January 15, 2027 on HealthCare.gov, and December 15, 2026 is the date that gets you covered on January 1. The shortened window you may have read about was struck down in court and is not in effect, though the appeal remains pending and the schedule is worth reconfirming before you enroll.
If subsidies are part of your decision, our overview of recent ACA subsidy changes covers how the credits work and what has moved recently. And if you would rather not sort through plan documents alone, a licensed agent can compare what is available in your area against your income, household and doctors at no cost to you - get a personalized quote before the December deadline, while every option is still open. Subsidy thresholds, plan availability and pricing are adjusted annually and vary by state, and enrollment dates for state-run Marketplaces differ, so confirm the exact figures and deadlines for your own situation with a licensed agent or tax professional.