When does open enrollment start this year, and what actually changes once it does? Here are the ten things worth knowing before you shop.
Open enrollment decides when you can buy an individual or family health plan, and 2027 brings a real wrinkle: the deadline has moved twice in the last year. This guide sorts out what is actually true right now, plus a few paths that never depend on the calendar at all.
If you searched for when does open enrollment start because last year’s date sounded different from this year’s, you are not imagining it. The next item explains exactly what changed and why the answer settled back to the familiar schedule.
When Open Enrollment Actually Starts and Ends
For most states, open enrollment for 2027 plans runs November 1, 2026 through January 15, 2027.
That is the window set by the federal Health Insurance Marketplace, which covers the 38 states plus Washington, D.C. that use HealthCare.gov. Idaho starts earlier, on October 15, and Connecticut and Massachusetts both start on October 23. Outside of this window, you generally need a qualifying life event to enroll or switch plans.
Mark November 1 as the day to start shopping, wherever you live.
Why the Date Changed, Then Changed Back, for 2027
This year’s deadline has been unusually unstable, and it is worth knowing why.
A 2025 federal rule proposed shortening the 2027 open enrollment window to end December 15 instead of January 15. Several states adjusted their own deadlines to match. A federal court then vacated that rule in June 2026. In August 2026, CMS confirmed that HealthCare.gov states would keep the traditional November 1 to January 15 schedule.
If you heard about a shorter deadline earlier this year, that information is now out of date.
When Your Plan Actually Begins
The date you enroll changes the date your new plan takes effect.
- Enroll by December 15, 2026, and your plan starts January 1, 2027, with no gap from an employer plan or a prior year’s plan.
- Enroll between December 16, 2026 and January 15, 2027, and your plan starts February 1, 2027 instead.
That six-week gap is the single most common reason people end up scrambling for a January start date they did not plan for.
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What Happens If You Miss the Window
Missing open enrollment does not automatically mean going without a plan for the rest of the year.
A Special Enrollment Period opens a 60-day window after a qualifying life event. That includes losing a job, getting married, having a baby, or moving to a new state. Outside of a Special Enrollment Period, though, the marketplace itself is closed until next November.
That gap is exactly where the next two items on this list matter most.
Health Sharing Has No Open Enrollment At All
Health sharing plans do not run on the same calendar as marketplace plans.
Because health sharing plans are voluntary cost-sharing arrangements rather than regulated insurance, members can join at any point in the year. That makes health sharing one of the only practical options for someone who misses open enrollment and does not qualify for a Special Enrollment Period. Health sharing plans are not insurance, do not guarantee payment of medical expenses, and may limit sharing for pre-existing conditions, so the fit depends on your situation.
For a lot of people stuck between open enrollment windows, that year-round flexibility is the whole appeal.
HSA-Qualified Plans Are Still Available During Open Enrollment
A high-deductible health plan paired with a Health Savings Account is still a marketplace option during open enrollment, not a separate track.
Bronze and catastrophic plans are now automatically HSA-eligible, which was not always the case. If you want to contribute to an HSA next year, checking a plan’s HSA-eligible label before you enroll saves a January surprise.
It is worth comparing at least one HSA-qualified option before you commit to a lower-deductible plan.
Subsidies Changed for 2027, So Re-Shop Even If You Like Your Plan
This is the year to actually compare plans again, not auto-renew.
The enhanced premium tax credits that had reduced marketplace costs since 2021 expired at the end of 2025, and average premiums rose sharply heading into 2026. Auto-renewing into last year’s plan without checking current pricing is one of the most expensive mistakes you can make this open enrollment.
A five-minute comparison against a health sharing or HSA-qualified alternative can be worth far more than five minutes this year.
State-Based Exchanges May Run Longer
If your state runs its own exchange rather than using HealthCare.gov, your deadline may differ from the national date.
A number of state-based marketplaces extend their window into late January, and some go as late as January 31. Check your specific state exchange rather than assuming the federal November 1 to January 15 dates apply to you.
A few extra weeks can matter if you are still weighing your options.
Employer Open Enrollment Runs on a Different Calendar
If you get a plan through work, none of the dates above apply to you directly.
Employers set their own open enrollment windows, typically in October or November for a plan that starts January 1. That window is set by your employer, not the federal government, so check with HR rather than assuming the marketplace deadline applies. A Section 125 cafeteria plan carries one more catch. It must be in place before your employer’s open enrollment begins, or the FICA tax savings do not apply. Flag that for the business owner in your life, or for yourself if you run a small company.
Either way, the goal is the same: decide before your current plan simply rolls over.
A Quick Answer If You Only Remember One Thing
If someone asks you when does open enrollment start, the honest answer has two parts.
For most of the country, it is November 1, 2026 through January 15, 2027. For everyone else, it depends on your state’s own exchange and, if you get a plan through work, your employer’s own calendar. When in doubt, the safest move is to check your specific state rather than assume the national dates apply.
That one distinction avoids most of the confusion people run into every fall.
What to Gather Before You Start
A little preparation turns open enrollment from a scramble into a twenty-minute decision.
- Last year’s plan documents so you can compare this year’s premium and deductible against what you are paying now.
- An estimate of next year’s household income since it determines subsidy eligibility on the marketplace.
- A list of your regular medications and providers to check network and formulary coverage limits before you enroll, not after.
With those three things in hand, you can compare a marketplace plan, an HSA-qualified plan, and a health sharing plan side by side in one sitting.
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Frequently Asked Questions
When does open enrollment start for 2027 plans?
For most states, open enrollment starts November 1, 2026 and runs through January 15, 2027. Idaho starts October 15, and Connecticut and Massachusetts both start October 23, so check your state if you are unsure.
What if I miss open enrollment entirely?
You will generally need a Special Enrollment Period, triggered by a qualifying life event like losing a job or moving. Outside of that, a health sharing plan is one of the few options you can join at any time of year.
Do health sharing plans have an open enrollment period?
No.
Health sharing plans accept new members year-round, which is one of the main reasons people choose them after missing the marketplace deadline. They are not insurance, so the trade-offs are different from a regulated plan.
Can I still get an HSA-qualified plan during open enrollment?
Yes.
High-deductible plans, including Bronze and catastrophic options, are available on the marketplace during open enrollment. They are now automatically HSA-eligible, so you can shop for one the same way you would any other plan.
Why did the answer to when does open enrollment start seem to change this year?
A 2025 federal rule briefly shortened the window before a court vacated it in June 2026.
CMS confirmed in August 2026 that the traditional November 1 to January 15 schedule was back in place. Any shorter deadline you heard about earlier in the year no longer applies in most states.
What if my state runs its own exchange instead of HealthCare.gov?
Your dates may differ from the federal schedule.
Some state-based exchanges extend enrollment into late January, and a few go as late as January 31. Check your state’s own marketplace rather than assuming the national dates apply to you.
