When Is Open Enrollment for Health Insurance in 2027? Dates and Deadlines

A dated timeline for 2027 open enrollment

Why the 2027 window is shorter than you might remember

If you've shopped for Marketplace coverage in recent years, you may recall a window stretching all the way to January 15, with a February 1 coverage start option if you enrolled in that final stretch. That changed under a federal rule finalized in mid-2025, which shortened the open enrollment period specifically starting with the 2027 plan year. The stated goal was tightening eligibility verification and reducing improper enrollments, alongside the shorter calendar window itself.

The practical result: in federal Marketplace states, your real deadline moved up by an entire month compared to what you may be used to, and the safety net of a later, delayed-start enrollment option is gone. This is exactly the kind of change that catches people off guard if they're going on memory from a previous year rather than checking the current deadline directly.

Does your specific state follow the federal dates, or its own?

Whether November 1 through December 15 applies to you specifically depends on whether your state uses the federal HealthCare.gov Marketplace or runs its own state-based exchange. Roughly 29 to 32 states use HealthCare.gov and follow the federal schedule above. The remaining states, plus the District of Columbia, operate their own exchange (examples include California, New York, Pennsylvania, and Massachusetts, among others) and have some flexibility in setting their own dates.

What happens if you miss the open enrollment deadline?

Missing your deadline doesn't necessarily mean you're completely out of options for 2027, but it does mean your path forward looks different.

• Qualifying Life Events open a Special Enrollment Period: losing other health coverage, getting married, having a baby or adopting a child, moving to a new coverage area, or certain income changes can all trigger a Special Enrollment Period, typically giving you 60 days from the event to enroll in a Marketplace plan outside the normal window.
• Medicaid and CHIP remain available year-round: unlike Marketplace plans, Medicaid and the Children's Health Insurance Program accept applications on a rolling basis all year, regardless of the Marketplace's open enrollment schedule, for anyone who meets their state's income and category requirements.
• Short-term health insurance can bridge a true gap: if you've missed your deadline and don't qualify for a Special Enrollment Period, a short-term plan can provide coverage until the next open enrollment window, though these plans typically exclude pre-existing conditions and don't count as ACA-compliant coverage.
• Otherwise, you'll generally wait for next year: if none of the above apply, the realistic outcome is waiting for the next annual open enrollment period to get ACA-compliant coverage, which is exactly why marking your specific deadline in advance matters so much this particular year.

It's also worth knowing that one specific special enrollment pathway, a monthly, year-round opportunity for people with household income below 150% of the federal poverty level, was repealed under the same federal rule that shortened the overall enrollment window. If you've relied on that option in a previous year, it's no longer available, making your standard deadline even more important to track precisely this time.

A note on Medicare and employer coverage

If you're asking about health insurance open enrollment more broadly, it's worth knowing that Medicare and employer-sponsored coverage each run on their own separate calendars, distinct from the ACA Marketplace dates above. Medicare's annual Open Enrollment Period runs October 15 through December 7 each year, letting existing Medicare beneficiaries switch between Medicare Advantage, Medicare Supplement, and Part D plans. Employer-sponsored open enrollment windows are set individually by each employer, typically happening sometime in the fall, and don't follow the Marketplace's November 1 start date at all. If you're comparing options across more than one of these categories, it's worth tracking each deadline separately rather than assuming they align.

It's also worth remembering that traditional, employer-sponsored coverage and an ACA Marketplace plan work on fundamentally different timelines for a reason: an employer plan's enrollment window is set by that specific employer's own benefits calendar, while the Marketplace window is set by federal (or state) regulation and applies regardless of your employment situation. If you're weighing a Marketplace plan against your employer's offering for 2027, confirming both deadlines side by side, rather than assuming one informs the other, avoids an unnecessary scramble in either direction.

A quick checklist before your 2027 deadline

• Confirm whether your state uses the federal HealthCare.gov Marketplace or its own state-based exchange, since your actual deadline depends on which one applies to you.
• If you're in a federal Marketplace state, treat December 15, 2026 as a hard deadline, since no delayed February 1 start option remains available this year.
• If you're in a state-based exchange, check that state's specific published deadline directly, rather than assuming either the federal date or a generic "extended" date applies.
• If you expect to experience a qualifying life event (new job, move, marriage, new child) near your deadline, understand how a Special Enrollment Period's 60-day window would apply to your specific timing.
• If you're uncertain whether a plan change, Medicaid eligibility check, or employer coverage decision affects your Marketplace choice, compare all of your actual options together rather than deciding on Marketplace coverage in isolation.

For the authoritative, non-commercial sources on this topic, HealthCare.gov publishes the official 2027 Marketplace enrollment dates and your specific state's exchange information directly, and the Centers for Medicare & Medicaid Services (CMS) publishes the official final rule establishing these 2027 enrollment period changes.

Frequently asked questions about 2027 open enrollment dates

Have a question that isn't answered below? Our full health insurance FAQ page covers more, and our blog has deeper guides on specific coverage topics.