When Is Health Insurance Open Enrollment? 2027 Dates

If you are asking when is health insurance open enrollment, the short answer for most people is this: the Affordable Care Act (ACA) Marketplace opens November 1 and runs to roughly January 15 in most states. But the “roughly” is doing real work this year. A 2025 federal rule tried to cut the window short, a court struck that rule down in June 2026, and enhanced subsidies expired at the end of 2025. So the date you enroll by matters more than it has in years.

Who this is for: You buy your own health insurance through the ACA Marketplace (HealthCare.gov or a state exchange), or you are helping a family member who does. You want the current dates and a clear way to choose a plan.

TL;DR: Open enrollment starts November 1 nationally. Enroll by December 15 for coverage that starts January 1; enroll after that (through your state’s deadline, often around January 15) for a February 1 start. Employer and Medicare open enrollment are separate windows with different dates.

What “open enrollment” actually means

Open enrollment is the yearly window when anyone can buy or change a Marketplace health plan without needing a special reason. During this window you can enroll for the first time, switch to a different plan, or renew. Outside of it, the door is mostly closed unless a specific life change qualifies you.

The Marketplace uses this fixed window on purpose. It keeps healthy and sick people enrolling on the same schedule, which is part of how ACA pricing works. Miss the window without a qualifying event and you typically wait until the next November — a long gap to go uninsured.

According to HealthCare.gov’s official dates and deadlines page, the standard window opens November 1 each year. Your specific end date depends on the state you live in, which is where the current uncertainty comes in.

The exact dates: 2026 coverage vs. 2027 coverage

Here is where a lot of older articles are now wrong. Dates changed, then a court changed them back for most states. Let’s separate the two plan years so it is clear which one applies to you.

Plan year 2026 (this window has already closed). For the roughly 30 states using HealthCare.gov, open enrollment ran November 1, 2025 to January 15, 2026, per the CMS 2026 Marketplace Open Enrollment fact sheet. Enrolling by December 15, 2025 gave a January 1, 2026 start; enrolling December 16 through January 15 pushed coverage to February 1, 2026.

Plan year 2027 (the one a 2026 shopper wants). Open enrollment starts November 1, 2026 nationally. The end date is the unsettled part. A 2025 federal rule (the Marketplace Integrity and Affordability final rule) would have shortened enrollment to close December 15 in HealthCare.gov states, but a federal judge vacated that rule in June 2026. As a result, most HealthCare.gov states are expected to revert to an end date near January 15, 2027 — though healthinsurance.org’s deadline FAQ notes HHS could still appeal, and several state exchanges run their own calendars ending anywhere from December 15 to January 31.

A state-by-state look at deadlines

Start dates are nearly uniform, but a few state exchanges open early and end dates diverge. Always confirm on your own state’s Marketplace before you rely on a specific day. The table below reflects the plan-year 2027 pattern described by healthinsurance.org’s deadline FAQ.

Detail	Most HealthCare.gov states	Notable state exceptions
Start date	November 1, 2026	Idaho & Pennsylvania: Oct 15, 2026; Massachusetts: Oct 23, 2026
Deadline for Jan 1 coverage	December 15, 2026	Same in most states
Final end date	Expected near January 15, 2027 (after June 2026 court ruling)	Some state exchanges end Dec 15-31; a few run to Jan 31
Coverage start if you enroll Dec 16 or later	February 1, 2027 (typical)	Varies by state exchange

The one date to circle regardless of state: December 15. In nearly every state, that is the cutoff for coverage that begins January 1. Miss it and, if your state still allows enrollment, your coverage most likely starts February 1 — leaving a one-month gap.

Special Enrollment Periods and qualifying life events

If you are reading this in, say, March and open enrollment is closed, you are not automatically stuck. A Special Enrollment Period (SEP) lets you enroll outside the normal window when you have a qualifying life event. HealthCare.gov generally gives you a 60-day window from the event to enroll.

Common qualifying life events include:

• Losing other coverage (job-based plan ends, you age off a parent’s plan, you lose Medicaid eligibility)
• Getting married or divorced
• Having a baby, adopting, or placing a child for foster care
• Moving to a new ZIP code or county with different plan options
• Changes in income or household size that affect your eligibility

Two things worth knowing. First, you usually need to confirm the event with documents, so keep records. Second, Medicaid and the Children’s Health Insurance Program (CHIP) do not use open enrollment at all — if you qualify by income, you can apply any time of year. Check the SEP rules on HealthCare.gov before assuming you have missed your chance.

Marketplace vs. employer vs. Medicare open enrollment

People often mix these up because they all use the phrase “open enrollment” and all happen in the fall. They are three separate systems with three separate calendars.

ACA Marketplace open enrollment is what this article covers: November 1 to roughly mid-January, for people buying their own coverage.

Employer (group) open enrollment is set by each employer, not by any federal date. It is typically a two-to-four-week window in the fall — often October or November — when you pick your workplace benefits for the coming year. If you have a solid job-based plan you are happy with, this is usually the window that matters to you, and you generally would not shop the Marketplace at the same time. One number the tax-minded should know: the IRS sets an annual “affordability” threshold for employer coverage. Per a Mercer summary of IRS Rev. Proc. 2025-25, that figure is 9.96% of household income for 2026, up from 9.02% in 2025 — the highest it has been.

Medicare open enrollment is entirely separate and runs October 15 to December 7 each year, for people already on Medicare who want to change Medicare Advantage or Part D drug plans. If you are 65 or older and on Medicare, this — not the Marketplace — is your window. Keeping these straight avoids a common and costly mix-up.

Why the subsidy cliff makes timing matter this year

Dates are only half the story right now. The enhanced premium tax credits that lowered ACA premiums for millions of people expired at the end of 2025. Analysis from KFF found that if those enhanced credits lapse, the average subsidized enrollee’s out-of-pocket premium payments would more than double — a 114% increase, from an average of $888 in 2025 to $1,904 in 2026.

Congress has debated whether to restore them: the U.S. House passed a three-year extension in January 2026, but the Senate had not approved it as of mid-2026, so the outcome remained unsettled. For background on the policy mechanics, the Congressional Research Service published an FAQ on the enhanced premium tax credit and 2026 exchange premiums. The practical takeaway: do not assume your renewal price is the same as last year. Actively log in during open enrollment, check your updated subsidy, and compare plans rather than letting your current plan auto-renew at a possibly much higher price.

Checklist: how to choose a plan during open enrollment

Once you know your window, use it well. Work through this checklist rather than defaulting to last year’s plan.

• Premium vs. deductible balance. A low monthly premium often means a high deductible (what you pay before insurance kicks in), and vice versa. Match this to how much care you expect to use.
• Check your subsidy first. Enter your estimated 2027 household income on the Marketplace to see your premium tax credit before comparing plans — it changes which plans are actually affordable.
• Confirm your network. Verify that your doctors, hospitals, and preferred pharmacies are in-network. Out-of-network care can cost far more or not count toward your deductible.
• List your prescriptions. Check each plan’s drug formulary so your medications are covered at a tier you can afford.
• Metal tier fit. Bronze plans have lower premiums and higher out-of-pocket costs; Silver, Gold, and Platinum step up premiums for lower cost-sharing. If your income qualifies you for cost-sharing reductions, those only apply to Silver plans.
• Total annual cost, not just premium. Add 12 months of premiums plus your realistic expected out-of-pocket spending. The cheapest premium is rarely the cheapest plan overall.

Worked example (illustrative numbers only): Say you compare two Silver plans. Plan A costs $250/month after subsidy with a $3,000 deductible. Plan B costs $190/month with a $6,500 deductible. Over a year, Plan A’s premiums total $3,000 and Plan B’s total $2,280 — a $720 premium saving on Plan B. But if you expect a surgery or ongoing care that would hit the deductible, Plan A’s lower $3,000 deductible could easily save you more than $720 in medical bills. If you rarely see a doctor, Plan B likely wins. Run your own real numbers this way before deciding.

For help building the budget room to absorb premiums and deductibles, see our guides on building a monthly budget that sticks and how much emergency fund you need.

Frequently Asked Questions

When does open enrollment start for 2027 health insurance?

In most states, November 1, 2026. A few state exchanges open earlier: Idaho and Pennsylvania on October 15, 2026, and Massachusetts on October 23, 2026, per healthinsurance.org’s deadline FAQ. Always confirm on your own state’s Marketplace.

Is the deadline December 15 or January 15?

It depends on what you want. December 15 is the cutoff for coverage starting January 1 in most states. Many states then allow enrollment through about January 15 for coverage starting February 1. A 2025 rule tried to end enrollment at December 15 outright, but a June 2026 court ruling vacated that, so most HealthCare.gov states are expected to keep the later January 15 end date — subject to a possible appeal.

Can I get health insurance outside of open enrollment?

Generally only if you have a qualifying life event — like losing coverage, marriage, a birth, or a move — which opens a 60-day Special Enrollment Period. Medicaid and CHIP are exceptions and accept applications year-round if you qualify by income. Check the SEP list on HealthCare.gov.

Why did my ACA premium go up so much for 2026?

A major factor is that the enhanced premium tax credits from the Inflation Reduction Act expired December 31, 2025. KFF projected that this would more than double the average subsidized enrollee’s premium payments (a 114% jump). The House passed a three-year extension in January 2026, but the Senate had not acted as of mid-2026, so check your updated subsidy during open enrollment rather than assuming last year’s price.

Is Medicare open enrollment the same as Marketplace open enrollment?

No. Medicare open enrollment runs October 15 to December 7 and is for people already on Medicare changing Advantage or Part D plans. Marketplace open enrollment (November 1 to about mid-January) is for people buying their own ACA coverage. They are separate systems with separate dates.

Bottom line: Mark November 1 as the opening bell and December 15 as your target if you want coverage on January 1. Then confirm your state’s specific end date, because 2027 deadlines are unusually fluid after the June 2026 court ruling. Most important this year: actively re-shop your plan and re-check your subsidy instead of auto-renewing — with enhanced credits expired, the price you paid last year may not be the price waiting for you now.