HealthCare.gov is still showing a full November 1 through January 15 enrollment period for 2027 marketplace coverage, even though a federal rule had been set to cut that window short. The calendar matters because a shorter period would have changed the point at which a person could no longer use the ordinary marketplace sign-up process for the coming plan year. Instead, the agency’s own current guide keeps January 15 as the closing date for the federal marketplace.
The reason is a court ruling, not a new congressional extension of the enrollment calendar. The 2025 Marketplace Integrity and Affordability final rule included a provision that would have shortened the federal window. In June 2026, the U.S. District Court for the District of Maryland vacated that provision in City of Columbus v. Kennedy. HHS and CMS filed a notice of appeal on July 16, but the live public calendar remains the one on HealthCare.gov: November 1, 2026 to January 15, 2027.
The Calendar on HealthCare.gov Is the Current Rule
The important distinction is between a rule that had been finalized and the schedule that is actually listed for consumers today. The shorter window was part of the 2025 rule, but the Maryland court’s decision removed that provision. HealthCare.gov’s dates-and-deadlines guide is the practical source for the current federal marketplace calendar, and it says open enrollment for 2027 coverage starts November 1 and ends January 15.
That leaves a 76-day stretch on the calendar, counting both the first and last dates, for the standard federal marketplace enrollment period. It also means that reporting a December 15 closing date for the whole season would be wrong. December 15 remains an important date inside the season because it separates the January and February coverage-start tracks, but it is not the end of open enrollment itself. The deadline for the ordinary 2027 marketplace window is January 15.
The source is deliberately specific about which calendar it describes. The article’s headline concerns marketplace coverage and the federal enrollment period displayed by HealthCare.gov; it does not say that every state marketplace follows an identical process or that a person can enroll outside the listed period without another enrollment route. The court ruling restored the longer federal window rather than creating an open-ended opportunity to enroll throughout 2027.
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Why the Court Case Changed the Dates
The enrollment dispute came out of the 2025 Marketplace Integrity and Affordability final rule. That rule would have made the federal enrollment period shorter. The litigation was filed as City of Columbus et al. v. Kennedy et al., No. 25-cv-2114-BAH, and Judge Brendan Hurson of the District of Maryland vacated the shorter-window provision in June 2026. “Vacated” matters here: the provision is no longer what sets the dates on the federal marketplace calendar.
The administration has not abandoned the dispute. The research record identifies a notice of appeal filed by HHS and CMS on July 16, 2026. An appeal can preserve a legal fight, but it is not itself a new enrollment calendar. The current public-facing schedule is still the evidence for what the agency says people can use this fall, and that schedule runs through January 15.
That sequence is why the title says the longer window “still runs” to January 15 rather than saying the court created a new benefit or permanently settled every future enrollment year. The court action affected the shorter provision for this plan year. The agency’s current dates page supplies the operative 2027 calendar. Future litigation developments would need a new agency calendar or court action before they could be reported as a change in the dates people see now.
Two Dates Inside One Open-Enrollment Period
The January 15 endpoint should not obscure the earlier December 15 split. HealthCare.gov says December 15 is the last day to enroll or change plans for coverage beginning January 1. Enrollment submitted after that date, but before the January 15 end of open enrollment, follows a later coverage-start schedule. The longer enrollment window gives the later group a route to sign up; it does not make every enrollment effective on the same day.
For anyone checking the calendar, the cleanest sequence is simple: November 1 opens the 2027 federal marketplace enrollment period; December 15 is the cutoff attached to a January 1 coverage start; January 15 closes ordinary open enrollment. The dates are not predictions, estimates, or a proposal. They are the dates HealthCare.gov listed when the research was checked on September 21.
The court history also explains why old coverage of the proposed shorter season needs an update. It accurately described what the 2025 rule would have done, but it no longer describes the calendar HealthCare.gov is publishing. The practical check is the agency’s live dates page, with the appeal noted as a continuing legal development rather than a reason to discard the current November-to-January schedule.
Keeping the Coverage Timeline Straight
A marketplace enrollment calendar and Medicare’s enrollment rules are separate systems, but both require readers to distinguish a general season from the date that changes a coverage outcome. The difficult part is often identifying which program, notice and deadline apply after a person moves from marketplace coverage into Medicare.
The Medicare Cost & Coverage Protection Kit is a 10-page kit with 51 state Medicare cost-help packs and a medication and cost tracker.
Compare the prior-authorization appeal steps in The Medicare Cost & Coverage Protection Kit.
This article was researched and drafted with the assistance of AI and reviewed by The Money Overview editorial team.
