Open enrollment for 2027 Marketplace health plans begins November 1, according to HealthCare.gov. People who want coverage to start on January 1 have until December 15 to sign up or change plans, even though enrollment itself stays open for another month after that.
The three dates on the HealthCare.gov calendar
HealthCare.gov’s dates and deadlines page lists the 2026-27 calendar in three steps. Open enrollment starts November 1, the first day anyone can enroll in, renew or change a health plan for the coming year. December 15 is the last day to enroll in or change plans for coverage to start January 1. January 15 is the last day to enroll in or change Marketplace plans for the year.
The agency’s glossary entry describes the same yearly period as November 1 to January 15. Between those two ends sits the date most people will care about, because it decides whether there is a gap in coverage on New Year’s Day.
So which deadline actually has to be met to be covered on January 1? December 15. Anyone who enrolls or switches plans from December 16 through January 15 gets coverage that starts February 1, once the first premium is paid. That leaves January uncovered for a person who waits, and it matters most for anyone who is leaving a plan that ends on December 31, someone who has an ongoing prescription or appointment, or a household that is switching because of price. People who are happy with their current plan and want it to continue should still look at their renewal notice, since plans change prices and benefits from year to year.
A health plan is only one of the household costs that can be covered in the new year, and most of the programs that help with the others have to be applied for separately. The Benefits Checklist scans 11 benefit programs and lists the 2026 income limits for each, so a household can see what else to ask about alongside its Marketplace plan.
Scan the Benefits Checklist for the 11 programs behind a January health plan →
Do not mix it up with Medicare dates
The Marketplace calendar is separate from Medicare’s. Medicare’s yearly fall period for changing Medicare Advantage or drug plans runs October 15 through December 7, and Medicare says a request has to reach the plan by December 7. Someone who has Medicare and is looking at a Marketplace plan for a younger spouse is working with two different calendars, and each one has its own cutoff.
What January 1 coverage depends on
HealthCare.gov’s page makes the January 1 date a plan-start date, not an end-of-enrollment date,. A person who signs up on December 20 has not missed open enrollment. That person has missed the cutoff for coverage to begin on January 1. The distinction affects out-of-pocket costs, because a month with no insurance is a month where any visit or prescription is billed in full.
Plans also depend on when the first premium is paid. HealthCare.gov ties the February 1 start for late enrollers to that first payment, so the date of the payment is part of the timeline and not just the date of the application.
The page does not set premiums, subsidy amounts or plan prices, and those figures are not part of the calendar. Households see them on the Marketplace site once they enter their own details, and they are the numbers to compare before choosing.
Work back from December 15
The free place to start is HealthCare.gov’s dates and deadlines page, which carries every date above. The practical way to use it is to count backward from December 15 and give the application a cushion of a week or two before that date, in case a document is missing or a verification step takes longer than expected.
Before November 1, gather the numbers an application asks for: household size, expected income for 2027, the name and policy details of any current plan, and whether anyone has an offer of coverage through a job. Write down the doctors and prescriptions that have to stay covered, so the plan comparison starts with what a household actually uses.
Then compare more than the monthly premium. The deductible, the out-of-pocket maximum and which doctors and drugs are included add up to what a year of coverage really costs. Mark December 15 on the calendar now, and put December 7 next to it if Medicare is part of the household’s plans.
December 15 covers the health plan, not the other bills
Even with a plan in place for January 1, heating, food and property-tax costs keep arriving, and the programs that offset them each have their own application. The Benefits Checklist covers 11 benefit programs with the 2026 income limits and includes a 50-state phone directory for finding the right office.
Get each program’s phone number from the Benefits Checklist before January 1 →
This article was produced with AI assistance and edited for accuracy against the sources linked above.
