When to shop for health insurance (and why December is the worst time)

Last reviewed August 2026

Short answer: The best time to shop is September to October for research and the first two weeks of November to enroll. Search demand peaks in December because that is when the deadline for January 1 coverage falls, but the plans available in December are the same ones that were available in early November — the only thing that changes is how little time you have to check whether your doctors and prescriptions are covered.

Key takeaways

Demand peaks in December, driven by the deadline for January 1 coverage — not by better plans being available.
September and October are the best research months: next-year plan details exist and nothing is at stake yet.
Enrolling in the first two weeks of November leaves room to fix a network mistake.
A qualifying life event overrides the calendar entirely — you generally have 60 days.

What the search data shows

Health insurance shopping in the United States is one of the most seasonal consumer behaviours there is. Demand climbs from August, rises sharply through October and November as the enrollment windows open, peaks in December against the January 1 deadline, holds high into January, then collapses to an annual trough around May.

That curve is entirely deadline-driven. It tells you nothing about when plans are cheap and everything about when people are rushed. We publish it because no other comparison site tells you when to act — only what to buy.

The month-by-month calendar

Two federal windows create the shape of the year. Medicare Open Enrollment runs mid-October to early December. ACA Open Enrollment opens November 1 in most states, with a December deadline for coverage starting January 1 and a closing date that varies by state.

May to July — the trough. No deadline, no pressure, and the best time to read plan documents if you are simply learning.
August to September — next-year rates are filed and early plan detail appears. Build your list of doctors, prescriptions and expected costs now.
October — Medicare Open Enrollment opens. If you are on Medicare Advantage or Part D, this is your window to switch.
Early November — ACA Open Enrollment opens. Enroll here if you can. You keep the option to change your mind before the deadline.
December — peak demand and the January 1 deadline. Workable, but check networks before you optimise premiums.
January — final days of Open Enrollment in states with extended windows, then the door closes for most people.

What early shopping actually buys you

It does not buy a discount. Premiums are filed with state regulators and do not fluctuate with demand. What it buys is verification time, and verification is where the money is.

Three checks are worth more than any premium comparison: is each of your doctors in the network, is each of your prescriptions on the formulary and at what tier, and what is the out-of-pocket maximum. Each takes a few minutes in early November and is the first thing dropped when you are enrolling on the deadline.

When the calendar does not apply

A qualifying life event opens a Special Enrollment Period regardless of the month — commonly marriage, birth or adoption, a permanent move, loss of job-based coverage, or certain income changes. These usually give you 60 days, and missing that window is far more costly than missing an Open Enrollment date, because there may be no other route until the following year.

Medicaid and CHIP have no enrollment window at all. If you are eligible, you can apply on any day of the year.

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Sources

This page summarises published federal rules. Check the primary sources below for the current year's figures and deadlines.

Marketplace open enrollment and state-based exchanges — Centers for Medicare & Medicaid Services
Special Enrollment Periods and qualifying life events — HealthCare.gov (CMS)
When to sign up for Medicare — Medicare.gov (CMS)
Medicaid eligibility and expansion by state — Medicaid.gov (CMS)

Written and fact-checked in-house against the federal sources above, and reviewed each plan year. HealthQuotes AI is not a government agency and does not provide medical, tax or legal advice. See our editorial policy.

This guide was last reviewed August 3, 2026

What we check before publishing

Primary sources only: Every rule, deadline and dollar threshold is traced back to HealthCare.gov, Medicare.gov, CMS, Medicaid.gov, the IRS or a state insurance department — never to another blog.
Plan-year accuracy: Figures that change annually (income bands, out-of-pocket caps, enrollment dates) are re-verified before each Open Enrollment period and re-dated when a rule changes.
No price or availability claims: We never publish live premiums, plan counts or carrier availability. Those depend on your ZIP code, age, household and income, and are confirmed by a licensed producer or the official Marketplace.
Neutral routing: Coverage routes are ordered by eligibility, not by what pays us. Referral fees never change the premium you are quoted.
Plain-language review: Each page is read back for readability and for anything that could be mistaken for medical, tax or legal advice, which we do not give.

Spotted something out of date? See our full editorial policy — we re-date pages whenever a federal or state rule changes.

Frequently asked

Guide-specific questions first, then the same straight answers we publish on the homepage.

When is the best month to buy health insurance?

Research in September and October, then enroll in the first two weeks of November when Open Enrollment opens. Plans do not get cheaper later — you simply lose the time to check networks and drug coverage.

Why do most people shop in December?

Because the deadline for coverage starting January 1 falls in December in most states. Search demand peaks that month, which means it is also when carrier phone lines, broker capacity and enrollment sites are busiest.

Do health insurance prices change during Open Enrollment?

No. Premiums for the plan year are filed with state regulators before the window opens and do not move with demand. What changes is how much time you have to compare.

Can I buy health insurance outside Open Enrollment?

Only with a qualifying life event, which opens a Special Enrollment Period of usually 60 days. Medicaid and CHIP are exceptions and accept applications year-round.

Is HealthQuotes AI free to use?

Yes, HealthQuotes AI is completely free for consumers. We are paid by the licensed brokers and carriers we match you with, never by you.

Does HealthQuotes AI show live plan prices?

No. We show the plan structures you are typically eligible for based on your answers and US eligibility rules. Exact premiums, networks and availability are confirmed by a licensed agent or the official Marketplace after a full application.

Can I get health insurance if I'm self-employed?

Yes. Self-employed and 1099 workers can buy an ACA Marketplace plan, a private plan, or a high-deductible plan paired with an HSA. Many also qualify for premium tax credits based on their expected annual income.

What is the difference between a PPO and an HMO?

A PPO lets you see doctors outside your plan's network, usually for a higher monthly premium. An HMO costs less each month but requires you to stay in-network and often get a referral before seeing a specialist.

What is a deductible?

A deductible is the amount you pay for covered care each year before your insurance starts paying its share. A lower deductible usually means a higher monthly premium, and the reverse is also true.

Will I get spam calls after using this?

No. You choose whether to be contacted, the consent box is never pre-checked, and we only share your details with the licensed partners matched to your answers.

Is HealthQuotes AI a government website?

No. HealthQuotes AI is a private comparison service and is not affiliated with HealthCare.gov, Medicare, or any government agency.

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