US ACA open-enrollment calendar (2027 coverage, by state)

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Complete 51-jurisdiction panel (50 states + DC) of the Affordable Care Act Marketplace open-enrollment window for 2027 coverage, transcribed 2026-10-01 from healthinsurance.org's state-by-state deadline tracking (Aug 2026, per-marketplace citations), CMS's written confirmation, and official state pages. 29 states use HealthCare.gov (Nov 1, 2026 – Jan 15, 2027); 21 states + DC run their own marketplaces with early starts (ID Oct 15; CT/MA Oct 23), an early close (ID Dec 15), and extensions to Jan 23 (MA), Jan 29 (VA), Jan 31 (CA/DC/NJ/NY/RI — RI corrected from a stale Dec 31 via HealthSource RI's official page). Includes the January-1-effective deadline per state and documented urgency features for lead scoring. Caveat: the 2025-rule litigation is on appeal (oral arguments late Oct 2026), so windows could change. Enrollment dates are facts (Feist v. Rural); this compilation is original -> commercial_use=yes. Join on geo_code (ISO 3166-2) or state_abbr for enrollment-urgency lead scoring, subscription churn/renewal timing, and outreach planning.

Source: US ACA open-enrollment calendar intelligence (2027 coverage)
Rows: 51
Columns: 17
Source cadence: Yearly
Last refreshed: Oct 1, 2026
Theme: health

Column	Type	Description
geo_code	string	ISO 3166-2 jurisdiction code (US-AL .. US-WY, US-DC); primary join key.
country_code	string	ISO alpha-3 country code: USA for all rows.
state_abbr	string	USPS postal abbreviation.
state_name	string	Full state / district name.
marketplace_platform	string	federal (HealthCare.gov) or state-based.
marketplace_name	string	Public brand of the marketplace: 'HealthCare.gov' or the state exchange brand (e.g. Covered California).
oep_start	string	Open-enrollment start, ISO date.
oep_end	string	Open-enrollment end (final deadline), ISO date.
jan1_effective_deadline	string	Last day to enroll for coverage effective January 1, 2027 (ISO date); enrolling after this date yields a February 1, 2027 start where the window stays open.
window_days	integer	Length of the enrollment window in days, inclusive.
late_window_days	integer	Days between the Jan-1-effective deadline and the final deadline (the February-1-coverage tail); 0 for Idaho.
close_relative	string	How the state's close compares to the federal Jan 15 close: early / standard / extended.
window_urgency_tier	string	Dataset-internal tier on window length for lead prioritization: Compressed (<76 days), Standard (76–85), Extended (>85).
deadline_note	string	Superseded announcements, corrections (notably RI), and state-specific context; empty where the announced window is uncontested.
source_url	string	healthinsurance.org FAQ for all rows; HealthSource RI's official page for RI.
retrieved_at	string	Observation date of the transcription (2026-10-01); constant for idempotency.
row_hash	string	md5(abbr\|platform\|brand\|start\|end\|jan1)[:16].

First 10 sample rows — a preview, not the complete dataset.

geo_code	country_code	state_abbr	state_name	marketplace_platform	marketplace_name	oep_start	oep_end	jan1_effective_deadline	window_days	late_window_days	close_relative	window_urgency_tier	deadline_note	source_url	retrieved_at	row_hash
US-AK	USA	AK	Alaska	federal	HealthCare.gov	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	ceabd4093699bcd0
US-AL	USA	AL	Alabama	federal	HealthCare.gov	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	93996653974a6552
US-AR	USA	AR	Arkansas	federal	HealthCare.gov	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	580f108681e618de
US-AZ	USA	AZ	Arizona	federal	HealthCare.gov	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	dd0a0189cb0e22f7
US-CA	USA	CA	California	state-based	Covered California	2026-11-01	2027-01-31	2026-12-15	92	47	extended	Extended	Extended window; enroll by Dec 15, 2026 for Jan 1 coverage.	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	7f009503c7b3977c
US-CO	USA	CO	Colorado	state-based	Connect for Health Colorado	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	dc278752130e0099
US-CT	USA	CT	Connecticut	state-based	Access Health CT	2026-10-23	2027-01-15	2026-12-15	85	31	standard	Standard	Starts Oct 23, 2026 (with MA); an older announcement listed Dec 23, 2026 as the end — superseded by the post-ruling Jan 15, 2027 deadline.	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	803adc985904a4cb
US-DC	USA	DC	District of Columbia	state-based	DC Health Link	2026-11-01	2027-01-31	2026-12-15	92	47	extended	Extended	Extended window.	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	1ea553bfa6b1a148
US-DE	USA	DE	Delaware	federal	HealthCare.gov	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	16992c62696388e2
US-FL	USA	FL	Florida	federal	HealthCare.gov	2026-11-01	2027-01-15	2026-12-15	76	31	standard	Standard	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/	2026-10-01	5daee7fa0d48f6e4

Profiled Oct 2, 2026 from snapshot 20261001T231602Z-bb99fcaddee3

Measured

Completeness: 100%
Rows: 51
Columns: 17
Columns with gaps: 0

Column	Missing	Distinct	Range	Distribution
geo_codevarchar	0%	54	—	US-AK1 US-AL1 US-AR1
country_codevarchar	0%	1	—	USA51
state_abbrvarchar	0%	55	—	AK1 AL1 AR1
state_namevarchar	0%	59	—	Alabama1 Alaska1 Arizona1
marketplace_platformvarchar	0%	2	—	federal29 state-based22
marketplace_namevarchar	0%	26	—	HealthCare.gov29 Access Health CT1 Connect for Health Colorado1
oep_startvarchar	0%	3	—	2026-11-0148 2026-10-232 2026-10-151
oep_endvarchar	0%	5	—	2027-01-1543 2027-01-315 2026-12-151
jan1_effective_deadlinevarchar	0%	3	—	2026-12-1549 2026-12-231 2026-12-311
window_daysbigint	0%	6	62 → 93median 76	2 outside 1st–99th percentile
late_window_daysbigint	0%	5	0 → 47median 31	1 outside 1st–99th percentile
close_relativevarchar	0%	3	—	standard43 extended7 early1
window_urgency_tiervarchar	0%	3	—	Standard43 Extended7 Compressed1
deadline_notevarchar	0%	13	—	37 Extended window.3 An older announcement listed Dec 31, 2026 as the end — superseded by the post-ruling Jan 15, 2027 deadline.1
source_urlvarchar	0%	2	—	https://www.healthinsurance.org/faqs/what-are-the-deadlines-for-the-acas-open-enrollment-period/50 https://healthsourceri.com/oe/1
retrieved_atvarchar	0%	1	—	2026-10-0151
row_hashvarchar	0%	53	—	04fbb6ccbbd132c91 0a958a22a1f70abb1 122d243bb40771861

Point any LLM at the metadata endpoint — the documentation above is machine-readable too (JSON-LD + Croissant).

cURL

curl "https://datazimuts.com/v1/datasets/us_aca_open_enrollment_intel/us_aca_open_enrollment_calendar" | jq '{title, rows, columns_count, license}'

Python

import requests

ds = requests.get("https://datazimuts.com/v1/datasets/us_aca_open_enrollment_intel/us_aca_open_enrollment_calendar").json()
print(ds["title"], ds["rows"], "rows")

# Sample rows for an LLM context window
for row in ds.get("sample_rows", [])[:5]:
    print(row)

API endpoint: https://datazimuts.com/v1/datasets/us_aca_open_enrollment_intel/us_aca_open_enrollment_calendar

Tip: fetch /llms.txt for the full machine-readable catalog.

Cite this snapshot

Pinned to snapshot 20261001T231602Z-bb99fcaddee3 and its content hash, so readers get exactly the data you used.

APA

US ACA open-enrollment calendar intelligence (2027 coverage). (2026). US ACA open-enrollment calendar (2027 coverage, by state) [Data set, snapshot 20261001T231602Z-bb99fcaddee3, sha256 bb99fcaddee3]. Datazimuts. Retrieved 2026-10-02, from https://datazimuts.com/en/datasets/us_aca_open_enrollment_intel/us_aca_open_enrollment_calendar?snapshot=20261001T231602Z-bb99fcaddee3

BibTeX

@misc{dz_us_aca_open_enrollment_intel_us_aca_open_bb99fcad,
  title        = {{US ACA open-enrollment calendar (2027 coverage, by state)}},
  author       = {{US ACA open-enrollment calendar intelligence (2027 coverage)}},
  year         = {2026},
  publisher    = {Datazimuts},
  howpublished = {\url{https://datazimuts.com/en/datasets/us_aca_open_enrollment_intel/us_aca_open_enrollment_calendar?snapshot=20261001T231602Z-bb99fcaddee3}},
  note         = {Snapshot 20261001T231602Z-bb99fcaddee3, sha256 bb99fcaddee3b0b916c3c7f3622598f782598f2e8905600785ac106c0e4a07f0; accessed 2026-10-02}
}

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US ACA open-enrollment calendar (2027 coverage, by state)

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