Daylight Saving Time 2026 in the United States: Start and End Dates, Observers, and the Sunshine Protection Act Status

Key 2026 DST Dates and Observers

In 2026, the United States follows the familiar pattern established by federal law: DST starts on the second Sunday in March and ends on the first Sunday in November. For 2026, DST begins on Sunday, March 8, at 2:00 a.m. local time, when clocks move forward to 3:00 a.m. local daylight time. DST ends on Sunday, November 1, at 2:00 a.m. local time, when clocks are set back to 1:00 a.m. local standard time.

Most of the United States participates in DST, but some areas do not observe it year-round. Hawaii and most of Arizona stay on standard time year-round. The Navajo Nation, located in parts of Arizona, does observe DST, creating an exception within Arizona. The U.S. territories—American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands—do not observe DST. In all cases, the official guidance comes from the U.S. Department of Transportation and timekeeping authorities, with NIST providing authoritative calendar references when needed.

The above dates reflect the current legal framework and observed practice in 2026. If a shift to permanent DST or permanent standard time were to be enacted, the dates and rules would change accordingly.

Sunshine Protection Act: Status in 2026

The Sunshine Protection Act has moved through Congress in 2026 but has not yet become law. Specifically, the U.S. House of Representatives passed the bill on July 14, 2026, and it was referred to the Senate, where it remained under consideration as of September 2026. Until Congress takes final action, the current pattern—DST for most of the country with exemptions for Arizona (except the Navajo Nation) and Hawaii, and no changes to the territories—remains in effect.

If the law were enacted to make DST permanent year-round, most of the country would keep summer hours permanently, shifting sunrise and sunset times accordingly. If the act moves toward permanent standard time, the opposite would occur: clocks would stay on standard time all year, maintaining earlier sunrises in winter and earlier sunsets in winter evenings.

Health, Safety, and Energy Considerations

The DST debate often centers on health, safety, and energy use. Health researchers have documented measurable effects linked to clock changes. In particular, the spring transition is associated with disruptions to sleep that can raise health risks, including heart-related events and traffic incidents. Across multiple studies, the spring shift has been connected to increased heart attack risk and more fatal traffic crashes, though exact figures vary by study and context.

A 2017 meta-analysis of 44 studies found that DST reduces electricity use by about 0.3% on the days it applies, while other studies have suggested that DST can increase energy use through effects on heating and cooling and overall consumption. In addition to energy considerations, some analyses have reported that clock changes can affect motor fuel consumption and other economic factors, though findings depend on methodology and location.

Important health organizations have weighed in on this topic. The American Academy of Sleep Medicine (AASM) and about 20 other health organizations advocate for permanent standard time, citing circadian disruption and health risks. Proponents of permanent DST emphasize potential economic and recreational benefits. This framing matters for readers weighing the trade-offs between health and other considerations.

Legal Framework and Historical Precedent

The modern system of standardized DST in the United States emerged from the Uniform Time Act of 1966, which coordinated the start and end dates of DST nationwide while allowing exemptions for certain jurisdictions. The 1970s energy crisis prompted several extensions and adjustments to the DST schedule. In 1974, the United States briefly adopted year-round DST in response to the energy crisis, but public opposition to dark winter mornings led Congress to repeal year-round DST by October of that year.

The current schedule—DST from the second Sunday in March to the first Sunday in November—was established in 2007 under federal law (the Energy Policy Act of 2005). Since then, the shift has remained the basis for most of the country’s timekeeping, with the usual exceptions for Arizona (excluding the Navajo Nation), Hawaii, and the U.S. territories.

Historical context matters because it explains why many health and safety advocates favor permanent standard time, while supporters of permanent DST point to other benefits. It also helps readers understand why a single national policy has proven politically complex to implement, despite broad interest in avoiding twice-yearly clock changes.

Which States and Territories Do Not Observe DST?

The vast majority of the United States observes DST, but two large states do not observe it year-round: Hawaii and most of Arizona. The Navajo Nation, which spans parts of Arizona, New Mexico, Utah, and Colorado, does observe DST, creating an exception within Arizona’s borders. In addition, the U.S. territories—American Samoa, Guam, the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands—do not observe DST.

Arizona’s general opt-out is tied to extremely hot summer conditions; the extra evening daylight would raise cooling costs and shift sunset times later when late-afternoon heat is most oppressive. Hawaii’s latitude minimizes the variation in daylight across seasons, making DST less useful there.

These practical considerations help explain why certain places maintain year-round standard time, while others, including the Navajo Nation, align with the broader national practice.

How to Adjust Clocks and Devices (Practical Guidance)

When DST begins or ends, update clocks and connected devices to reflect the correct local time. Smartphones, computers, and many internet-connected devices typically adjust automatically, while traditional clocks, wall clocks, and some appliances may require manual changes.

A biannual reminder that comes with the clock change can be put to practical use: use the time shift as a cue to replace smoke detector batteries, check HVAC filters, and restock emergency supplies for colder weather. This simple practice helps households align time changes with seasonal maintenance.

If your business or scheduling relies on multiple time zones, verify that software and calendars reflect the correct DST rules for each location, since some regions observe DST differently or not at all.

Terminology Note: “Daylight Saving Time” vs. “Daylight Savings Time”

The form daylight saving time (without an “s” after saving) is the traditional, technical term in American English. A large portion of everyday usage uses “daylight savings time” (with an “s”). In this article, we acknowledge both forms and indicate that “daylight saving time” is technically correct in formal contexts, while readers commonly search for “daylight savings time.”

A Brief Decision Context for Readers

For readers weighing permanent DST versus permanent standard time, the evidence points to health and safety concerns favoring standard time, while economic and recreational arguments sometimes favor DST. The American Academy of Sleep Medicine and other health groups advocate fixed standard time year-round, emphasizing circadian stability and reduced health risks. However, some research and polls suggest a growing interest in permanent DST among the public. As of 2026, no federal law has been enacted to make DST permanent, so the current pattern remains in effect unless Congress acts.

FAQ Highlights

When does DST start in 2026? Sunday, March 8, 2026, at 2:00 a.m. local time, clocks move forward to 3:00 a.m. local daylight time.

When does DST end in 2026? Sunday, November 1, 2026, at 2:00 a.m. local time, clocks fall back to 1:00 a.m. standard time.

Which states don’t observe DST? Hawaii and most of Arizona (the Navajo Nation does observe DST). The U.S. territories do not observe DST.

What is the Sunshine Protection Act? A 2026 proposal to make DST permanent. The House passed the bill on July 14, 2026; the Senate had not enacted it by September 2026. Final status depends on Congressional action.

What about health and energy effects? The spring shift is linked to health and safety risks, including heart attacks and crashes in some studies. A 2017 meta-analysis found DST reduces electricity use by about 0.3% on DST days, while other studies indicate possible increases in energy use due to cooling demands. The American Academy of Sleep Medicine and many health groups advocate permanent standard time due to circadian health concerns.

Notes on Sources and Authority

Official calendars and DST rules are governed by federal law and DOT guidance, with NIST providing reference calendars. When permanent-time options are debated, health organizations and policy researchers provide the critical health, safety, and energy context that readers should weigh in decision-making.