Americans are getting ready for the annual fall-back clock change, bringing an extra hour overnight but also signaling the arrival of earlier sunsets. On Sunday, November 1, 2026, most parts of the country will move from daylight saving time to standard time, with clocks turning back from 2 a.m. to 1 a.m. While the adjustment sounds simple, it can affect everything from sleep schedules and morning commutes to electronic devices and travel plans. Some states and territories will skip the change altogether, while owners of older clocks may need to make manual adjustments. With another seasonal transition underway, here are eight important things Americans should know before Sunday morning.
Daylight Saving Time Ends at 2 a.m. on November 1
The familiar fall-back ritual returns on Sunday, November 1, 2026, giving most Americans a reminder to adjust their clocks before starting the day. At exactly 2 a.m. local time, clocks in areas observing daylight saving time will move backward to 1 a.m., repeating that hour and officially returning to standard time. Unlike the spring transition, when clocks jump forward and an hour disappears, the November adjustment adds an extra hour to the day. This change follows the federal schedule established under the Energy Policy Act of 2005, which took effect in 2007. Under the current rules, daylight saving time begins on the second Sunday in March and ends on the first Sunday in November. People can adjust manual clocks before going to bed Saturday night, while most internet-connected devices should update automatically. The transition also means that sunrise and sunset will occur approximately an hour earlier according to the clock, changing how daylight is distributed throughout the day.
Most Americans Will Gain an Extra Hour of Sleep
There is a small consolation to the darker evenings arriving with November: most Americans get an additional hour overnight when daylight saving time ends. When the clock moves from 2 a.m. back to 1 a.m., that hour happens twice, giving people more time before the morning routine begins. However, gaining an hour on the clock does not necessarily mean everyone will immediately enjoy better sleep. The body’s internal clock, known as the circadian rhythm, responds to environmental signals such as sunlight and darkness rather than simply following the numbers displayed on a bedside clock. Some people may find the adjustment easy, while others could experience temporary changes in their usual sleeping and waking patterns. The return to standard time also brings brighter mornings and earlier sunsets, which can influence daily routines, particularly for people who exercise outdoors or commute after work. Health organizations generally favor standard time throughout the year because its relationship with natural sunlight better supports the body’s internal sleep-wake cycle.
Daylight Saving Time Lasts for 238 Days in 2026
The United States spends a surprisingly large portion of each year observing daylight saving time. In 2026, the period began on March 8 and ends on November 1, covering 238 days, or approximately 65% of the calendar year. The current schedule dates back to the Energy Policy Act of 2005, which extended daylight saving time by several weeks beginning in 2007. Before that change, the United States generally began daylight saving time in April and ended it in October. The longer schedule was introduced partly to encourage energy savings by shifting more daylight into the evening, when people might otherwise use artificial lighting at home. However, the actual energy benefits have remained a subject of debate, with research producing mixed conclusions depending on location, climate, and consumer habits. The law also allows Congress to reconsider the arrangement. For now, though, the familiar March and November transitions remain in place, meaning Americans will continue moving their clocks twice a year unless federal legislation changes the system.
Hawaii and Arizona Are Among the Places That Do Not Change Clocks
Not everyone in the United States needs to participate in the November clock adjustment, and the exceptions can catch visitors by surprise. Hawaii, most of Arizona, American Samoa, Guam, Puerto Rico, and the U.S. Virgin Islands remain on standard time throughout the year. These locations do not move their clocks forward in March or backward in November. Arizona has one particularly important exception: the Navajo Nation observes daylight saving time, even though most of the surrounding state does not. This creates an unusual situation in which neighboring communities can follow different clock schedules during part of the year. The decision not to observe daylight saving time often reflects local preferences, geography, and practical considerations. Hawaii, for example, has relatively little seasonal variation in daylight hours because of its tropical location. Arizona’s decision is also connected to the state’s hot climate, where extending evening daylight can mean people remain active outdoors during the hottest part of the day. Travelers should check local time differences before arranging flights, appointments, or business calls during the transition weekend.
Smartphones and Computers Should Update Automatically
Most Americans will not need to reach for their phones or computers to make the November time adjustment. Modern smartphones, tablets, laptops, and other internet-connected devices generally update automatically when daylight saving time ends, provided their operating systems have the correct time zone information and current software updates. However, there is an important distinction between receiving accurate time information and displaying the correct local time. NIST distributes Coordinated Universal Time, commonly known as UTC, through its time services. UTC provides a universal reference, but the device’s operating system is responsible for applying the appropriate local time zone and daylight saving rules. This means an outdated computer may still display the wrong local time even if it receives an accurate signal from an official time server. People who notice an incorrect clock on Sunday should check their automatic date and time settings, selected time zone, and available software updates. It is also worth checking smart home devices, vehicle displays, and older electronic appliances that may not synchronize as frequently as smartphones.
Older Automatic Clocks May Need Manual Adjustments
That automatic clock sitting on a bedside table may not be as reliable as it once was, particularly if it was manufactured before the current daylight saving schedule took effect. Some electronic clocks sold under names such as AUTOSET and SMARTSET use internal firmware to determine when they should move forward or backward by an hour. Unlike radio-controlled clocks, these models may not receive updated time information from an external service. Instead, they rely on dates programmed into their internal systems. Older models may still follow the previous federal schedule, which placed the beginning and end of daylight saving time on different Sundays. As a result, certain clocks can change at the wrong time or fail to make the adjustment altogether. NIST recommends checking with the manufacturer if an older automatic clock no longer follows the current rules. Depending on the model, owners may need to adjust the time manually, obtain a firmware update, or replace the device. Checking these clocks before relying on them for an early appointment or work shift can prevent unnecessary confusion.
Radio-Controlled Clocks Should Make the Change Automatically
Radio-controlled clocks offer another way to keep track of the seasonal time adjustment without manually resetting the display. Many of these devices receive signals from NIST’s WWVB radio station in Colorado, which broadcasts precise time information throughout the United States. The signal includes information indicating whether daylight saving time or standard time is currently in effect. Compatible clocks use that information to make the necessary adjustment automatically. However, the process depends on the device successfully receiving the broadcast. Thick walls, electrical interference, poor placement, and distance from the signal can sometimes prevent a clock from synchronizing properly. If a radio-controlled clock displays the wrong time after November 1, owners should check its synchronization indicator and consult the manufacturer’s instructions for improving reception. It is also important to verify the selected time zone. People living in Hawaii and most of Arizona should pay particular attention to the automatic daylight saving setting because these locations do not observe the seasonal change. Leaving the feature enabled could cause an otherwise accurate clock to display the wrong local time.
