Iceland observes thirteen official public holidays annually, fixed by the Act on Public Holidays No. 162/1987 as amended. New Year's Day falls on January 1. Maundy Thursday, Good Friday, Easter Sunday, and Easter Monday shift according to the ecclesiastical lunar calendar. The First Day of Summer, a unique Icelandic holiday dating to medieval calendrical systems, occurs on the first Thursday after April 18, usually falling between April 19 and April 25. Labour Day is May 1. Ascension Day occurs 39 days after Easter Sunday. Whit Sunday and Whit Monday arrive seven and eight weeks after Easter, respectively. National Day is June 17. Commerce Holiday takes place on the first Monday of August. Christmas Eve afternoon (from noon), Christmas Day, and Boxing Day are December 24, 25, and 26. New Year's Eve afternoon (from noon) closes December 31.
National Day on June 17 commemorates the 1944 establishment of the Republic of Iceland at Þingvellir, ending the personal union with Denmark that had persisted since the 1918 Act of Union. Denmark was occupied by Nazi Germany from April 1940, rendering the union functionally void. A four-day plebiscite conducted May 20-23, 1944, yielded 97.35% approval for ending the union and 95.03% for adopting the republican constitution. Sveinn Björnsson became the first President on June 17, 1944, at a ceremony held at Þingvellir where the Alþingi had first convened in 930. Modern celebrations include the official ceremony at Þingvellir attended by the President and government officials, parades in every municipality featuring brass bands and drum corps, public speeches, street performers, and evening concerts. Reykjavík sees the largest parade departing from Austurvöllur square, circling the city center with participation from sports clubs, scout troops, and cultural organizations. The Icelandic Woman of the Year (Fjallkonan, representing Iceland as a female personification) delivers a patriotic poem at the main ceremony. Streets fill with children waving paper Icelandic flags. Weather variability means outdoor events proceed regardless of conditions, which have ranged from 18°C sunshine to 4°C rain with wind.
The First Day of Summer, moved to public holiday status in 1971 though observed informally for centuries, reflects the two-season Old Norse calendar that divided the year into summer and winter rather than four seasons. Medieval Icelandic texts including Landnámabók specify this day as beginning the summer half-year. Contemporary celebrations center on community gatherings, sports competitions, and the expectation of receiving a summer gift (often small toys or sweets for children). Akureyri hosts football tournaments and fun runs. Many families travel to summer cottages for the long weekend. The holiday occurs regardless of actual weather, often in full winter conditions with snow and freezing temperatures. The 2023 First Day of Summer on April 20 saw Reykjavík temperatures at 2°C with sleet.
Labour Day on May 1 became an official holiday in 1923 following decades of labor movement organizing. The Icelandic Federation of Labour (Alþýðusamband Íslands, ASÍ) founded in 1916 coordinates the main Reykjavík event, a march from Hlemmur to Lækjartorg square followed by speeches from union leaders and politicians. Participation has varied from 5,000 during economic downturns to 20,000 in prosperous years. The 2009 march following the October 2008 financial collapse drew approximately 15,000 protesters demanding government accountability. Music performances, children's activities, and food stalls operate in downtown Reykjavík through afternoon. Regional towns hold smaller parallel events. Political parties use the occasion for policy announcements, particularly regarding workers' rights, wage negotiations, and welfare provisions.
Commerce Holiday (Verslunarmannahelgi) occurs on the first Monday of August, creating a three-day weekend called "the long weekend" or "the bank holiday weekend." Established in 1894 to provide shop workers a guaranteed rest period during summer, it now triggers the largest internal migration of the year. Approximately 100,000 people leave urban areas for campsites, summer cottages, or outdoor festivals. Þjóðhátíð, held in Vestmannaeyjar (Westman Islands) since 1874, draws 15,000-17,000 attendees to a campsite valley for a three-day music festival despite the islands' permanent population of 4,300. Ferry company Herjólfur adds extra sailings and larger vessels to transport attendees from Landeyjahöfn. The festival program runs continuously from Friday evening through Monday, featuring Icelandic pop, rock, and folk acts on multiple stages, culminating in a fireworks display Monday evening. Concurrent festivals occur across Iceland: Neistaflug in Neskaupstaður (East Fjords), Bræðslan in Borgarfjörður Eystri, Innipúkinn in Reykjavík focusing on acoustic music. Campsite reservations open months in advance and fill within hours for popular locations including Þórsmörk, Landmannalaugar, and Ásbyrgi.
Christmas observance follows Nordic traditions with Icelandic particularities. Families exchange books on Christmas Eve (Jólabókaflóð, the "Christmas Book Flood"), a custom intensified after World War II when paper remained one of few unrationed commodities while other goods faced restrictions. Publishers release the majority of annual titles in September and October, compiled into Bókatíðindi, a catalog distributed free to every household in November. Book sales constitute 35-40% of annual totals in November and December according to Icelandic Publishers Association statistics. Christmas Eve proceeds with afternoon church services (attendance approximately 10% of population at Evangelical Lutheran churches), evening family dinner traditionally featuring smoked lamb (hangikjöt), ptarmigan, or pork, followed by book reading. Thirteen folkloric figures called Jólasveinar (Yule Lads) arrive sequentially from December 12 to December 24, each known for specific mischief: Stekkjastaur harasses sheep, Giljagaur hides in gullies to steal milk, Stúfur is abnormally short and steals pans to eat crusts. Children place shoes in windows; well-behaved children receive small gifts while misbehaving ones find rotting potatoes. The Yule Lads depart sequentially from December 25 through January 6. Their mother, the ogress Grýla who kidnaps and eats misbehaving children, and the Yule Cat (Jólakötturinn) who devours people not receiving new clothes for Christmas, feature in decorations and stories. New Year's Eve involves community bonfires (organized by rescue squads as fundraisers), family gatherings for dinner (traditionally hangikjöt again), and extensive private fireworks from 11pm to past midnight. Sales of fireworks to the public are legal only December 28 through January 6, with proceeds supporting Search and Rescue Association (Landsbjörg). The 2022-23 season saw fireworks sales of 638 million ISK (approximately 4.5 million USD). Downtown Reykjavík becomes a dense fireworks display zone with no organized municipal show. Hallgrímskirkja hosts Áramótaskaup, a satirical year-in-review comedy show broadcast on national television RÚV at 10:30pm, watched by 70-80% of the population.