The street carnival of Rio de Janeiro transcends official milestones and has been part of the city's culture for centuries. The official start date of this vibrant tradition is not well-defined, but there are records dating back to the Imperial period, revealing its origins as a gradual development shaped by various social groups. The event, marked by colorful parades and lively music, reflects a rich tapestry of the city's history and social dynamics.

As the city prepares for the official start of festivities, about 7 million people are expected to take to the streets for Carnival 2026, according to Riotur. This immense gathering showcases the unity and diversity found within Rio, as individuals from different backgrounds come together to participate in the celebration. Cultural critic and PUC-Rio professor Miguel Jost emphasized that the Carnival that emerged in neighborhoods like Estácio, Gamboa, and Saúde is a manifestation of the cultural fusion brought by migrants, particularly from Brazil's northeastern regions, during the late 19th and early 20th centuries.

Many of the earliest street bands ('ranchos') were formed by individuals from Bahia, Sergipe, Pernambuco, and Alagoas, competing for space in the revelry. The carnival has not only served as a platform for cultural expression but also plays a vital role in fostering community ties and identity. With its roots entrenched in the struggles and celebrations of the past, the Rio Carnival is a testament to the resilience and creativity of its people, enhancing the city's reputation as a global cultural hub.