🇧🇷How does Brazil mark Environment Days?

Dia da Árvore

Local date

September 21, 2026

When is it?

The week beginning 21 September in the south-eastern, southern and central-western states and the Federal District; the last week of March in the northern and north-eastern states.

Brazil's tree day has two dates, and in law it has already been renamed. Article 1 of Decree No. 55,795 of 24 February 1965 establishes, throughout the national territory, the Annual Festival of Trees — "in substitution for the so-called Tree Day currently celebrated on 21 September." Article 3 explains why one date would not do: the country's physiographic and climatic range is too wide, so Acre, Amazonas, Pará, Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas, Sergipe and Bahia mark it in the last week of March, while Espírito Santo, Rio de Janeiro, Minas Gerais, Goiás, Mato Grosso, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul and the Federal District mark it in the week beginning 21 September. Article 4 assigns the celebrations to the ministries of Agriculture and of Education and Culture. Sixty years on, what Brazilians actually say is still the superseded name, Dia da Árvore. It is not a national holiday: Law No. 662 of 1949, in the wording given by Law No. 10,607 of 2002, lists 1 January, 21 April, 1 May, 7 September, 2 November, 15 November and 25 December. The environment day Brazil did put into a statute is a different one — Law No. 12,633 of 14 May 2012 created the National Environmental Education Day on 3 June, nationwide, and it is not a day off either.