International Day of the Tropics2026 · Date · History · Messages
A/RES/70/267
About International Day of the Tropics
International Day of the Tropics is observed on 29 June. The UN General Assembly designated the day through resolution A/RES/70/267 on 14 June 2016.
The day focuses attention on the environmental, social, economic and demographic importance of the tropical region, including both its extraordinary diversity and the development challenges faced across tropical countries and communities.
Why International Day of the Tropics matters
The Tropics stretch broadly between the Tropic of Cancer and the Tropic of Capricorn. The observance encourages people to examine tropical issues as connected global questions rather than as isolated local concerns.
UN material links the day to sustainable development and to better understanding of challenges such as climate change, deforestation, urbanization, health, infrastructure, biodiversity loss and demographic change.
History of International Day of the Tropics
A consortium of twelve leading tropical research institutions launched the inaugural State of the Tropics Report on 29 June 2014.
Australia led the effort in the General Assembly and introduced the multinational draft A/70/L.53. On 14 June 2016, the Assembly adopted A/RES/70/267 without a vote.
The inaugural International Day of the Tropics was celebrated on 29 June 2016, exactly two years after the report launch.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
Australia, leading a broad multinational sponsor group
UN meetings coverage records the representative of Australia introducing the resolution; A/70/L.53 and its addendum document the wide sponsor group.
United Nations General Assembly
UN General Assembly resolution A/RES/70/267
First documented observance
James Cook University’s State of the Tropics material identifies 29 June 2016 as the inaugural/first International Day, consistent with the General Assembly meeting record.
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
3 fields not established in reviewed sources
How to Observe International Day of the Tropics
Use reliable regional data to compare one environmental and one social indicator across several tropical countries without treating the Tropics as a single homogeneous region.
Map how a tropical issue such as coastal risk, heat, biodiversity or food systems connects local decisions with global supply chains and climate pressures.
Read a State of the Tropics resource alongside a current UN or scientific source and identify which trends have changed since the original report.
Highlight tropical research institutions, Indigenous knowledge holders and local organizations rather than presenting outside observers as the sole source of expertise.
International Day of the Tropics Facts
The observance falls on 29 June.
A/RES/70/267 was adopted on 14 June 2016.
Australia introduced the draft resolution in the General Assembly on behalf of a broad multinational sponsor group.
The first International Day of the Tropics was celebrated on 29 June 2016.
The date marks the anniversary of the inaugural State of the Tropics Report launched on 29 June 2014.
International Day of the Tropics Messages
On International Day of the Tropics, may appreciation for the natural world lead to informed stewardship and practical care for the places and species around us.
May International Day of the Tropics inspire curiosity about the living world and thoughtful action to protect it.
Celebrate International Day of the Tropics by learning from credible conservation sources and choosing one practical way to reduce harm or support protection.
Wishing everyone marking International Day of the Tropics a day of discovery, respect for nature and care that continues beyond today.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
United Nations Digital Library — A/70/L.53 (opens in a new tab)
United Nations Digital Library — A/RES/70/267 (opens in a new tab)
United Nations Meetings Coverage — General Assembly adoption and Australian introduction (opens in a new tab)
James Cook University / State of the Tropics — inaugural 2016 observance (opens in a new tab)
United Nations — International Day of the Tropics (opens in a new tab)
United Nations — List of International Days and Weeks (opens in a new tab)
United Nations — Observances: who chooses them and how (opens in a new tab)
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is International Day of the Tropics?
29 June The documented recurrence rule is: 29 June.
Does International Day of the Tropics fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is International Day of the Tropics an official public holiday?
The reviewed sources verify it within this scope: United Nations / international observance. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes International Day of the Tropics?
The reviewed sources identify United Nations General Assembly as the proclaiming or establishing body. The proposer or originator is recorded separately as Australia, leading a broad multinational sponsor group.
Is International Day of the Tropics international or country-specific?
The documented scope is international or global: United Nations / international observance. That does not mean every country treats the date as a public holiday or observes it in the same way.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-05.
Why is International Day of the Tropics on 29 June?
The UN observance page says the date marks the anniversary of the launch of the inaugural State of the Tropics Report on 29 June 2014.
When was the first International Day of the Tropics?
The inaugural observance was celebrated on 29 June 2016, shortly after the General Assembly adopted the establishing resolution.
Who proposed the UN day?
Australia introduced the resolution in the General Assembly, while A/70/L.53 lists a broad multinational group of sponsors and later additional sponsors.
Other observances on June 29
These observances are also listed on June 29, 2027.
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World Forum Foundation / Nature Action Collaborative for Children
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World Industrial Design Day
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