National Tree Day2026 · Date · History · Messages
Planet Ark says Australia’s National Tree Day began in 1996 and is held on the last Sunday in July; its official materials also document the program’s founding history and locally adaptable planting guidance.
About National Tree Day
National Tree Day is Planet Ark’s Australian community tree-planting and nature-care event, observed on the last Sunday in July.
The program began in 1996 and has grown into a nationwide initiative involving schools, councils, community groups, volunteers and environmental projects.
Why National Tree Day matters
National Tree Day is intended to connect people with practical nature-care activities and community stewardship.
Planting is only one form of participation: habitat work, site maintenance, seed collection and other locally appropriate conservation activities can also fit the program.
History of National Tree Day
Planet Ark says National Tree Day was established in 1996. An official earlier Tree Day guide credits Olivia Newton-John and Planet Ark as co-founders.
The program now dedicates the last Sunday in July to National Tree Day, while Schools Tree Day is held on the last Friday in July.
Planet Ark explains that July was chosen at the program’s inception after advice that it was, on average, a suitable planting period across Australia, while acknowledging that Australia’s climates vary widely.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
Olivia Newton-John and Planet Ark
An official Planet Ark Tree Day guide describes National Tree Day and Schools Tree Day as co-founded by Olivia Newton-John and Planet Ark in 1996.
Planet Ark
Planet Ark identifies National Tree Day as its program, established in 1996.
First documented observance
Planet Ark states that National Tree Day was established/started in 1996; an exact first event date is not asserted.
Planet Ark
Planet Ark maintains the National Tree Day program, registration, guidance and current schedule.
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.
5 fields not established in reviewed sources
How to Observe National Tree Day
Join a registered local event or another properly authorized community planting or nature-care project.
Use species and planting methods appropriate to the local ecosystem, and seek local guidance rather than assuming every native plant belongs in every site.
Get landowner or site-manager permission before planting and follow local biosecurity, conservation, tool and workplace-safety requirements.
Choose non-planting activities such as habitat maintenance, seed collection or environmental learning when planting is not appropriate for the location or season.
National Tree Day Facts
Australia’s National Tree Day is held on the last Sunday in July.
Planet Ark says the program was established in 1996.
An official Planet Ark Tree Day guide credits Olivia Newton-John and Planet Ark as co-founders.
Schools Tree Day is a related program held on the last Friday in July.
Planet Ark notes that local climate can make another planting time more suitable, which is why not every community activity has to involve planting on the national date itself.
National Tree Day Messages
Happy National Tree Day to everyone planting, restoring habitat and caring for local nature across Australia.
Here’s to thoughtful planting, healthy habitats and communities working together on National Tree Day.
Wishing volunteers a safe and rewarding National Tree Day, whether you plant, maintain habitat or help a local project in another way.
Happy National Tree Day—plant where it makes sense, care for what is already growing and give local nature a hand.
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.
Planet Ark — National Tree Day Help (opens in a new tab)
Event Organizer
Planet Ark — National Tree Day, Our Story (opens in a new tab)
Event Organizer
Planet Ark — Tree Day Schools Getting Started Guide (opens in a new tab)
Event Organizer
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 National Tree Day?
Last Sunday in July; 26 July 2026 verified The documented recurrence rule is: Last Sunday in July.
Does National Tree Day fall on the same date every year?
It follows a recurring calendar rule, so the Gregorian date can change from year to year.
Is National Tree Day an official public holiday?
The reviewed sources verify it within this scope: Australia / Planet Ark community nature-care program. 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 National Tree Day?
The reviewed sources identify Planet Ark as the proclaiming or establishing body. The proposer or originator is recorded separately as Olivia Newton-John and Planet Ark. Current facilitation or coordination is recorded as Planet Ark.
Is National Tree Day international or country-specific?
This observance is specific to Australia. Its fuller verified scope is: Australia / Planet Ark community nature-care program.
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 2026-09-19.
When is National Tree Day in Australia?
It is observed on the last Sunday in July.
Who started National Tree Day?
Planet Ark says the program began in 1996, and an official Tree Day guide credits Olivia Newton-John and Planet Ark as co-founders.
Is National Tree Day only about planting trees?
No. Planet Ark also supports other nature-care and restoration activities where planting is not suitable.
Should I plant any native tree anywhere?
No. Use locally appropriate species, obtain permission and follow ecological, biosecurity and site guidance for the place where you are working.
Other observances on July 25
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Costa Rica’s Ministry of Public Education marks 25 July as the anniversary of the Annexation of the Partido de Nicoya.
Annexation of the Partido de Nicoya
Costa Rica’s Ministry of Labour identifies July 25, the Annexation of the Partido de Nicoya, as a mandatory paid holiday under Labour Code article 148; Ministry of Culture material document…
Auntie's Day
Melanie Notkin’s first-party site states that she established Auntie's Day in 2009 and that it recurs every fourth Sunday in July.
Día de la Constitución (Day of the Constitution)
Puerto Rico Act No. 1 of August 1, 1952 directly establishes July 25 each year as Día de la Constitución and ties the date to the Constitution taking effect on July 25, 1952.
Fiestas Patronales de Santiago — Somoto
Nicaragua’s official National Tourism Map describes Somoto’s patronal celebrations honoring Santiago around 25 July and notes an extended festival period.
International Day for Judicial Well-being
A/RES/79/266