Author's note
I love the European Alps, but Katoomba will always be special to me. It may not be Chamonix, Innsbruck or Garmisch, but it's where my obsession with the mountains really began.
Data story
Blue Mountains Through the Years
How has the Blue Mountains changed over time?
A data story about one of Australia's most visited protected landscapes, built from published Census, weather, transport, visitation, fire history and search-and-rescue datasets.
Hikezilla Insights · Updated 18 October 2026
Explore the story"Blue Mountains" means several different places: a national park, a local government area, a set of towns, and a World Heritage Area that is larger than any of them. Each dataset in this story describes one of those places, and the story says which one every time.
The place
One name, several different places
Chapter two · Census 2011, 2016 and 2021
The people around the park
Census counts for the eight statistical areas that cover the Blue Mountains townships
The Census does not count people in a national park. It counts residents of statistical areas, and eight of those — Blackheath – Megalong Valley, Blaxland – Warrimoo – Lapstone, Blue Mountains – North, Blue Mountains – South, Katoomba – Leura, Lawson – Hazelbrook – Linden, Springwood – Winmalee and Wentworth Falls — cover the towns strung along the ridge beside Blue Mountains National Park.
These areas are next to the park and partly overlap it. They are not the park, and no figure on this page should be read as the population of park land.
Statistical area boundaries can change between Census years. For these eight areas the ABS correspondence from 2016 to 2021 is a one-to-one match rated "Good", so the counts are comparable across 2011, 2016 and 2021.
Residents counted in the eight Blue Mountains statistical areas
Across the three Census years the counted population moves from 75,705 in 2011 to 76,708 in 2016 and 77,957 in 2021 — growth of about three per cent over a decade.
How to read this. These are residents of the statistical areas around the park, not visitors and not people inside the park. Statistical area boundaries are redrawn between Census years; comparisons here use the ABS correspondence files, which rate all eight of these areas as one-to-one matches of "Good" quality between 2016 and 2021. Median-age and income comparisons are not shown, because averaging medians across areas would not be a defensible figure.
Chapter three · 1990 to 2025
A changing climate
What three long-running weather stations have recorded since 1990
Three stations carry usable long records for the mountains: Katoomba (Farnells Rd) and Mount Boyce AWS on the upper ridge, and Springwood (Valley Heights) in the lower mountains. Each line below is that station's own record. A station describes conditions at its own location — not the weather across the Blue Mountains, which spans a kilometre of altitude and many valleys.
Daily observations are SILO patched-point records: gaps in the station record are filled by interpolation, so a year with full coverage is not the same as a year of unbroken instrument readings.
Rainfall recorded each year, by station
Average daily maximum temperature, by station
Where the observations are recorded
How to read this. Year-to-year rainfall in the mountains swings widely — Katoomba recorded 783 mm in 2019 and 2,022 mm in 2020 — so single years are not trends. Stations differ in altitude and coverage period, and no figure here describes conditions across the whole Blue Mountains.
Chapter four · October 2024 to August 2026
Getting there
Rail use at the seventeen Blue Mountains line stations
The railway climbs the ridge from Lapstone to Mount Victoria, and for many visitors it is the way in. Transport for NSW publishes monthly trips for each station, which is a measure of rail use at that station — by residents, commuters, workers and visitors alike.
This source covers October 2024 to August 2026 only, so it shows a recent pattern, not change over the decades. Rail trips are not park visits: the two are counted by different organisations for different purposes.
Monthly rail trips across the seventeen line stations
How to read this. Trips count rail use, not park entry. Where the source suppresses a small value it publishes a label such as "Less than 50" instead of a number; those entries are left out of totals rather than being turned into a figure, and none of the seventeen stations here carries one. Zig Zag, a heritage railway stop rather than a line station, is excluded. The window is under two years, so this chapter cannot describe long-run change in how people reach the mountains.
Chapter 5
Millions of visits
Reported visitation across NSW national parks
Visitation figures are survey-based estimates published by NSW National Parks and Wildlife Service and count visits, not unique people.
NSW publishes visitation estimates for its national parks. The chart below ranks the most visited parks in the most recent reporting period, which puts the Blue Mountains in the context of the wider state estate.
Most visited NSW national parks
Chapter 7 · 2019–2025
Where things go wrong
Search and rescue records here are compiled from news reports. They are indicative, not a complete official incident register.
News-derived incidents only. 2026 is a part year, so it is not offered here.
Where reported rescue incidents happen
Fire on the landscape
Sixty-two recorded fire years, mapped as they were mapped.
The outdoor network
The tracks, lookouts and visitor areas recorded inside the park today
Chapter nine
Organised outdoor life
Clubs, races and businesses recorded around the mountains
Three researched datasets sit behind this chapter: a catalogue of Australian outdoor organisations, an Australian trail running event/edition/race family, and an experimental sample of Blue Mountains business history. All three are research compilations rather than official registers, so they describe what has been identified in sources, never everything that existed. Locations here come from the datasets' own town and location fields and from flagged Blue Mountains relationships; they have not been promoted to verified canonical place matches.
The park is also a place people organise around. Clubs walk it on weekends, races run through it, and the towns along the highway have made a living from visitors for well over a century. The records below come from research compilations rather than official registers, so they show what has been identified — a floor, not a total.
Clubs and organisations
Organisations with a documented Blue Mountains connection
The organisations, and when sources say they began
How to read this. This is a catalogue of organisations that research identified, not a census of clubs. Twenty Blue Mountains-linked organisations does not mean twenty clubs have ever used the mountains, and eight of them have no recorded founding year, so no growth curve can be drawn from these dates.
Organised trail running
Finishers in the Six Foot Track Marathon, by recorded edition
How much of each event's history is documented
How to read this. The trail running records are a strong catalogue of events and a weak history of them. Event, edition and race records are linked, but most editions carry no participation figure, and the datasets' own location and national-park fields are research candidates that have not been confirmed against the canonical place library. Nothing here counts runners inside Blue Mountains National Park.
The towns that serve the visitors
Businesses identified in historical sources, by town
Experimental dataset. These are businesses identified in historical sources collected for this project. It is not a business register, not all historical Blue Mountains businesses, and not a count of businesses operating in any year. Opening years carry a confidence rating and some are recorded only to the month or year found in a source.
Sources: Outdoor Clubs Australia (researched catalogue), the Australian Trail Running event/edition/race family with its own source records, and the experimental Blue Mountains business history sample. Full coverage, licence and limitation notes are listed in Sources & methodology.
A landscape alive
What has been recorded across the Blue Mountains landscape — and how has our picture of its biodiversity changed over more than four decades?
Chapter ten
The Blue Mountains today
What these records do and do not tell us
Put the chapters side by side and a picture forms, though not a single story. Around 78,000 people live in the eight statistical areas along the ridge. Three weather stations have recorded swinging rainfall and their own temperature records since 1990. Millions of visits a year are reported for the Blue Mountains branch of the park service. Fire has returned to the landscape repeatedly, and in 2019-20 the mapped footprints were larger than in any other year in the record. Search and rescue incidents appear in the news throughout.
None of these records explains another. They come from different organisations, cover different periods and different geographies, and this story does not claim a cause where the data only shows a coincidence in time.
Each chapter names the exact geography and period it covers. Figures from different chapters are not directly comparable unless they share both.
Every figure in this story is traceable: the section below lists each source behind it, what it covers, and the limitations we know about.
Sources & methodology
Every figure in this story is produced live from the datasets listed below. Geographic matching uses the canonical place library, so a Census area, a local government area and a national park are never treated as the same place.
23 datasets, each listed once with the calculations and limitations that apply to it.
Used in: The people around the park
What was calculated
- Sum of Tot P P by census year
Filters applied
- sa2 code is one of 124011449, 124011450, 124011451, 124011452, 124011453, 124011454, 124011455, 124021456
- Chapter period: Census 2011, 2016 and 2021
Known limitations
- Statistical area boundaries can change between Census years. For these eight areas the ABS correspondence from 2016 to 2021 is a one-to-one match rated "Good", so the counts are comparable across 2011, 2016 and 2021.