An ultramarathon is any footrace longer than the standard 42.195 km marathon, and New Zealand has become one of the world’s great places to run one. This guide explains what counts as an ultra, why Aotearoa’s terrain suits the sport so well, and how the country’s flagship events — from the Tarawera Ultra-Trail by UTMB to the Kepler Challenge — actually work. It then walks through the practical side a first-timer needs: how to build the training, how to fuel for many hours on your feet, what mandatory safety gear you must carry, how to choose shoes and a hydration vest, and the common mistakes that end most first attempts. Everything below is written for beginners, with each technical term explained the first time it appears.
Key Facts
- What counts as an ultra: any race longer than the 42.195 km marathon.
- Common distances: 50 km, 80 km, 100 km and 100 miles (161 km), plus timed and Backyard Ultra formats.
- Flagship NZ events: Tarawera Ultra-Trail by UTMB, Kepler Challenge, Taupō Ultra, Old Ghost Ultra, Northburn 100.
- Typical fuelling: 200–300 calories and 500–700 mg of sodium per hour.
- Mandatory gear: seam-sealed jacket, thermals, headlamp, survival blanket and whistle.
- Recovery: 4–6 weeks after a 100 km effort.
What is an ultramarathon?
An ultramarathon (often shortened to “ultra”) is any race longer than the 42.195 km marathon distance. In practice the sport is built around a handful of milestone distances: 50 km, 100 km, and the 100-mile (161 km) mark, with plenty of races landing in between at 80 km or 102 km. Most ultras in New Zealand are run on trails rather than roads, which changes the challenge completely — you are managing climbing, descending, footing and weather, not just pace.
If you are unsure where the line sits, our explainer on the ultramarathon distance breaks down each milestone in kilometres and miles. A 50 km trail race is the usual entry point: long enough to demand real preparation, short enough to finish in a single day.
Time-based and looped ultras
Not every ultra is measured in distance. Timed events ask you to cover as much ground as possible in 6, 12 or 24 hours. The fast-growing “Backyard Ultra” format is stranger still: runners complete a 6.706 km loop starting on the hour, every hour, until only one person can still finish a loop within the 60-minute window. That last runner is the sole official finisher; everyone else is recorded as a DNF (Did Not Finish).
Why New Zealand is a world-class ultra destination
New Zealand punches far above its size in the ultra world because of its terrain. A dense network of Great Walks, technical single-track (narrow trail wide enough for one runner) and dramatic elevation change means a race can cross native bush, river crossings and alpine ridgelines within a single course. The sport grew out of the country’s tramping (hiking) culture, and that heritage still shapes it: events lean heavily on volunteers, on “Leave No Trace” ethics, and on a supportive, low-ego atmosphere at aid stations.
The arrival of global circuits raised the local standard sharply. New Zealand now hosts events in the UTMB World Series — UTMB stands for Ultra-Trail du Mont-Blanc, the sport’s best-known race brand — where finishers earn “Running Stones” that enter them into the lottery for the World Series Finals in Chamonix, France. That single change brought professional timing, GPS tracking for safety and a steady stream of international elites to Kiwi start lines.
New Zealand’s iconic ultramarathon events
The New Zealand calendar holds several bucket-list ultras, each with its own personality. The four below are the ones most first-timers research first, and the comparison box that follows lays out their distances, timing and terrain side by side. For the wider picture across the year, the New Zealand trail running calendar lists confirmed dates for smaller races too.
Tarawera Ultra-Trail by UTMB
Held around Rotorua in mid-February (14–15 February in 2026), Tarawera is the country’s highest-profile ultra and the second race in the 2026 UTMB World Series. It runs through geothermal landscapes, native forest and lakeside trails, and in 2026 offers five distances: a 100-mile Miler (163 km), the T102 (102 km), a 50 km, a 21 km and a new 14 km option. Our dedicated Tarawera Ultramarathon guide covers the course and entry in detail.
Kepler Challenge
The Kepler Challenge is a 60 km mountain race on the Kepler Track circuit near Te Anau in Fiordland, run in early December (5 December in 2026). It starts and finishes at the Control Gates of Lake Te Anau and climbs to the alpine Luxmore Hut before returning. Because the course crosses conservation land, numbers are strictly capped and online entries famously sell out within minutes of opening. See our Kepler Challenge guide for the entry timing and elevation profile.
Taupō Ultramarathon
The Taupō Ultramarathon runs the Great Lake Trail on 17 October 2026, offering 100 km, 70 km and 50 km ultras plus a 24 km trail run, with the 100 km also available as a four-person relay. It is one of the few days a year the full Great Lake Trail can be run uninterrupted, including sections over private land. Full details are in our Taupō Ultramarathon course and entry guide.
Old Ghost Ultra and Northburn 100
For remote wilderness, the Old Ghost Ultra follows the historic Old Ghost Road for 85 km between Seddonville and Lyell in the Buller region of the West Coast, climbing about 2,700 m through native forest and tussock tops. For sheer difficulty, the Northburn 100 in Central Otago (21–22 March in 2026) is a dry, rocky high-country event whose 160 km miler packs in roughly 10,000 m of climbing across three loops — among the toughest in the Southern Hemisphere.
Event Comparison
| Event | Region | Signature distances | Typical timing | Terrain |
|---|---|---|---|---|
| Tarawera Ultra-Trail by UTMB | Rotorua | 163 km / 102 km / 50 km / 21 km / 14 km | Mid-February | Geothermal, native forest, lakeside |
| Taupō Ultramarathon | Lake Taupō | 100 km / 70 km / 50 km / 24 km | Mid-October | Great Lake Trail single-track |
| Kepler Challenge | Te Anau, Fiordland | 60 km | Early December | Alpine ridgeline, Great Walk |
| Old Ghost Ultra | Buller, West Coast | 85 km (approx. 2,700 m ascent) | February | Remote forest and tussock tops |
| Northburn 100 | Central Otago | 160 km / 100 km / 50 km | March | Dry, rocky high-country (approx. 10,000 m climb on the miler) |
The technical demands of trail ultras
Trail ultras ask for a wider skill set than road racing, where pace is usually steady and predictable. Two skills matter most. The first is “power hiking” — a fast, efficient walk used on steep climbs, where you lean into the hill and press a hand on each knee to help the legs push. Even elite runners power hike the steepest pitches on courses like the Kepler or Routeburn to keep their heart rate below the anaerobic threshold (the effort level at which the body can no longer clear fatigue by-products as fast as it makes them).
The second is technical descending, where foot placement on roots, rocks and loose ground decides both your speed and your injury risk. New Zealand adds its own surfaces: the loose volcanic pumice of the central North Island behaves nothing like the sharp scree of the Southern Alps. Because an ultra can last 15 to 30 hours, the body also has to become efficient at using fat as fuel while protecting the muscles through hundreds of thousands of foot strikes.
How to train for your first ultramarathon
Ultra training prioritises “time on feet” over raw speed. A typical build for a 100 km event runs about 20 weeks and centres on a large aerobic base — many low-intensity kilometres that teach the body to run efficiently for hours. Training must also be specific to your race: if you are targeting a rugged course like the Old Ghost Ultra, you need regular time on technical single-track carrying a loaded pack, not just flat road miles.
Why back-to-back long runs work
The signature ultra session is the “back-to-back” long run — for example 30 km on Saturday followed by 20 km on Sunday. Starting the second run on tired, under-recovered legs simulates the back half of a race far better than one very long run does, and it builds the mental resilience the distance demands. The table below shows how a typical build is phased.
| Training phase | Duration | Main focus |
|---|---|---|
| Base | 8 weeks | Aerobic capacity and consistency |
| Strength | 6 weeks | Hill repeats and weighted hikes |
| Peak | 4 weeks | Race-specific terrain, highest weekly volume |
| Taper | 2 weeks | Recovery and topping up glycogen stores |
Fuelling an ultramarathon
In an ultra your stomach is as important as your legs. Because the effort is steadier and lower than a road marathon, the body can usually digest “real food” alongside energy gels and drink mixes, and New Zealand aid stations are known for salted potatoes, sandwiches, fruit and even pizza. A common target is 200–300 calories per hour, taken consistently rather than in large gaps. Managing sodium (roughly 500–700 mg per hour in warm, sweaty conditions) helps prevent hyponatremia — a dangerous drop in blood-sodium levels caused by drinking a lot of plain water without replacing salt.
The savoury transition
After many hours of sweet gels most runners hit “flavour fatigue” and start to feel queasy. Switching to salty, savoury options such as broth or boiled potatoes restores sodium and settles the stomach. The key habit is “gut training”: rehearse your exact race-day food and drink during long training runs so your digestive system is used to working under stress. A calorie target is easier to plan with a tool like our running calorie calculator.
Mandatory gear and trail safety
Safety is the top priority for New Zealand organisers because alpine weather can turn violent within minutes. Most events publish a strict mandatory gear list, check it before the start, and often re-check at random points on course. Carrying the kit comfortably needs a well-fitted hydration vest that spreads the load without bouncing. The essentials below appear on almost every list.
| Category | Essential item | Why it matters |
|---|---|---|
| Clothing | Seam-sealed waterproof jacket | Protects against hypothermia in cold rain and wind |
| Safety | Survival blanket and whistle | Vital if you have to stop with an injury |
| Lighting | Headlamp (200+ lumens) with spare batteries | Navigating technical trail after dark |
| First aid | Compression bandage | Immediate treatment for a rolled ankle |
Choosing footwear and a hydration vest
New Zealand’s abrasive pumice, roots and mud reward trail-specific shoes. Look for aggressive lugs (the raised rubber studs on the sole) of about 5 mm or deeper for grip, and for 100 km-plus races choose more cushioning and a wider toe box to accommodate the foot swelling that happens over long hours. Pairing the right shoe with technical socks does more to prevent blisters than any single gadget — our guides to running socks and choosing a hydration pack go deeper on both.
The hydration vest is the second-most-important item after shoes. It must carry around two litres of fluid plus the mandatory safety gear without chafing or shifting, so fit is worth testing on long runs before race day. Anti-chafe balm belongs in every ultra kit bag.
The mental game: managing the “pain cave”
An ultra is as much a psychological event as a physical one. Almost every runner passes through several “lows” — the so-called “pain cave” — and the runners who finish are usually the ones who expected those lows and had a plan. The most reliable tactic is “chunking”: never think about the full 100 km, only about reaching the next aid station perhaps 10 km away, then reset and repeat. Focusing on small, controllable actions — drink, eat, watch your footing — keeps the mind off the total distance remaining.
It helps to remember that the sport sits on a long continuum of human endurance; the mindset ultra-runners rely on is the same one that carries polar and mountain adventurers, such as the explorer profiled on Wikipedia, through days of relentless effort. A simple mantra shared across the community sums it up: the low will not last forever.
Recovery after an ultra
Recovery from a long ultra takes weeks, not days. The first priority after finishing is rehydrating and taking on protein to begin repairing muscle. Many New Zealand runners follow a race with a soak in the geothermal hot springs around Rotorua or Taupō. After the first 48 hours, gentle “active recovery” such as easy walking or swimming promotes blood flow without adding stress. Crucially, the nervous system needs as much recovery as the muscles: energy levels commonly take a full four to six weeks to return to normal after a 100 km effort, so resist the urge to rush back into structured training.
Trail ethics and environmental care
Most New Zealand ultras run on Department of Conservation (DOC) land, and runners are expected to protect it. That means using the wash stations at trailheads to help stop the spread of kauri dieback (a soil-borne disease killing native kauri trees), carrying out all rubbish, and staying on marked trail to prevent erosion. A growing number of events are “cup-less”, meaning you carry your own collapsible cup so aid stations do not generate thousands of single-use plastics. These habits are why access to these trails continues.
Common mistakes first-time ultra-runners make
The errors that end most first attempts are predictable, which means they are avoidable. Watching for the ones below will do more for your finish rate than any extra training block.
- Starting too fast. The early kilometres feel easy; banking time now almost always costs far more later.
- Under-fuelling early. By the time you feel empty it is too late — eat and drink on a schedule from the first hour.
- Untested gear and food. A new pack, new shoes or a new gel on race day is how blisters and stomach trouble start. Rehearse everything.
- Refusing to walk. Power hiking the climbs is a tactic, not a failure; runners who walk smart usually pass those who don’t.
- Ignoring the weather brief. Mandatory gear exists because conditions change fast — carry it properly, not just to pass the check.
If you are still deciding whether to commit, our honest look at the odds of winning an ultramarathon puts field sizes and DNF rates in perspective — for most runners the real goal is simply to finish.
Final thoughts
An ultramarathon rewards patience more than talent. Success is measured less by finish time than by the discipline of the training months, the intelligence of your race-day plan, and the resilience you show when things go wrong — because on a long trail, something always does. Choose a realistic first distance, respect the mandatory gear, practise your fuelling, and treat the low points as temporary. Do that, and the finish line of a New Zealand ultra is one of the most rewarding sights in the sport.
Sources
Frequently Asked Questions
What is the minimum distance for an ultramarathon?
An ultramarathon is any race longer than the 42.195 km marathon distance. In practice 50 km is the most common entry-level distance, with 100 km and 100 miles (161 km) the next milestones.
How do I choose my first ultramarathon?
Pick a 50 km trail race with a generous cut-off time and manageable elevation, such as the Taupō Ultra 50 km or the Tarawera 50 km. A well-supported, well-marked course removes a lot of the risk from a first attempt.
What gear is mandatory for New Zealand ultras?
Lists vary by event, but you will almost always need a seam-sealed waterproof jacket, a thermal top and bottom, a headlamp, a survival blanket and a whistle. Organisers usually check this kit before the start and sometimes on course.
How many calories should I eat per hour?
Most ultra-runners aim for 200–300 calories per hour, taken steadily using a mix of gels, bars and real food. Practising your race-day fuelling on long training runs is the best way to avoid stomach trouble.
Is it okay to walk during an ultramarathon?
Yes. Even the world’s best runners walk the steepest climbs. “Power hiking” is a legitimate, efficient tactic that keeps your heart rate down and often makes you faster overall, not slower.
