How to Train for Your First 50k Ultra (+ Free Training Plan Framework)

So you've done it. You've entered your first 50km ultra, or you're hovering over the entry button wondering if its a good idea or not. Maybe it's UTA50 in the Blue Mountains, UTK in Kosciuszko, the Guzzler up in Brisbane, or the Great Ocean Trail Ultra along the Victorian coast. Either way, you're now asking the same question every first-time ultra runner asks me: how do I actually train for this thing?

I'm a running coach based in Sydney, and I've spent years helping runners get to the start line of their first 50km, and more importantly, to the finish line still moving, still smiling (mostly), and already planning their next one. This guide is the advice I give my own athletes, including a 16-week training plan framework you can use to structure your own build.

No fluff, no plan copied from a road marathon program. Just what works for Australian trails, Australian races, and real runners with jobs, families and a finite number of hours in the week.

What You're Actually Signing Up For

First, let's be clear about what a 50km trail ultra actually involves, because the number "50" undersells it.

A road marathon is 42.2km on smooth, graded tarmac. A 50km trail ultra is only 8km longer on paper, but it's a different sport. Take these races Aussie first-timers most commonly target:

UTA50 (Blue Mountains, NSW) 50km with around 2,400m of climbing, including the infamous Furber Steps at the finish. Cutoff is 14.5 hours.
UTK50 (Kosciuszko, NSW) 50km with around 1,400m of climbing in the high country. Cutoff is 13.5 hours.
The Guzzler (Brisbane, QLD) Event runs around 52km with roughly 2,100m of vert across Mt Coot-tha and the surrounding trail network.
Great Ocean Trail Ultra (Apollo Bay, VIC) Coastal single track along the Great Ocean Walk. The 45km is a brilliant first-ultra stepping stone, and the 100km relay legs give you a taste of the full course.

Notice the pattern: 2,000m+ of elevation gain is normal for an Australian 50k. That's the equivalent of running up and down the Sydney Tower Eye about eight times, on stairs, rocks and fire trail. Most first-timers will be out there for 7 to 10 hours.

This matters because it changes what training needs to look like. You're not training to run 50km fast. You're training to move efficiently over terrain, uphill and downhill, for the better part of a day and to eat, drink and problem-solve while you do it.

Are You Ready to Start 50k Ultramarathon Training?

You don't need to be an experienced trail runner to start training for a 50km ultra. But you do need a foundation. Before starting a 16-week build, I want to see a runner who can tick most of these boxes:

Running consistently for 6+ months 3 to 4 runs per week without regular injury interruptions.
A comfortable long run of 15–20km, ideally with some of that on trail.
Around 30–40km per week as a normal training load.
No current injuries that flare up when volume increases.

If you've run a road marathon or a trail half like the UTA22 or UTK30, you're in a great starting position. If you're further back than this, that's fine, it just means you need a longer runway. Spend 8–12 weeks building to this baseline first, then start the 50k-specific block. One of the biggest mistakes I see is runners trying to compress a 6-month journey into 12 weeks because they entered a race on a whim. The race will still be there next year; your Achilles might not forgive you this year.

How Long Do You Need to Train for a 50km Ultra?

For a runner with the baseline above, 16 weeks is the sweet spot for a first 50km build. It's long enough to progress your long runs safely and absorb a couple of interrupted weeks (you will get sick, travel for work, or have a niggle at some point), but short enough to hold focus and motivation.

Could you do it in 12 weeks? If your base is strong, yes. Would 20–24 weeks be better for a true beginner? Absolutely. But 16 weeks is the framework I'll give you below, because it fits the majority of the first-timers I coach.

Working backwards from your race also matters more than most runners realise. Entered UTA50 in May? Count back 16 weeks and your build starts in late January. Which means your biggest training weeks land in March and April, and your Christmas running just needs to maintain your base, not smash you. Doing The Guzzler in July? Your key block runs through autumn and early winter shorter days, so plan where your long runs fit before the block starts, not week to week.

The Training Week That Works

Here's the thing nobody tells first-time ultra runners: your training week won't look dramatically different from a solid marathon build. The magic isn't in exotic sessions. It's in consistency, terrain specificity (hills, hills and more hills), and a properly progressed long run.

A typical week in the middle of a 50k build for my athletes looks like this:

A few principles behind this structure:

Most of your running should be easy. Properly conversational and using the talk test. The majority of your weekly volume should be at an effort where you could chat the whole way. If every run is a medium-hard slog, you'll arrive at your biggest weeks already cooked. This is the single most common thing I fix when a new athlete joins me.

One quality session per week is enough. For a first 50k, hill repeats and hilly tempo runs give you far more return than track intervals. A session like 6–8 x 90 seconds uphill at a strong effort, jog down recovery, builds the climbing strength and economy you'll lean on for hours on race day.

The weekend double (long run Saturday, easy Sunday) is your secret weapon. Running 60–90 minutes on tired legs teaches your body and your head what the back half of an ultra feels like, without the injury risk of a single monster run. It's a gentler version of the back-to-back long runs that 100km runners use.

Total volume matters less than you think. Most of my first-time 50k finishers peak at 55–75km per week (or 6–9 hours, which is a better way to measure trail training). You don't need 100km weeks. You need consistent 50–70km weeks with the right long runs and enough vert.

The Long Run: Your Most Important Session

If you only get one thing right in your build, make it the long run progression. This is where the race is actually won or lost and it's where I see the most mistakes in both directions: runners who never go longer than 25km and get shocked on race day, and runners who smash out 45km training runs, get injured, and never make the start line.

Here's how I progress long runs for a first 50k:

Think in time, not distance. On trails, 30km might take you 4.5 hours. The training stimulus (and the fatigue cost) comes from time on feet, not the number on Strava. I build athletes towards a longest run of 4 to 5 hours for most first-timers that's somewhere between 30 and 38km on trail, and that's plenty.

You do not need to run 50km in training. You don't even need 40km. Race-day adrenaline, aid stations, fresh tapered legs and months of accumulated fitness will carry you through the final hours. The risk-to-reward of mega long runs in training is terrible for first-timers.

Progress, then absorb. Build your long run for 2–3 weeks, then step back. Something like 2hrs → 2:15hrs → 2:30hrs → 1:30 (down week) → 3hrs. The down weeks aren't lost fitness; they're where the fitness actually consolidates.

Make them specific. By the second half of your build, long runs should mimic your race: similar terrain, similar vert per kilometre, race pack, race shoes, race nutrition. If you're training for UTA50, that means stairs and sustained descents. For The Guzzler, punchy repeated climbs on fire trail. Running a flat 35km on the bay run is not the same session.

Practise eating from week one. Your gut is trainable, and it needs as many weeks as your legs. Aim for 40–60g of carbs per hour on every run over 2 hours, building towards 60–90g/hr on your longest runs. More first ultras are ruined by nutrition than by fitness, I'd put it at the number one cause of the death-march final 15km.

I've written more about why this session deserves reverence in Embracing the Long Run.

Vert: How Much Climbing Do You Need?

Here's a simple rule of thumb I give my athletes: in your bigger weeks, aim for weekly vert that's at least equal to your race's total vert, spread across the week. Training for UTA50's 2,400m? Your peak weeks should hit 2,000–2,800m of climbing. Guzzler's 2,100m? Similar story.

And a second rule for the long run itself: match the race's vert density. UTA50 is roughly 480m of climbing per 10km. If your long runs average 150m per 10km, race day will hurt in ways you haven't rehearsed. Especially the descents, which trash your untrained quads far more than the climbs trash your lungs.

What if you live somewhere flat? Plenty of my athletes train in Western Sydney, coastal towns, or regional areas without mountains. Options that work:

Repeat the hill you have. A 60m hill climbed 15 times is 900m of vert. Boring, but it works and ultras reward boredom tolerance anyway.
Stairs are gold, especially for UTA50. Find a long staircase, an apartment block, or a stadium.
Treadmill incline hiking. 30–45 minutes at 12–15% incline, walking with purpose, builds exactly the climbing strength you need. This is the most underrated session in ultra training.
Travel for key long runs. Two or three trips to real hills in the final 8 weeks, the Blue Mountains, Mt Coot-tha, the You Yangs, wherever your race-similar terrain is cover the specificity the local stuff can't.

One more thing on climbing: learn to hike now. Every runner at the front of a 50k power-hikes the steep stuff. Hiking is not failure; it's technique. Practise it in training with purpose, strong posture, hands on knees or poles if the race allows, and a pace that keeps your heart rate out of the red.

Free 16-Week 50k Training Plan Framework

Here's the framework I use to structure a first-timer's 16-week build. This isn't a rigid prescription it's the skeleton. Your job (or your coach's) is to hang the right sessions on it for your race, your terrain and your life.

It assumes the baseline we covered earlier: comfortable running ~35km/week with a 15–20km long run.

Phase 1 - Base (Weeks 1–4)

Goal: establish the weekly rhythm, build frequency, get onto trails.

Phase 2 Build (Weeks 5–8)

Goal: extend the long run, introduce weekly hill quality, start race nutrition practice.

Phase 3 - Race Specific (Weeks 9–13)

Goal: peak long runs, race vert density, full race rehearsal.

Phase 4 - Taper (Weeks 14–16)

Goal: shed fatigue, keep the engine ticking, arrive hungry.

Race day.

Three rules for using this framework:

The down weeks are non-negotiable. Runners love deleting them. Don't. They're where adaptation happens, and they're your insurance policy against the overuse injuries that end 50k campaigns in week 10.
Hours and vert are ranges for a reason. If you're a smaller-volume runner or older runner, live at the bottom of the ranges. Coming off a marathon block? The top end is available to you.
When life blows up a week, drop volume, never the long run, unless you're injured or sick. A 5-hour training week with a 3:30hrs long run beats a perfectly balanced 8-hour week with no long run.

The taper deserves its own conversation, most first-timers either don't taper enough or panic-train through it. I've covered exactly how to do it in Tapering for an Ultramarathon.

The 5 Mistakes I See Most Often in First 50k Builds

After coaching a lot of first-time ultra runners, the same handful of mistakes come up again and again. Here they are, so you can make original mistakes instead.

Running every run too hard. The classic. Easy days at "moderate" effort, quality days at "survival" effort, and a slow slide into staleness around week 9. If you can't hold a conversation on your easy runs, they're not easy. Slow down and watch everything else improve, I've written a whole piece on why running slow makes you faster.
Training on the wrong terrain. Forty flat road kilometres a week is marathon training with a trail race at the end of it. The race is run on stairs, rocks, roots and long descents, so, eventually, your training needs to be too. Descending in particular is a trainable skill that road running does exactly nothing for.
Leaving nutrition until race week. Buying gels at the expo and hoping is not a strategy. Your gut needs weeks of practice, the same as your legs. Train it on every long run, find what you can stomach at hour four (hint: it's probably not what tastes good at hour one), and lock your plan in three weeks out. Then nothing new on race day.
No strength work. Twenty minutes, twice a week: single-leg work, calf raises, step-ups, some core and plyometrics. That's it. The runners who do this survive the descents and the injury lottery of a volume build far better than the ones who "don't have time" and it's the cheapest performance insurance in ultra running.
Racing your training. Chasing Strava segments on Tuesday, smashing your mates' long-run pace on Saturday, turning every hill session into a time trial. Your training build is not the event. The fittest athlete on paper who arrives at the start line fatigued or injured loses to the slightly-less-fit athlete who arrives fresh, every single time.

What Race Day Actually Feels Like (So You're Not Surprised)

A quick reality briefing, coach to runner:

You will walk. A lot. So does everyone, including the podium. Plan your hike/run strategy in advance rather than discovering it mid-race. It's OK to practice this in training as part of the long run
There will be a low point. Usually somewhere between 30 and 40km. It's almost always fixable with food, a change of rhythm, and 20 minutes of patience. The runners who know the low is coming treat it as a phase; the ones who don't treat it as the end.
Start embarrassingly easy. If the first 10km feels too slow, you've paced it right. Every position you give up in the first hour comes back with interest in the last two.
Aid stations are checkpoints, not cafés. Have a routine: fill bottles, grab food, go. Minutes leak away fast when you're tired. Beware the chair!
The finish is worth all of it. There is nothing in road running like coming up the final climb (or stairs) of your first ultra knowing you've got it.

Race day prep and 6 things I wish I knew before my first race

FAQs: First 50km Ultra Training

Can a beginner train for a 50km ultra? Yes, with an honest runway. If you're new to running entirely, give yourself 9–12 months: build to consistent 35–40km weeks first, then run the 16-week block. If you've got a year of consistent running or a marathon behind you, 16 weeks is enough.

How many kilometres a week do I need to run? Most first-time 50k finishers I coach peak between 55 and 75km per week, but hours (6–9 at peak) and vert are better targets than kilometres for trail training. Consistency across 16 weeks beats any single big week.

What's the longest run I should do before a 50k? Around 4.5–5.5 hours, or roughly 30–38km on trail, done about 4 weeks before race day. Running the full 50km in training adds injury risk for very little fitness return.

Do I need poles for my first 50k? For UTA50 and most Australian 50ks, no, many first-timers do fine without them, and some races restrict them anyway. Check your race's rules. If you do plan to use them, train with them for at least 6–8 weeks first.

Should I do a lead-up race? Ideally, yes. A trail half marathon or 25–30k around weeks 8–10 is a brilliant rehearsal for gear, nutrition, pacing and nerves, treated as a training day, not an all-out race.

Ready to Start Your 50k Journey?

You now have the framework. What most runners find hardest isn't understanding the plan, it's adapting it when real life happens: the calf that tightens in week 7, the work trip that lands on your biggest weekend, the confidence wobble three weeks out. That's the actual job of a coach.

If you want a structured, race-specific plan you can run yourself, my trail and ultra training plans are built exactly for races like UTA50, The Guzzler and the Great Ocean Trail Ultra. And if you want the full support a plan that adapts weekly to your training data, your terrain and your life, with a coach in your corner from week 1 to the finish line, that's what my online coaching is for.

Either way: pick your race, count back 16 weeks, and start. The trail's waiting, why are you?