What is the best first ultra marathon distance?

For most runners, a 50K is the best first ultra marathon distance. It is about 31 miles, so it is only about 5 miles longer than a marathon, but it teaches the key ultra skills: slower pacing, trail effort, fueling, walking hills, and staying patient.

How long does it take to train for an ultra marathon?

A runner with a steady base can often train for a first 50K in 12 to 16 weeks. A 50 mile race usually needs 16 to 24 weeks. A 100K or 100 mile race usually needs a longer build and should not be rushed, especially if the course has mountains, heat, altitude, or night running.

How many carbs should you take during an ultra marathon?

The International Society of Sports Nutrition position stand for single stage ultra marathon training and racing recommends 150 to 400 calories per hour, including 30 to 50 grams of carbohydrate per hour, plus small amounts of protein for longer events. Some runners train their gut to tolerate 60 to 90 grams of carbohydrate per hour, but this should be practiced in training and not tried for the first time on race day.

Can you walk during an ultra marathon?

Yes. Walking is normal in ultra running. Many runners power hike steep climbs from the start, walk through aid stations, and use short walk breaks to keep their effort controlled. In many trail ultras, smart walking is part of good pacing.

What gear do you need for ultra running?

The basics are trail shoes that match the course, a hydration vest or belt, bottles or soft flasks, food you have practiced with, anti chafe protection, weather layers, and a watch with enough battery for your expected finish time. If the race includes darkness, you also need a headlamp and often a backup light. Always check the race's mandatory gear list.

Guide To Ultra Running In 2026: Training, Fueling, Gear And First Race Tips

Q: What is ultra running?

Ultra running is running any race or organised event longer than the marathon distance of 26.2 miles, or 42.195 km. The most common ultra marathon distances are 50K, 50 miles, 100K, and 100 miles, but there are also timed events, backyard ultras, stage races, and multi day events.

Q: How many miles per week do you need for a 50K?

Many recreational runners can prepare for a first 50K with a peak of about 35 to 50 miles per week, depending on their background, race terrain, injury history, and time available. Time on feet, terrain practice, and consistency matter more than chasing one exact mileage number.

Ultimate Guide to Ultra Running in 2026

Ultra running sounds extreme from the outside, but most first timers do not fail because they are not tough enough. They struggle because they treat an ultra like a longer marathon. It is not just a longer marathon.

An ultra marathon is any race longer than the marathon distance of 26.2 miles, or 42.195 km. The usual starting point is a 50K, which is about 31 miles. From there, runners move into 50 mile races, 100K races, 100 mile races, timed events, backyard ultras, and multi day races.

This guide is written for runners who are curious about their first ultra, but it also works if you are moving from 50 miles to 100K. The goal is simple: help you choose the right race, train without breaking down, fuel before you fall apart, and finish.

Trail runner training for an ultra marathon on a quiet path

Quick answer

Best first ultra: a 50K with a generous cutoff, good aid stations, and terrain similar to where you train.
Training focus: consistency, time on feet, trail practice, fueling practice, and patient pacing.
Weekly volume: many first 50K runners peak around 35 to 50 miles per week, but terrain and durability matter more than a perfect number.
Long runs: one strong weekly long run is enough for many 50K runners. Back to back long runs become more useful as the race gets longer.
Fueling: start with 30 to 50 grams of carbs per hour, then train your gut toward more if your race is long and your stomach tolerates it.
Walking: walking hills is normal. In many ultras, smart walking is part of racing well.

Jump to:

Start Here Choose a Distance Training Sample Weeks Fueling Pacing Gear Mental Game Recovery FAQ Last updated: June 2026

The honest starting point

Are You Ready to Train for an Ultra?

You do not have to be fast to run an ultra. You do need to be consistent. A runner who has been running 4 to 5 days per week for months is usually in a better place than a runner who has one big long run every few weeks and then disappears.

A marathon helps because it teaches pacing, fueling, patience, and problem solving. But it is not a strict requirement for every runner. Some trail runners move from half marathons to 25K trail races, then to 50K. What matters most is your recent training history and whether your body can handle repeated weeks of running.

A simple readiness check

You are probably ready to start a first 50K build if most of these are true:

You have been running consistently for at least 6 months.
You can run 4 days per week without your body falling apart.
Your long run is already 10 to 14 miles, or you can comfortably spend 2 hours on your feet.
You can slow down without turning every run into a race.
You are willing to practise fueling, walking hills, and carrying gear.

Do not rush the leap. If you are often injured, skipping weeks, or barely recovering from your current long runs, spend 8 to 12 weeks building consistency before starting an ultra plan. Ultra training rewards boring consistency more than heroic workouts.

Pick the right challenge

Ultra Marathon Distances Explained

The race you choose decides almost everything: how much you train, how much gear you need, how serious the fueling plan must be, and whether night running matters. A flat rail trail 50K and a mountain 50K can feel like completely different sports.

Choose your ultra distance

Best first ultra

50K: about 31 miles

A 50K is the best first ultra for most runners. It is close enough to a marathon to feel possible, but long enough to teach ultra skills. Expect slower pacing, more walking, and more focus on food than a road marathon.

Typical build: 12 to 16 weeks if you already run consistently.
Peak long run: often 20 to 24 miles, or 4 to 5 hours on feet.
Best first race: moderate trail, clear markings, friendly cutoff, regular aid stations.

The real step up

50 miles: about 80 km

A 50 miler is not just a longer 50K. You are out long enough for nutrition, stomach comfort, weather, foot care, and mental lows to become major factors.

Typical build: 16 to 24 weeks, depending on your base.
Key workouts: longer trail runs, downhill practice, and occasional back to back long runs.
Best first race: runnable terrain, strong aid stations, and a cutoff that does not force you to chase the clock all day.

A full day race

100K: about 62 miles

A 100K often includes late day fatigue, darkness, temperature changes, and bigger nutrition mistakes. This is where race planning matters as much as fitness.

Typical build: 20 to 24 weeks after a strong base.
Key workouts: race terrain, night running if needed, back to back long runs, and full gear practice.
Best first race: a well supported course with aid stations close enough that you are not carrying too much.

Do not wing it

100 miles: about 161 km

A 100 miler is a long project. You need fitness, but you also need problem solving. Feet swell. Stomachs turn. Lights fail. Weather changes. You may move through an entire night, and sometimes a second one.

Typical build: 24 weeks or more, usually after shorter ultra experience.
Key workouts: time on feet, back to back long runs, night running, hiking climbs, and gear changes.
Best first race: not the hardest mountain race you can find. Choose support and finish odds over bragging rights.

Need the distance details first? Read How Many Miles Is an Ultra Marathon? for a full breakdown of 50K, 50 miles, 100K, 100 miles, timed events, backyard ultras, and stage races.

Build the engine

How to Train for an Ultra Marathon

Ultra training is not about proving you can suffer in training. The best plan builds the body slowly, gives you enough race specific practice, and leaves you healthy enough to arrive at the start line.

The main ingredients are easy volume, one weekly long run, terrain practice, strength training, recovery weeks, and nutrition practice. For longer races, add back to back long runs, night running, and more hiking practice.

Build easy volume first

Most of your running should feel easy. For a first 50K, many runners do well with 4 to 5 runs per week. Add mileage gradually and use a lower volume week every few weeks so your body can absorb the work.

Use long runs for practice, not punishment

Your long run teaches pacing, fueling, shoes, socks, vest fit, and patience. Do not turn every long run into a race. If your race is on trails, train on trails as often as you can.

Add back to back long runs when the race is long enough

Back to back long runs are useful because the second day teaches you to move on tired legs. They are not needed every weekend, and they should not replace basic consistency. For many runners, every 2 to 3 weeks is enough during the specific phase.

Train the course you chose

A flat road runner can be very fit and still struggle on steep trails. Practice climbing, descending, technical footing, heat, cold, mud, sand, or night running if your race includes those things.

Keep some faster running

Ultra running is mostly easy, but strides, short hills, tempo work, or controlled intervals can help running economy. Keep it controlled. The goal is to feel smoother, not to bury yourself.

Taper before race day

For most 50K and 50 mile races, reduce volume for 2 to 3 weeks before race day. Keep some short, relaxed effort in the plan, but stop chasing fitness. The final job is to arrive fresh.

Fact check: Recent coaching resources and 2026 trail running guidance agree on the same core idea: build a base first, then use a small number of key long runs or back to back weekends rather than one huge training run. Hal Higdon’s 50K plan peaks with long runs around 20 miles plus a 4 to 5 hour effort, while Trail Runner’s 2026 ultramarathon guide recommends base consistency before extending long runs.

Practical structure

Sample Ultra Training Weeks

These are not fixed plans. They are templates you can adjust around your life, terrain, recovery, and injury history. If you want a custom weekly plan, use the Running Training Plan Creator.

Goal	Runs per week	Peak week range	Key long run idea	Extra practice
First 50K	4 to 5	35 to 50 miles	20 to 24 miles, or 4 to 5 hours	Trail footing, fueling, hills, vest fit
50 miles	5 to 6	45 to 60 miles	24 to 30 miles, plus occasional back to back weekends	Real food, foot care, longer downhill running
100K	5 to 6	50 to 70 miles	Time on feet and back to back long runs	Night running, headlamp, full kit, weather layers
100 miles	5 to 6 plus hiking	60 miles or more for many runners	Several race specific weekends, not one monster run	Crew plan, drop bags, sleep lows, stomach problem solving

50K sample week

Four to five day structure

Easy run, strength, short hills or strides, easy run, long trail run, optional recovery jog, rest. This is enough for many first 50K runners if the weeks are consistent.

50 mile sample week

More time on feet

Easy run, strength, steady trail run, easy run, long run, second day easy trail run or hike, rest. The second day teaches you to move calmly when legs are tired.

100K sample week

Race specific practice

Easy run, hills, strength, medium trail run, rest, long trail run, back to back easy run or hike. Add a night run if your race will go into darkness.

100 mile sample week

Plan the problems

Easy running, climbing work, strength, midweek time on feet, back to back weekend, hiking, and gear practice. The goal is to solve race problems before race day.

Do not chase someone else’s mileage. A 45 mile week on trails with climbing can be harder than a 60 mile week on flat roads. Use mileage, hours, elevation, and fatigue together.

Fuel before you fall apart

Ultra Marathon Nutrition

Ultra nutrition is not about finding the perfect gel. It is about eating early enough, often enough, and simply enough that your stomach keeps working. Most runners who blow up in an ultra do not run out of toughness. They run out of fuel, fluids, patience, or all three.

The ISSN position stand on single stage ultra marathon training and racing recommends 150 to 400 calories per hour during racing, including 30 to 50 grams of carbohydrate per hour and 5 to 10 grams of protein per hour. It also recommends about 450 to 750 ml of fluid per hour, adjusted for heat, sweat rate, and tolerance.

You will also see the 60 to 90 grams of carbohydrate per hour target in endurance sports. That can work well for some runners, especially in faster or longer events, but it needs gut training. Do not jump from 20 grams per hour in training to 90 grams per hour on race day.

Race length	Carb target	Food style	Common mistake
50K	30 to 60 g per hour for most runners	Gels, drink mix, chews, banana, potatoes	Waiting until mile 18 to start eating
50 miles	30 to 70 g per hour, based on tolerance	Mix sweet fuel with simple real food	Using only sweet gels all day
100K	40 to 80 g per hour if trained	Drink mix, gels, rice, broth, sandwiches, potatoes	Ignoring savoury food until the stomach turns
100 miles	Individual plan, trained over months	Simple foods you can repeat for many hours	Eating too little early, then trying to catch up late

Do this

Start fueling in the first hour.
Practise your exact race foods on long runs.
Use a mix of drink, gels, and real food for long races.
Track sodium and fluids in hot weather.
Keep aid station choices boring and familiar.

Avoid this

Trying new foods on race day.
Drinking large amounts of plain water without sodium.
Standing around too long at aid stations.
Assuming caffeine will fix poor fueling.
Copying an elite runner’s plan without testing it.

Simple long run test: On your next long run, set a timer for every 25 to 30 minutes. Eat before you feel hungry. If your stomach gets upset, write down what you ate, how fast you ran, how hot it was, and how much you drank. That is how you build a race plan.

Slow is a skill

Ultra Marathon Pacing and Walking

Ultra pacing is mostly about restraint. If the first hour feels exciting, you are probably going too fast. If the first climb feels easy, you should still consider hiking it. You are trying to keep the effort smooth enough that you can keep making good choices later.

A good first ultra pacing plan

First third: hold back more than you think you need to.
Middle third: keep eating, keep drinking, and stay relaxed.
Final third: solve the next problem, then the next one.
Hills: hike early if hiking saves energy.
Aid stations: move with purpose. Refill, eat, thank volunteers, leave.

Walking is not failure. In ultra running, walking can be the reason you finish. Power hike steep climbs, walk while eating, and use short walk breaks to lower heart rate before things spiral. The skill is knowing when walking is a strategy and when it is the result of starting too fast.

Get durable

Strength Training for Ultra Runners

Strength training helps make your body more durable for long descents, uneven trails, late race form breakdown, and repeated weekly mileage. It does not need to be fancy. Two short sessions per week are enough for many runners.

Lower body strength

Split squats, step downs, Romanian deadlifts, calf raises, and hip bridges.

Trail stability

Lateral band walks, single leg balance, side planks, and controlled downhill practice.

Core and posture

Planks, dead bugs, carries, and anti rotation work to keep form together late.

How often

Two sessions per week early in the build. One shorter session during the biggest race specific weeks.

Fact check: A 2024 systematic review found that strength training can improve running economy in middle and long distance runners. For ultra runners, the practical goal is not bigger legs. It is better control when tired.

Gear that matters

Ultra Running Gear List

Ultra gear should solve problems, not create them. Train with everything you plan to carry. A vest that feels fine for 45 minutes can rub badly after 5 hours. A shoe that feels perfect on roads can feel unstable on roots and rocks.

Gear	Why it matters	When it becomes essential
Trail shoes	Grip, protection, and stability on uneven ground	Any trail ultra
Hydration vest or belt	Carries fluid, food, jacket, phone, and mandatory items	Most trail ultras and hot races
Soft flasks or bottles	Make fluid and electrolyte tracking easier	Any race with aid stations spaced far apart
Headlamp	Lets you run safely in darkness	Any race that may start or finish in the dark
Anti chafe product	Prevents small rubs from becoming race ending problems	Every ultra
GPS watch	Tracks time, distance, battery, route, and effort	Longer races, navigation routes, and time cutoffs
Weather layers	Protects against rain, wind, cold, and mountain weather changes	Mountain races, night races, shoulder season races

For product help, see our Running Shoe Finder, best watches for ultra runners, and best headlamps for running.

The part nobody can do for you

Mental Preparation for Ultra Running

Every ultra has low points. You may feel amazing, then terrible, then fine again. That swing is normal. The mistake is treating every bad patch like proof that the day is over.

Run aid station to aid station

Do not think about the whole race. Think about reaching the next aid station, then the next one. Small goals keep the brain calm.

Name the problem

Are you hungry, thirsty, hot, cold, lonely, bored, scared, or going too hard? A named problem is easier to fix than a vague feeling of panic.

Have a low point plan

When things go bad, eat something simple, sip fluid, walk for 5 minutes, and reassess. Many bad patches pass if you keep moving calmly.

Know why you signed up

Your reason does not need to be dramatic. It just needs to be real enough to matter when the race stops being fun.

After the finish

How to Recover After an Ultra Marathon

Ultra recovery depends on distance, terrain, heat, muscle damage, sleep loss, and how hard you pushed. A first 50K may need several easy days before light running feels good again. A 100 miler can take weeks before normal training makes sense.

In the first few days, focus on sleep, gentle walking, real meals, fluids, and foot care. Do not force a run just because your watch says you are recovered. Your legs, tendons, gut, and immune system all need time.

A simple recovery timeline

First 24 hours: eat, drink, sleep, clean feet, walk gently.
Days 2 to 4: easy walks, mobility, no hard training.
Days 5 to 10: short easy runs only if soreness is low and sleep is normal.
After longer ultras: wait longer before workouts. A 100 mile race may need several weeks.

Recovery rule: If you are limping, unusually tired, not sleeping well, or feeling flat, you are not ready for workouts yet. Easy movement is fine. Training can wait.

Ready to choose a race?

Find an Ultra Marathon That Fits Your Training

Do not pick the hardest race first. Use our race finder to compare popular ultra marathons by distance, region, month, and difficulty.

Find Popular Ultra Marathons

Common questions

Ultra Running FAQ

What is ultra running?

Ultra running is running any race longer than the marathon distance of 26.2 miles, or 42.195 km. The most common ultra distances are 50K, 50 miles, 100K, and 100 miles.

What is the best first ultra marathon?

A 50K is the best first ultra for most runners. Choose a race with moderate terrain, a generous cutoff, clear markings, and good aid stations. A local race is often better than a famous race because it is easier to train for the conditions.

Do you need to run a marathon before an ultra?

You do not have to run a marathon first, but it helps. A marathon teaches pacing, fueling, long run patience, and race day problem solving. Some trail runners build through 25K and 30K trail races instead, then move to 50K.

How many miles per week do you need for a 50K?

Many first time 50K runners peak around 35 to 50 miles per week, but there is no perfect number. Terrain, elevation, long run duration, recovery, and injury history matter. A consistent runner at 40 miles per week may be better prepared than an inconsistent runner who peaks higher.

Should you do back to back long runs?

Back to back long runs are useful, especially for 50 miles and beyond. For a first 50K, they can help, but they are not magic. Start small and use them every few weeks rather than forcing big weekends before your body is ready.

How much should you eat during an ultra?

A practical starting point is 150 to 300 calories per hour for a 50K or 50 miler, and sometimes more for longer races. The ISSN ultra marathon position stand recommends 150 to 400 calories per hour, including 30 to 50 grams of carbs per hour. Some runners train up to 60 to 90 grams per hour, but you need to practise that in training.

Can you walk during an ultra?

Yes. Walking is normal. Many ultra runners hike steep climbs, walk while eating, and use short walk breaks to keep the effort controlled. Smart walking often leads to a better finish.

What should I buy first for ultra running?

Start with trail shoes that match your race, a hydration vest or belt, bottles or soft flasks, anti chafe product, and foods you can practise with. Add a headlamp if your race may include darkness. Check the race mandatory gear list before buying extra gear.

Related RunningGearLab guides

How Many Miles Is an Ultra Marathon? | Popular Ultra Marathons in 2026 | Best Watches for Ultra Runners | Best Headlamps for Running | Running Training Plan Creator

Fact checked sources: World Athletics marathon distance page; International Society of Sports Nutrition position stand on single stage ultra marathon training and racing; Trail Runner ultramarathon survival guide; Hal Higdon 50K ultramarathon plan; 2024 systematic review on strength training and running economy; 2025 Nutrients paper on metabolic and muscular strain in non stop ultramarathon running.