Ultramarathon Training: How to Prepare for Your First Ultra

Summary: A comprehensive guide to training for your first ultramarathon, covering distance selection, training principles, nutrition strategy, gear essentials, and mental preparation for running beyond 26.2 miles.

Read time: 11 min

An ultramarathon is any race longer than the traditional marathon distance of 26.2 miles. For some, that means a 50K (31 miles). For others, it's 100 miles through mountains. Whatever the distance, ultras represent a different kind of running—one where finishing matters more than pace, and mental fortitude often trumps physical fitness.

Choosing Your First Ultra

Recommended Starting Distances

50K (31 miles): The most common entry point. Only 5 miles longer than a marathon, but usually on trails with more forgiving pacing expectations.

50 miles: A significant step up that requires dedicated ultra-specific training. Achievable for experienced marathoners with 6-12 months of preparation.

What to Look For

Trail vs. road: Most ultras are on trails, which are easier on the body but require different skills and gear.

Elevation gain: A flat 50K is very different from one with 8,000 feet of climbing. Start modest.

Aid station frequency: Races with aid every 4-6 miles are more forgiving than those with 10+ mile gaps.

Cutoff times: Generous cutoffs (12+ hours for a 50K) reduce pressure on your first attempt.

Time of year: Avoid extreme heat or cold for your first ultra.

Prerequisites

Before committing to ultra training, you should have:

Completed at least one marathon
Consistent running history (1-2 years minimum)
Experience with long runs of 20+ miles
Basic trail running skills (if your race is on trails)
Ability to train 8-15 hours per week

Training Philosophy

The Fundamental Shift

Ultra training differs from marathon training in key ways:

Time on feet > pace: The goal is teaching your body to move forward for many hours, not running fast.

Walking is a tool: Even elite ultrarunners walk the steep uphills. It's strategy, not weakness.

Back-to-back long runs: Training consecutive long days simulates running on tired legs.

Nutrition becomes critical: You can't fake 6+ hours of running without practiced fueling.

Training Principles

Progressive overload: Gradually increase weekly volume and long run duration.

Specificity: Train on terrain similar to your race.

Recovery: More volume means more recovery needs. Sleep and easy days are mandatory.

Practice everything: Gear, food, pacing strategies—nothing new on race day.

Sample 16-Week 50K Training Plan

Phase 1: Base Building (Weeks 1-4)

Build consistent weekly mileage with one long run per week.

Weekly structure:

4-5 running days
1 long run (starting at 14-16 miles)
1-2 easy/recovery runs
1 moderate "quality" day (tempo or hills)
1-2 rest days

Week 1: 35 miles total, long run 15 miles Week 2: 38 miles, long run 16 miles Week 3: 42 miles, long run 18 miles Week 4 (recovery): 30 miles, long run 12 miles

Phase 2: Building Volume (Weeks 5-8)

Introduce back-to-back long runs. This teaches running on fatigued legs.

Back-to-back structure:

Saturday: Longer run (18-22 miles)
Sunday: Medium-long run (10-14 miles)

Week 5: 42 miles, back-to-back 18/10 Week 6: 45 miles, back-to-back 20/12 Week 7: 48 miles, back-to-back 22/12 Week 8 (recovery): 32 miles, single long run 14 miles

Phase 3: Peak Training (Weeks 9-12)

Highest volume weeks. Longest single runs.

Week 9: 48 miles, back-to-back 20/14 Week 10: 52 miles, back-to-back 24/14 (peak) Week 11: 50 miles, back-to-back 22/12 Week 12 (recovery): 35 miles, long run 15 miles

Phase 4: Sharpening & Taper (Weeks 13-16)

Reduce volume while maintaining some quality.

Week 13: 42 miles, single long run 20 miles Week 14: 35 miles, long run 15 miles Week 15: 25 miles, long run 10 miles Week 16: 15 miles + race (easy runs only)

Long Run Strategy

Duration Over Distance

Ultra long runs should be time-based, not distance-based. Running 4 hours matters more than covering a specific number of miles.

Pacing

Long runs should be very slow—often 2+ minutes per mile slower than marathon pace. If you're breathing hard, you're going too fast.

Heart rate guidance: Stay in Zone 2 (60-70% of max heart rate) for most of your long runs.

Walking and Hiking

Practice walking during long runs:

Walk all steep uphills
Walk while eating/drinking
Walk when heart rate spikes

This isn't training failure—it's practicing race strategy.

Terrain Specificity

Train on terrain similar to your race. If your ultra has 6,000 feet of climbing, your training should include significant vertical gain. Flat road long runs don't prepare you for mountain courses.

Nutrition for Ultras

The Fundamental Challenge

Your body can only store about 2,000 calories of glycogen—enough for roughly 2-3 hours of running. Ultras last 6-20+ hours. You must eat while running.

Calorie Targets

Goal: 200-300 calories per hour after the first hour

Sources:

Gels and chews (convenient, predictable)
Real food (sandwiches, potatoes, fruit, candy)
Liquid calories (sports drink, Coke, broth)

The Real Food Factor

Unlike marathons where gels suffice, ultras often require real food. Your stomach rebels against endless sweet gels. Practice eating solid food during long training runs:

Peanut butter sandwiches
Boiled potatoes with salt
Bananas
Pretzels
Pizza (yes, really)

Hydration and Electrolytes

Fluid: 16-24 oz per hour, adjusted for heat and sweat rate

Electrolytes: Essential for efforts over 4 hours. Sodium is most important—aim for 500-1000mg per hour through sports drink, salt tabs, or salty food.

Testing Your Nutrition

Every long run over 2 hours should include nutrition practice. By race day, you should know exactly what your stomach can handle at what intervals.

Essential Gear

Footwear

Trail shoes: Most ultras require trail-specific footwear with aggressive tread and protection.

Consider two pairs: Some runners change shoes at aid stations to give feet a break.

Size up: Feet swell during ultras. Shoes that fit perfectly for a marathon may be too tight after 40 miles.

Hydration Systems

Hydration vest: Required for most ultras. Carries water, food, and mandatory gear.

Soft flasks vs. bladder: Soft flasks in the front are easier to monitor and refill.

Capacity: 1.5-2 liters minimum between aid stations.

Clothing

Layering: Weather changes over 6+ hours. Carry a lightweight jacket.

Chafe prevention: Longer time = more chafing. Body Glide on all friction points.

Comfortable everything: Seams, tags, and fit issues become torture over many hours.

Race-Day Essentials

Most ultras have mandatory gear lists. Common requirements:

Headlamp (even for day races—you might be out after dark)
Emergency blanket
Whistle
Basic first aid
Phone
Course map

Mental Preparation

The Mind Game

Ultras are more mental than physical after a certain point. Your body will hurt. The question is whether you can keep moving anyway.

Breaking It Down

Don't think about the total distance. Think about getting to the next aid station, the next mile marker, the next landmark.

"I just need to make it to mile 20" is manageable. "I have 30 more miles to go" is overwhelming.

Low Points Are Normal

Every ultrarunner experiences terrible patches—moments where everything hurts and quitting seems reasonable. These pass. Keep eating, keep drinking, keep moving. The next high follows the low.

Mantras

Simple phrases for dark moments:

"Relentless forward progress"
"Keep moving"
"One step at a time"
"Pain is temporary, finishing is forever"

Find what works for you.

Visualization

Before the race, visualize:

Feeling strong in the early miles
Managing the hard middle section
Pushing through low points
Crossing the finish line

Race Day Execution

Pre-Race

Night before:

Lay out all gear and drop bags (if applicable)
Charge headlamp and watch
Eat early, hydrate well, sleep as much as possible

Morning:

Eat 3+ hours before start
Arrive early for check-in and gear setup
Use the bathroom multiple times
Start easy, no matter how good you feel

Pacing Strategy

First third: Slower than you think. Banks open late in ultras—you can't "bank time" by going out fast.

Middle third: Steady, consistent effort. This is where races are made or broken.

Final third: Whatever you have left. Walk more if needed. Just keep moving.

Aid Station Management

Have a system: Come in, refill water/food, address any issues, leave. Don't linger.

Sit only if necessary: Getting up from a chair at mile 35 is brutally hard.

Eat and drink: This is your chance to restock. Take advantage.

Change socks/shoes if needed: If feet are suffering, take 5 minutes to address it.

Problem Solving

Blisters: Tape them if possible. Deal with them at aid stations if severe.

Stomach issues: Slow down, switch to bland food, reduce intake temporarily.

Chafing: Apply lubricant at every opportunity.

Fatigue: Eat, drink, walk for a bit, reassess.

The "Quit Point"

Almost everyone has a moment where quitting seems reasonable. Unless you're actually injured or medically compromised:

Eat something
Walk for 10 minutes
Reassess

Most "quit points" pass. If you still want to quit after eating and moving for 20 minutes, then consider it. But don't decide in the moment.

Recovery

Immediate Post-Race

Keep moving: Walk for 10-15 minutes, even though you want to collapse.

Eat and drink: Whatever sounds good. Your body needs calories.

Assess damage: Blisters, chafing, muscle soreness—note what needs attention.

Days 1-7

Days 1-2: Very minimal activity. Walking only.

Days 3-5: Light walking, gentle stretching if desired.

Days 5-7: Easy 10-20 minute jogs if legs feel ready.

Full Recovery Timeline

50K: 2-3 weeks before resuming normal training
50 miles: 3-4 weeks
100K/100 miles: 4-6+ weeks

Don't rush back. Ultra damage goes deeper than marathon damage.

Common Mistakes

Training Too Hard

Long runs should be truly easy. Running long runs at marathon pace leads to injury and burnout.

Neglecting Walking Practice

If you never walk in training, walking in the race feels like failure. Practice it.

Ignoring Nutrition

"I'll figure out food on race day" is a recipe for disaster. Practice eating and drinking on every long run.

Starting Too Fast

The first 10 miles feel easy because adrenaline masks reality. Slow down.

Giving Up Too Early

Most "I can't go on" moments pass with food, rest, and patience. Don't quit when you're just having a bad patch.

Building Toward Longer Distances

After your first 50K, you might wonder: what's next?

Progression

50K → 50 miles: Allow 6-12 months of consistent training between.

50 miles → 100K: Similar timeline. Focus on building comfort at longer durations.

100K → 100 miles: The big jump. 100-mile training is its own discipline, requiring running through the night and managing sleep deprivation.

What Changes

Longer isn't always harder: Many ultrarunners find 100 miles easier than 50 because the pace is necessarily slower. The challenge shifts from physical intensity to mental endurance and logistics management.

Crew and pacers: Longer ultras often allow crew (support at aid stations) and pacers (running companions for later miles). These become important.

Drop bags: You can leave gear and supplies at specific aid stations along the course.

The bottom line: Training for an ultramarathon requires patient base-building, practicing nutrition and walking, and developing the mental fortitude to keep moving when everything hurts. Start with a 50K, train consistently for 16-20 weeks, and remember: in ultras, the runner who finishes is the one who never stopped moving forward.