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16 Week Ultimate 50-Mile Ultra-Marathon Training Plan

Endurance Athlete Roadmap
February 25, 2025
10 min read
16 Week Ultimate 50-Mile Ultra-Marathon Training Plan

16 Week Ultimate 50-Mile Ultra-Marathon Training Plan

Embarking on a 16-week 50-mile ultramarathon training plan is an ambitious endeavor, demanding physical prowess and mental fortitude. This comprehensive guide will illuminate the intricacies of such a rigorous regimen, providing invaluable insights to optimize your preparation.

Prerequisites for This Plan

Before starting, you should have:

  • Completed at least one marathon
  • Base of 40+ miles per week
  • Experience with back-to-back long runs
  • Understanding of ultra nutrition needs
  • Training Plan Philosophy

    Volume Over Speed

    Ultra running isn't about pace—it's about time on feet and durability.

    Specificity Matters

    Train on terrain similar to your race (trails, hills, elevation).

    Recovery Is Training

    Your body adapts during rest, not during workouts.

    16-Week Overview

    Phase 1: Base Building (Weeks 1-4)

    Weekly mileage: 40-50 miles

    Focus:

  • Establish consistent weekly structure
  • Two long runs per week (Saturday + Sunday)
  • Easy pace for most runs (conversational)
  • Introduce weekly strength training
  • Phase 2: Building Volume (Weeks 5-8)

    Weekly mileage: 50-60 miles

    Focus:

  • Increase long run duration
  • Practice race nutrition
  • Back-to-back weekend long runs
  • Night running practice (if applicable)
  • Phase 3: Peak Training (Weeks 9-12)

    Weekly mileage: 60-70 miles

    Focus:

  • Longest training runs (4-5 hours)
  • Race simulation weekends
  • Finalize nutrition strategy
  • Mental toughness training
  • Phase 4: Taper (Weeks 13-16)

    Weekly mileage: Decreasing to race week

    Focus:

  • Reduce volume, maintain some intensity
  • Perfect race day logistics
  • Rest and recovery
  • Mental preparation
  • Key Weekly Structure

    Monday: Rest or easy recovery run

    Tuesday: Easy run (6-10 miles)

    Wednesday: Hill/terrain specific work

    Thursday: Easy run + strength

    Friday: Rest or very easy 3-4 miles

    Saturday: Long run (building to 4-5 hours)

    Sunday: Medium-long run (90-120 minutes)

    Ultra-Specific Training Elements

    Back-to-Back Long Runs

    The secret to ultra success—training on tired legs:

  • Saturday: 4-5 hour long run
  • Sunday: 90-120 minute follow-up run
  • Night Running

    If your race goes overnight:

  • Practice running with headlamp
  • Train in darkness monthly
  • Understand how fatigue affects night performance
  • Nutrition Strategy

  • Aim for 200-300 calories/hour during race
  • Practice eating REAL food (not just gels)
  • Train your gut—it's a muscle too
  • Race Day Essentials

    Mandatory Gear (typical)

  • Hydration system
  • Emergency blanket
  • Headlamp with extra batteries
  • First aid basics
  • Extra layers
  • Pacing Strategy

  • Start conservative (slower than you think)
  • Walk all uphills from the start
  • Run the flats and downhills
  • Manage your effort, not your pace
  • Ready for the ultimate challenge? Book a consultation to get personalized guidance for your 50-mile ultra journey. Let's make sure you reach that finish line strong.

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