18-Week Marathon Training Plan (Intermediate Level)

Plan Overview

Target Audience: Runners with 2+ years consistent running, 35-40 mpw base, completed at least one half marathon Goal: Marathon (26.2 miles) in 18 weeks Weekly Mileage: 16-68 miles (peak week 68) Experience Required: Comfortable running 90+ minutes continuously, solid aerobic base

If This Is More Volume Than You Want

This plan peaks at 68 miles in its biggest week. That is a real marathon build, and it sits at the top of the intermediate range rather than the middle of it. Every weekly total in this plan has been checked against the workouts actually listed underneath it, so the number above is the number you will run.

To run this plan at roughly 55 miles per week instead:

Trim 6-8 miles per week off the easy days only. Take a mile off two or three easy runs rather than a large chunk off one.
Do not cut the quality sessions (tempo, intervals, marathon-pace work). They are the reason the plan works.
Do not cut the long run by more than a mile or two. It is the other reason.
If the plan still feels like too much after that, you want the beginner version, not a trimmed version of this one. There is no shame in that and it will make you faster than limping through a plan that is over your head.

The volume is a dial. The easy/hard structure is not. See Training Principles and Injury Prevention.

Before You Start

Determine Your Current Fitness:
- Use recent half marathon time (preferred) OR
- Use 10K time for estimate
- Enter into McMillan or VDOT calculator
Know Your Training Paces:
- Easy: Conversational pace (Zone 2, 60-70% max HR)
- Marathon Pace (MP): Goal race pace (Zone 3, 70-80% max HR)
- Tempo: Comfortably hard (~10K pace, Zone 4, 80-90% max HR)
- Interval: Hard effort (~5K pace, Zone 5, 90-100% max HR)
Schedule Your Race:
- Pick your goal marathon for Week 18
- Optional: tune-up half marathon in Week 14
Medical Clearance:
- Marathon training is demanding
- Consult physician if you have any health concerns
- Build gradually, listen to your body

Training Philosophy

The marathon is won or lost in training. Success requires:

Strong aerobic base
Long run progression
Marathon pace familiarity
Smart recovery

Training Phases:

Weeks 1-8: Base building (focus on volume and aerobic development)
Weeks 9-14: Build phase (add quality, marathon pace work)
Weeks 15-17: Peak phase (race-specific training)
Week 18: Taper and race

Key Principle: The long run is king for marathon training. Everything else supports it.

The 18-Week Plan

Phase 1: Base Building (Weeks 1-8)

Week 1: Establish Base (41-45 miles)

Monday: Easy 6 miles
Tuesday: Easy 6 miles + 6x100m strides
Wednesday: Easy 5 miles
Thursday: Easy 6 miles
Friday: Rest or easy 4 miles
Saturday: Long run 13 miles easy
Sunday: Recovery 5 miles

Week 2: Build Volume (48 miles)

Monday: Easy 6 miles
Tuesday: Easy 7 miles + 6x100m strides
Wednesday: Easy 5 miles
Thursday: Easy 6 miles
Friday: Easy 4 miles
Saturday: Long run 14 miles easy
Sunday: Recovery 6 miles

Week 3: Continue Building (52 miles)

Monday: Easy 6 miles
Tuesday: Easy 7 miles + 8x100m strides
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 4 miles
Saturday: Long run 16 miles easy
Sunday: Recovery 6 miles

Week 4: Recovery Week (35 miles)

Monday: Rest
Tuesday: Easy 7 miles
Wednesday: Easy 5 miles + 6x100m strides
Thursday: Easy 6 miles
Friday: Rest
Saturday: Long run 12 miles easy
Sunday: Recovery 5 miles

Week 5: Build Again (54 miles)

Monday: Easy 7 miles
Tuesday: Easy 7 miles + 6x100m strides
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 4 miles
Saturday: Long run 17 miles easy
Sunday: Recovery 6 miles

Week 6: Continue Volume (56 miles)

Monday: Easy 7 miles
Tuesday: Easy 8 miles + 8x100m strides
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 4 miles
Saturday: Long run 18 miles easy
Sunday: Recovery 6 miles

Week 7: Peak Base Volume (59 miles)

Monday: Easy 7 miles
Tuesday: Easy 8 miles + 6x100m strides
Wednesday: Easy 6 miles
Thursday: Easy 8 miles
Friday: Easy 5 miles
Saturday: Long run 19 miles easy
Sunday: Recovery 6 miles

Week 8: Recovery Week (39 miles)

Monday: Rest
Tuesday: Easy 8 miles
Wednesday: Easy 5 miles + 6x100m strides
Thursday: Easy 7 miles
Friday: Rest
Saturday: Long run 14 miles easy
Sunday: Recovery 5 miles

Phase 2: Build - Add Quality & Marathon Pace (Weeks 9-14)

Week 9: Introduce Marathon Pace (55 miles)

Monday: Easy 7 miles
Tuesday: Easy 7 miles + 6x100m strides
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 4 miles
Saturday: MP Long Run - 18 miles (first 13 easy, last 5 at marathon pace)
Sunday: Recovery 6 miles

Week 10: Add Tempo Work (60 miles)

Monday: Easy 7 miles
Tuesday: Tempo - 2mi warmup + 5mi at tempo pace + 2mi cooldown = 11 miles
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 4 miles
Saturday: Long run 19 miles easy
Sunday: Recovery 6 miles

Week 11: Build Quality (63 miles)

Monday: Easy 7 miles
Tuesday: Tempo - 2mi warmup + 6mi at tempo pace + 2mi cooldown = 12 miles
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 5 miles
Saturday: MP Long Run - 20 miles (first 14 easy, last 6 at marathon pace)
Sunday: Recovery 6 miles

Week 12: Recovery Week (41 miles)

Monday: Rest
Tuesday: Easy 8 miles
Wednesday: Easy 5 miles + 6x100m strides
Thursday: Easy 7 miles
Friday: Rest
Saturday: Long run 15 miles easy
Sunday: Recovery 6 miles

Week 13: Add Intervals (62 miles)

Monday: Easy 7 miles
Tuesday: Intervals - 2mi warmup + 6x1200m at 5K pace w/3min rest + 2mi cooldown = 11 miles
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 5 miles
Saturday: MP Long Run - 20 miles (first 13 easy, middle 6 at MP, last 1 easy)
Sunday: Recovery 6 miles

Week 14: Recovery + Optional Half Marathon (42 miles OR 38 + race)

Monday: Rest
Tuesday: Easy 8 miles
Wednesday: Easy 6 miles + 6x100m strides
Thursday: Easy 7 miles
Friday: Rest
Saturday: OPTIONAL: Half Marathon race OR long run 16 miles (10 easy, 6 at MP)
Sunday: Recovery 6 miles

Phase 3: Peak - Race-Specific Training (Weeks 15-17)

Week 15: Peak Long Run Week (66 miles)

Monday: Easy 7 miles
Tuesday: Tempo - 2mi warmup + 7mi at tempo pace + 2mi cooldown = 13 miles
Wednesday: Easy 6 miles
Thursday: Easy 7 miles
Friday: Easy 5 miles
Saturday: PEAK LONG RUN - 22 miles (first 15 easy, last 7 at marathon pace)
Sunday: Recovery 6 miles

Week 16: Final Quality Week (68 miles - PEAK MILEAGE)

Monday: Easy 7 miles
Tuesday: MP Run - 2mi warmup + 10mi at marathon pace + 2mi cooldown = 16 miles
Wednesday: Easy 6 miles
Thursday: Easy 8 miles
Friday: Easy 5 miles
Saturday: Long run 20 miles (first 16 easy, last 4 at MP)
Sunday: Recovery 6 miles

Week 17: Begin Taper (44 miles)

Monday: Easy 6 miles
Tuesday: Sharpener - 2mi warmup + 4mi at tempo + 3min rest + 6x400m at 5K pace w/90sec rest + 2mi cooldown = 10 miles
Wednesday: Easy 5 miles
Thursday: Easy 6 miles
Friday: Rest
Saturday: Long run 12 miles easy
Sunday: Recovery 5 miles

Phase 4: Final Taper & Race (Week 18)

Week 18: Taper Week (16 miles + race)

Monday: Easy 5 miles
Tuesday: Easy 4 miles + 6x100m strides
Wednesday: Easy 4 miles with 4x400m at marathon pace (w/full recovery)
Thursday: Easy 3 miles
Friday: Rest
Saturday: Easy 20 min jog + 4x100m strides OR complete rest
Sunday: RACE DAY! MARATHON 🏁

Workout Descriptions

Easy Runs

Pace: Conversational, full sentences
HR: Zone 2 (60-70% max)
Purpose: Build aerobic base, recovery
Critical: For marathon, easy must be truly easy (often 60-90 sec/mile slower than MP)

Strides

Distance: 100 meters
Pace: Smooth to mile race pace
Purpose: Maintain leg speed, neuromuscular efficiency
Frequency: 2-3x per week

Marathon Pace (MP) Runs

Pace: Goal marathon race pace
HR: Zone 3 (70-80% max)
Purpose: Train body/mind for race effort, practice fueling
Critical: Most important workout for marathon - practice pacing and nutrition

Tempo Runs (Threshold Pace)

Pace: "Comfortably hard" - roughly 10K to HM pace
HR: Zone 4 (80-90% max)
Purpose: Improve lactate threshold, mental toughness
Note: Important but secondary to MP work for marathon

Intervals (VO2 Max Pace)

Pace: 5K race pace
Purpose: Maintain speed, improve VO2 max
Note: Used sparingly in marathon training - maintains speed without excess stress

Long Runs

Types:
- Easy long runs: All easy pace (early weeks)
- MP long runs: Finish with marathon pace miles (build weeks)
- Goal: Build endurance, practice race pace, test fueling
Peak: 22 miles (Week 15)

Recovery Runs

Pace: Very easy, slower than easy runs
Purpose: Active recovery, especially after long runs
Critical: Day after 18+ mile run should be easy recovery

Marathon Racing Strategy

The Final Two Weeks:

Week 17: Cut volume by ~25%, maintain some quality
Week 18: Cut volume by ~50%, short easy runs + strides
Last hard workout: 10 days before race
Last long run: 14 days before race (12 miles)

Race Week Details:

Sunday (8 days out): Last long run (12 miles easy)
Monday-Thursday: Short easy runs, strides
Friday: Rest or 20 min very easy
Saturday: Rest or 15-20 min shakeout with strides
Sunday: RACE

Pre-Race Preparation:

3 days before: Start carb-loading (increase carbs, reduce fiber)
2 days before: Continue carbs, stay hydrated, reduce fiber
1 day before: Light carbs, hydrate, avoid new foods, early dinner
Morning of: Light breakfast 2-3 hours before (tested in training!)

Race Day Warm-Up:

10-15 min easy jog (don't overdo it)
4-6x100m strides
Dynamic stretches
Bathroom
Line up 10-15 min early

Marathon Pacing Strategy:

Conservative Strategy (HIGHLY RECOMMENDED for first marathon):

Miles 1-6: 10-15 sec/mile SLOWER than goal pace (hardest discipline!)
Miles 7-13: Ease into goal pace, assess how you feel
Miles 14-18: Hold goal pace, stay mentally strong
Miles 19-23: This is the race - mental toughness critical
Miles 24-26.2: Give what you have left

The Wall:

Typically hits Miles 18-22
Caused by glycogen depletion
Avoid by: proper training, pacing, fueling
If you hit it: slow down, walk if needed, finish strong

Even Pace Strategy (Experienced Marathoners):

Aim for even splits
Slight negative split if conditions allow
Adjust for hills, wind, heat

Fueling Strategy:

Before Race:

Breakfast 2-3 hours before
Tested meal (never try new foods!)
Example: Bagel with peanut butter + banana + water

During Race:

Water: Every aid station (small sips early, more later)
Sports drink: Alternate with water, or every other station
Gels/Fuel:
- Start at Mile 6-8
- Every 45-60 minutes (roughly every 4-5 miles)
- Practice this in long runs!
- Take with water, not sports drink
Total fuel: 4-6 gels for most runners

Common Fueling Mistakes:

Waiting until Mile 15-18 (too late!)
Not practicing in training
Trying new products on race day
Not taking in enough calories

Post-Race Recovery:

Immediate:

Walk for 10-15 minutes
Stretch gently
Eat/drink within 30 min (carbs + protein)
Keep moving periodically

Week 1:

Complete rest or very easy walking/swimming
No running for 3-5 days minimum
Focus on sleep, nutrition, hydration

Week 2:

Easy running only, 20-30 min
No more than every other day
Listen to your body

Weeks 3-4:

Gradual return to easy running
No hard workouts for 3-4 weeks minimum
Rule: 1 day recovery for every mile raced (26 days easy!)

Long Run Progression

Week 1:  13 miles (easy)
Week 2:  14 miles (easy)
Week 3:  16 miles (easy)
Week 4:  12 miles (recovery)
Week 5:  17 miles (easy)
Week 6:  18 miles (easy)
Week 7:  19 miles (easy)
Week 8:  14 miles (recovery)
Week 9:  18 miles (5mi MP finish)
Week 10: 19 miles (easy)
Week 11: 20 miles (6mi MP finish)
Week 12: 15 miles (recovery)
Week 13: 20 miles (6mi MP middle)
Week 14: 16 miles or Half Marathon race
Week 15: 22 miles (7mi MP finish) ← PEAK
Week 16: 20 miles (4mi MP finish)
Week 17: 12 miles (taper)
Week 18: MARATHON (26.2 miles!)

Weekly Mileage Progression

Week 1: 41-45 miles
Week 2: 48 miles
Week 3: 52 miles
Week 4: 35 miles (recovery)
Week 5: 54 miles
Week 6: 56 miles
Week 7: 59 miles
Week 8: 39 miles (recovery)
Week 9: 55 miles
Week 10: 60 miles
Week 11: 63 miles
Week 12: 41 miles (recovery)
Week 13: 62 miles
Week 14: 42 miles + race
Week 15: 66 miles
Week 16: 68 miles (PEAK)
Week 17: 44 miles (taper begins)
Week 18: 16 miles + race (taper)

Customization Guidelines

If This Is Your First Marathon:

Consider adding 2-4 weeks to base phase
Be conservative with MP segments in long runs
Focus on finishing, not time goal
Start 10-15 sec/mile slower than predicted pace

If You're More Experienced:

Can peak at 60-65 miles if your base supports it
Can extend peak long run to 23 miles
More aggressive MP practice
Can add a midweek medium-long run (10-12 miles)

If You Miss a Workout:

Easy run: Skip it
Long run: Absolutely reschedule if possible - MOST IMPORTANT
MP workout: Important - try to reschedule
Tempo/Intervals: Can skip if needed
Never: Stack long run and quality in same 48 hours

Training Intensity Distribution

Marathon plan follows 80/20:

~80% easy running (Zones 1-2)
~10-12% marathon pace (Zone 3)
~5-8% tempo (Zone 4)
~2-3% intervals (Zone 5)

The marathon is primarily an aerobic race - easy miles are crucial!

Success Tips

Respect the long run - Never skip, always prioritize
Easy runs truly easy - Most important for marathon training
Practice marathon pace - Must be comfortable with race pace
Nail your fueling - Test everything in training
Never go out too fast - Discipline in first 10K pays off
Respect the taper - Trust your training, rest is productive
Stay healthy - Consistent 95% plan beats injured 100% plan
Sleep 8-9 hours - Recovery needs increase with marathon training

Mental Preparation

The marathon is 50% mental:

Visualization: Picture yourself executing race plan
Break it down: Think in 10K or 5-mile segments
Positive self-talk: Prepare mantras for tough miles
Expect discomfort: Miles 18-23 will hurt - plan for it
Trust your training: You've put in the work

Common Marathon Training Mistakes

Running easy days too fast → Chronic fatigue, poor long runs
Going out too fast on race day → The wall at Mile 20
Skipping MP practice → Race pace feels foreign
Inadequate fueling practice → GI issues or bonking
Not respecting recovery → Injury, overtraining
Doing too much in taper → Arriving fatigued
Trying new things on race day → Blisters, GI distress

Expected Adaptations

By the end of this plan:

Massive aerobic development
Improved fat oxidation (critical for marathon)
Mental toughness for long efforts
Efficient running economy
Race-specific fitness for 26.2 miles
Confidence in your preparation

Additional Resources

Marathon Pacing: See Lactate Threshold
Long Run Science: See The Aerobic System
Recovery: See Recovery and Adaptation
Periodization: See Training Periodization Visual Guide
Training Systems: See Comparing Training Systems

Good luck with your marathon training! The marathon is a humbling and rewarding distance. Respect the training, trust the process, execute your plan, and you'll cross that finish line with pride. Remember: the hay is in the barn by race day. Trust your training! 🏃‍♂️💪🎉