Marathon Peak Mileage Week: When to Hit Your Highest Weekly Mileage and How Much Is Optimal

Marathon Training Peak Mileage Week: When to Reach Peak Weekly Mileage and How High Is Optimal

Introduction

In marathon training, the “Peak Week” refers to the week with the highest weekly mileage in the entire training cycle. The timing and mileage of this peak have a profound impact on race performance: if the peak is too low, the aerobic base is insufficient; if it is too high, you won’t fully recover by race day; if the peak is too close to race day, the taper effect will be inadequate.

This article will analyze, from a training physiology perspective, how to set the most suitable peak week for runners of different levels.

The Physiological Significance of Peak Week

Peak week is not “the hardest week,” but rather “the fullest expression of your aerobic base.” During peak week, a runner’s cumulative training effect reaches its high point, including:

Highest capillary density
Greatest myoglobin content in muscles
Optimal fat metabolism efficiency
Strongest lactate tolerance

After peak week, a taper (reduction period) allows the body to fully recover, so that all accumulated training can be unleashed on race day.

Timing of Peak Week Relative to Race Day

Research shows that the optimal peak week for marathon runners should be completed 3–4 weeks before race day. Specifically:

Target Time	Recommended Peak Week Timing	Reason
Over 5 hours	3 weeks before race	Relatively low weekly volume, faster recovery, 3 weeks is sufficient
4–5 hours	3–3.5 weeks before race	Standard approach
3:30–4:00	3.5–4 weeks before race	Higher weekly volume requires longer recovery
Sub-3:30	4 weeks before race	High-intensity training requires more complete supercompensation

Peak Week Mileage Recommendations by Runner Level

Target Time	Recommended Peak Weekly Mileage	Maximum Long Run Distance	Notes
Over 5 hours (first marathon)	45–55 km	28–30 km	Conservative strategy to avoid injury
4:30–5:00	55–65 km	30–32 km	Standard beginner marathon plan
4:00–4:30	65–75 km	32–34 km	Requires a stable training base
3:30–4:00	75–90 km	34–36 km	Advanced plan
Sub-3:30	90–110 km	35–38 km	High-level competitive plan

Peak Week Design Principles

Don’t Make Peak Week a “Quality Session Peak Week”

The high mileage in peak week should mainly come from increasing easy run volume, rather than scheduling the hardest intervals during peak week. The intensity of quality sessions during peak week should remain at normal levels, or even be slightly reduced, so the body retains sufficient recovery capacity under high mileage.

The Long Run in Peak Week Doesn’t Have to Be the Longest

Many plans schedule the longest 32–34 km long run during peak week, but it can also be done one week earlier, keeping the peak week long run at 28–30 km to reduce recovery stress.

Build Progressively Toward the Peak, Not with Jump Increases

The ideal peak week is a “natural high point,” built up gradually over the preceding weeks (increasing no more than 10% per week), rather than suddenly jumping 20–30% in a single week.

Practical Considerations for Taiwanese Runners

Climate Factors: Due to high heat and humidity, actual mileage during Taiwan’s summer training (May–September) should be 10–15% less than planned. If your plan calls for a 75 km peak week, completing 65 km in summer is also reasonable.

Work Schedules: Many Taiwanese runners work on weekdays, and the high mileage of peak week often requires sacrificing sleep. It is recommended to schedule high-volume weeks during periods of lighter work stress; the 4 weeks before race day can usually be arranged in advance.

Race Selection: If you choose a Taiwanese winter marathon (November–February), peak week typically falls in the early autumn cool period of August–October, when training quality improves significantly as temperatures drop.

Practical Recommendations

Recovery week before peak week: Set the week before peak week as a recovery week (reduce volume by 20%), allowing the body to enter the highest training week in a well-rested state.
Start tapering immediately after peak week: Do not continue high-volume training after peak week; begin reducing volume immediately so that supercompensation can fully occur.
Record your body’s responses during peak week: Fatigue levels, sleep quality, and resting heart rate—these data help assess whether your body is handling the load well and provide a reference for the next training cycle.

Conclusion

Peak week is not the end of training, but the starting point of supercompensation. Setting a reasonable peak mileage and choosing the right timing allow your body to race at its best on race day—this is the essence of scientific training. When arranging peak week, Taiwanese runners should also fully consider local climate conditions and lifestyle rhythms to ensure the training plan is truly executable.