Tapering in Trail Running: How to Cut Back and Arrive Fresh on Race Day (5/5)
It’s the most delicate and sometimes the most frustrating period: the time when you do less to run faster. The tapering phase marks the end of training and the start of performance. After weeks of piling on hours and elevation gain, it’s time to let your body absorb everything it has learned — to reduce fatigue without losing rhythm.
Understanding the role of tapering
Tapering isn’t rest, it’s transformation. Training volume is reduced so the body can recover, regenerate, and supercompensate. Studies show a proper taper can improve performance by an average of 3% — a huge gain in a race lasting several hours.
The ideal duration is 15 to 21 days, sometimes less for shorter races (10 days may be enough for a 20–30 km, three weeks for an ultra). Too short and your body won’t absorb the work; too long and it becomes sluggish.
How to cut back without losing fitness
The principle is simple: reduce volume, not intensity. Keep the structure of previous weeks — two quality sessions, easy runs, light strength work — but shorten everything.
- −20% of total volume in the first week
- −40% in the second
- −60% in the final week
Easy runs get shorter, threshold workouts go from 3 × 15 min to 3 × 8 min, long runs drop from 4 hours to 2. But intensity stays: you keep running fast to stay sharp and responsive. That combination — maintained intensity, reduced volume — is what triggers supercompensation. You may feel heavy at first, then suddenly everything clicks.
What the last weeks look like
For a 40 km trail, the classic taper spans three weeks:
- Week −3: 80% of usual volume. Wrap up your final big block with shorter but more intense sessions. A 3-hour long run is enough.
- Week −2: 60%. Keep one interval session, one hill workout, and a 2-hour long run. Recovery days become as important as training days.
- Week −1: 40%. Easy jogs, smooth runs, mental prep. Light and dynamic, never exhausting.
For an ultra the same logic applies over a longer taper: a full three-week cycle starting with a solid week (4–5 h long run), then gradually cutting volume down to 50% of your peak.
The sessions to keep
- Intervals or hill reps to maintain power, with fewer repetitions
- Easy endurance runs, about 70% of weekly volume
- A shortened long run, 1.5 to 2 hours depending on your race
- Some cross-training or walking to promote recovery
And above all: sleep, deep breathing, calm. Don’t aim to improve during this phase — aim to let your training turn into performance.
Adapting to your profile
If your schedule is tight, tapering is your best friend: shorter sessions free up time to rest, eat well and sleep. Just 20 minutes of effort is enough to keep your body sharp. Experienced athletes can keep slightly more volume (60–70% of the peak week) to avoid feeling flat. If you’re preparing an ultra, ease off slowly — recovery from large loads takes longer.
As mental as it is physical
As mileage drops, doubts rise. Some feel too good and want to test their legs; others panic at doing less. Resist. This is when you build confidence: prepare your gear, visualise the course, review your fueling strategy, rehearse your starting pace.
You should finish your taper with a burning desire to run. Being a bit bored is a good sign: your body is recharging. Tapering is the final climb before the summit — you move slower, but you gain power.
This article is part of the series “Build your trail season”: 1/5 Planning your season · 2/5 The base phase · 3/5 General development · 4/5 Specific development · 5/5 Tapering