Trail 20K Training Plan: 14 Weeks, Beginner, Pace
A structured, progressive 14-week pace-based plan to get you to the finish line of your first trail 20K healthy and confident. It builds your aerobic base, climbing and descending strength and race-day routines step by step, with an easier week every fourth week.
The Race
A typical trail 20K: 20 km (12.4 mi) with about 400-900 m (1,300-3,000 ft) of climbing. Longer climbs, more technical sections and 2-3 hours on your feet for most first-timers. The plan works for any trail race of this distance: the race day is set as an event on the final Saturday.
Who It Is For
You have finished a 10K (trail or road), run 3 times a week and can run 45 min continuously.
Your 14 Weeks
- Phases: Preparation weeks 1-2, Base weeks 3-6, Build weeks 7-10, Specific weeks 11-12, Taper week 13, race week 14.
- Weekly: 3 runs and 2 strength sessions, about 2.7 h rising to 4.3 h of running.
- Long runs: 45 min to 1h50.
- Climbing: about 150 m rising to 550 m a week.
- Trail skills: hill repeats, power hiking, downhill technique, fueling practice and a dress rehearsal.
- Strength: two RunForce 45-min sessions built in the TrainingPeaks Strength Builder (A: Force & Posterior Chain; B: Single-Leg & Mountain Durability), with a demonstration video for every exercise.
Pace Training
- Easy: 75-84% of threshold pace (most of your running)
- Steady: 84-90%
- Tempo: 88-94%
- Threshold: 95-100%
- Intervals: 102-108%
Every run is prescribed as % of your threshold pace, with a 30-min test in week 1 and retests later. Pace targets are used on flat and rolling ground; on climbs and technical trail the workouts tell you to run by effort.
The RunForce Beginner Trail Series
Seven progressive plans: 10K, 20K, 30K / 20 Miles, 50K, 75K / 50 Miles, 100K and 100 Miles, each in Heart Rate, RPE and Pace versions. Finish one, recover for 2-4 weeks, then start the next distance. This plan is also available in Heart Rate and RPE versions. Search "RunForce Beginner Trail" in the TrainingPeaks store.
Your Coach: Adrien Thévenet
Endurance coach since 2011, working with elite athletes, professional endurance athletes, major race winners, and a Spartan National Champion across road, trail, and mountain running.
Certifications:
-25 Years of Endurance Sports Experience
-TrainingPeaks Level 2
-UESCA Ultrarunning
-RRCA Certified
-STRYD Power Coach
-ACE Certified
With 25 years in endurance sports, I offer tailored coaching for diverse runners - from beginners to sub 3-hour marathoners. Emphasizing well-being, we collaborate on a program that fits your life keeping you motivated.