The Short Answer
The timeline depends on where you're starting from and what distance you're targeting. Read our backyard ultra training guide for a detailed 16-week framework.
Training Timelines by Distance
| Distance | Prerequisite | Training Block | Peak Weekly Volume |
|---|---|---|---|
| 50K | Marathon finish | 12–16 weeks | 50–65 km/week |
| 100K | 50K finish | 16–20 weeks | 65–85 km/week |
| 100 miles | 100K + experience | 20–30 weeks | 80–110 km/week |
| 24-hour race | Ultra experience | 16–24 weeks | 65–85 km/week |
| Backyard ultra | Ultra experience | 16–24 weeks | 65–85 km/week |
The Core Principle
Train for time on feet, not pace. A 4-hour run at easy pace teaches your body more about ultrarunning than a fast 2-hour run. The single best predictor of ultra success is total weekly time on feet, not weekly mileage.
Sources
- Koop, J. (2016) — Training Essentials for Ultrarunning. VeloPress.
- Millet, G.P. et al. (2011) — "Physiological and biomechanical factors." Sports Medicine, 41(6), 477–497.