RunForestRun Indian Summer Ultra (10th edition) takes place on Sat, Oct 10, 2026 in Gasselte, Netherlands. The main route is 100 km.
- Date
- Sat, Oct 10, 2026
- Start
- Gasselte 🇳🇱
- Distance
- 100 km
- Level
- Open to all
The 10th-edition Indian Summer Ultra, RunForestRun's long-distance trail from Gasselte through Drenthe's autumn forests. 100 / 75 / 50 km.
What this race demands
This 100-kilometer trail ultramarathon through autumn forests demands sustained cardiovascular endurance and prolonged time-on-feet.
Aerobic Endurance
Covering 100 kilometers on foot requires an exceptionally high volume of steady-state aerobic output and cardiovascular conditioning.
Musculoskeletal Durability
The ultra-distance format subjects joints and connective tissue to continuous impact over many hours of continuous running and walking.
Given the extended duration well beyond 2.5 hours, athletes must ingest 60 to 90 grams of carbohydrates per hour to sustain energy levels.
Your road to race day
Race day at RunForestRun Indian Summer Ultra (10th edition) is 5 weeks away. This is how a coach divides that time. The first phase starts now.
01Peak2 weeks · Sep 6, 2026 – Sep 19, 2026
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
02Taper2 weeks · Sep 20, 2026 – Oct 3, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
03Race week1 week · Oct 4, 2026 – Oct 10, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
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