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Cover photo of Kasterlee - Halve Natuurmarathon 2026 — 21 km, 100 m elevation gain

Kasterlee - Halve Natuurmarathon 2026

November 15, 2026
Distance
21.0 km
Elevation gain
100 m
Country
🇧🇪 Belgium
Download the GPXOfficial race website
Course weather at your time of passage

The forecast arrives five days before the start.

Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 4 aid stations to plan your nutrition and hydration segment by segment.

What's your time based on your UTMB?

Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.

Predicted race time based on your UTMB Index® · field profile (Riegel k=0.70)

UTMB Index®
Normal day
3005007009001000UTMB Index®
SourceUTMB® Index

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Cut-off times and crew - Kasterlee - Halve Natuurmarathon · 2026

21 km race checkpoints: kilometers, elevation, crew, cut-off time and access
Aid stationCum. kmCum. D+Seg. kmSeg. D+Seg. D-CrewCut-offAccess
Ravitaillement 15.012 m5.012 m25 m——
Ravitaillement 210.012 m5.0————
Ravitaillement 315.027 m5.015 m11 m——
Ravitaillement 420.0100 m5.073 m64 m——
Arrivée21.0100 m1.0————
Updated on 10/22/2026 by RAVIT

Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.

What you'll find at each aid station

Aid station contents: products in rows, aid stations in columns
Product1km 5.02km 10.03km 15.04km 20.0
Wateravailableavailableavailableavailable
Brand products · NamedSportavailableavailableavailableavailable
Updated on 10/22/2026 by RAVIT

La feuille de ton assistance pour Kasterlee - Halve Natuurmarathon · 2026

Les règles d'assistance de cette course ne sont pas encore connues : tu marqueras tes rendez-vous toi-même.

Recto, verso et planche d'étiquettes, en PDF : l'exemple d'une coureuse de l'UTMB.

Elevation profile

S01 · Ravitaillement 1 KM 5.0 — Alt 8 m D+ cumulé 12 m5.0 KMRavitaillement 1S02 · Ravitaillement 2 KM 10.0 — Alt 8 m D+ cumulé 12 m10.0 KMRavitaillement 2S03 · Ravitaillement 3 KM 15.0 — Alt 12 m D+ cumulé 27 m15.0 KMRavitaillement 3S04 · Ravitaillement 4 KM 20.0 — Alt 15 m D+ cumulé 100 m20.0 KMRavitaillement 4Start0 KMFinish21.0 KM

The course and its aid stations

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GPX
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Kasterlee - Halve Natuurmarathon: times, aid-station stops and fuelling needs by UTMB® Index

Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 2h00 to 1h20, and the aid-station stop budget from 0h03 to 0h01. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.

SourceUTMB® Index
0h000h020h030h050h063005007009001000UTMB® Index
Estimated time, stop time and fuelling needs on Kasterlee - Halve Natuurmarathon by UTMB Index
UTMB® IndexEstimated timeOf which stopsNight hoursCarbsFluidSodium
5002h000h03—120 g1.4 L1,003 mg
5501h510h02—111 g1.3 L923 mg
6001h430h02—103 g1.2 L862 mg
6501h370h02—97 g1.1 L810 mg
7001h310h01—91 g1.1 L760 mg
7501h260h01—86 g1 L714 mg
8001h200h01—80 g0.9 L665 mg

Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.

Other trails worth preparing for

Sources and method

  • Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
  • Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
  • Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — Kasterlee - Halve Natuurmarathon

Weather for Kasterlee - Halve Natuurmarathon

The weather for Kasterlee - Halve Natuurmarathon will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.

Detailed weather for Kasterlee - Halve Natuurmarathon, hour by hour on the course

Frequently asked questions

How many checkpoints?

Kasterlee - Halve Natuurmarathon has 5 checkpoints: 4 aid stations and 1 checkpoint with undocumented contents. Details are in the two tables above.

What's the longest segment without aid?

The one leading to Ravitaillement 1: 5.0 km and 12 m elevation gain. That's the one to load up for first.

How do I find the exact location of an aid station?

The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.

What distance and elevation gain?

Kasterlee - Halve Natuurmarathon is 21 km long with 100 m of elevation gain.

How long to finish?

With a UTMB Index of 600 (average runner), the estimated time is around 1h43 for Kasterlee - Halve Natuurmarathon.

What's the weather forecast?

The weather for Kasterlee - Halve Natuurmarathon will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.

Want to stack the odds in your favor for Kasterlee - Halve Natuurmarathon?

In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.

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