Chiang Mai Thailand - CHEDI 20 2025
The forecast arrives five days before the start.
Here you'll find the elevation profile and an estimated finish time based on your UTMB Index.
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.
Cut-off times and crew - Chiang Mai Thailand - CHEDI 20 · 2025
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| A17 Huay Tueng Thao Reservoir | 9.2 | 0 m | 9.2 | 576 m | 540 m | — | — | — |
| Chiang Mai PAO Park | 16.6 | 0 m | 7.5 | 155 m | 188 m | — | Sun 12:30 PM | — |
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 not documented.
Elevation profile
The course and its aid stations
Chiang Mai Thailand - CHEDI 20: 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 2h07 to 1h25, and the aid-station stop budget from 0h02 to 0h01. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 2h07 | 0h02 | — | 127 g | 1.5 L | 1,057 mg | +2h53 |
| 550 | 1h57 | 0h02 | — | 117 g | 1.4 L | 972 mg | +3h03 |
| 600 | 1h49 | 0h01 | — | 109 g | 1.3 L | 905 mg | +3h11 |
| 650 | 1h42 | 0h01 | — | 102 g | 1.2 L | 847 mg | +3h18 |
| 700 | 1h35 | 0h01 | — | 95 g | 1.1 L | 792 mg | +3h25 |
| 750 | 1h30 | 0h01 | — | 90 g | 1 L | 747 mg | +3h30 |
| 800 | 1h25 | 0h01 | — | 85 g | 1 L | 705 mg | +3h35 |
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.
Measured on the 2025 edition: the field checkpoint by checkpoint
957 starters, 1.7% DNF rate, 2 timed checkpoints.
| Segment | km | Median | Middle half | Measured | Median passage | Still ranked |
|---|---|---|---|---|---|---|
| Chiang Mai PAO Park → A17 Huay Tueng Thao Reservoir | 9.2 | 2 h 07 | 1 h 45 – 2 h 28 | 952 | 2 h 06 | 953 |
| A17 Huay Tueng Thao Reservoir → Chiang Mai PAO Park | 16.6 | 1 h 18 | 1 h 03 – 1 h 33 | 940 | 3 h 24 | 941 |
“Median passage” is elapsed time from the start, not a clock time: the clock time depends on the edition.
Where runners drop out. A17 Huay Tueng Thao Reservoir (12) · Chiang Mai PAO Park (4) out of 16 total DNFs.
RAVIT record from the official timing of the 2025 edition, data from September 17, 2026.
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Chiang Mai Thailand - CHEDI 20 over the years
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 — Chiang Mai Thailand - CHEDI 20
Weather for Chiang Mai Thailand - CHEDI 20
The weather for Chiang Mai Thailand - CHEDI 20 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 Chiang Mai Thailand - CHEDI 20, hour by hour on the courseFrequently asked questions
How many checkpoints?
Chiang Mai Thailand - CHEDI 20 has 2 checkpoints: 2 checkpoints with undocumented contents. Details are in the two tables above.
What distance and elevation gain?
Chiang Mai Thailand - CHEDI 20 is 17 km long with 731 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 1h49 for Chiang Mai Thailand - CHEDI 20.
What's the weather forecast?
The weather for Chiang Mai Thailand - CHEDI 20 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 Chiang Mai Thailand - CHEDI 20?
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