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Trail Running · Chiang Mai

🇹🇭Thailand by UTMB 100 km:
Course Analysis & Race Readiness

A 100 km ultra with 5,080 m of gain and 5,123 m of loss across 13 climbs and 12 descents. Descending dominates at 44% of the course, with sustained steep drops demanding controlled, resilient legs throughout.

CourseRecon scores your own training against the descending and durability demands that define Thailand by UTMB 100 km — the sample analysis below shows exactly how.

99.6 km
Distance
+4,940 m
Vertical Gain
−4,990 m
Total Descent
Dec 4, 2026
Next Edition · 142 days out
Check YOUR readiness
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The Course · GPS-Measured

What 99.6 km / 61.9 mi and 4,940 m / 16,220 ft of vertical gain actually look like

Measured from the GPS track: 99.6 km / 61.9 mi and 4,940 m / 16,220 ft of vertical gain. This is the terrain you're signing up for: read it before it reads you.

Course Profile

Terrain summary
Claimed vs GPS-Measured
Claimed · Organizer
99.6km
Distance
+5,080m
Gain
+0.0 km−140 m
GPS-Measured
99.6km
Distance
+4,940m
Gain
Climb & Gradient
+4,940 mTotal Gain
−4,990 mTotal Loss
Gradient Distribution
23%
Flat
≤3% grade
35%
Run-Climb
3–15% up
1%
Steep Climb
>15% up
41%
Descent
downhill
Steepest Sustained Sections
1
Descent
KM 45.4–49.3 · −547 m
-13.9%
2
Climb
KM 19.5–21.7 · +302 m
+13.3%
3
Climb
KM 38.1–41.7 · +462 m
+12.8%
4
Climb
KM 56.6–62.0 · +625 m
+11.5%
Finish & Cutoff Times

What it takes to finish

Reference finish times from past results — use them to set a realistic goal pace.

10h 05m
Winning time
10h 48m
Top 5
11h 19m
Top 10
28h 00m
Back of pack
What This Race Demands

Four things this course asks of your body

Every course weights the four pillars of mountain-ultra fitness differently. Descending carries 45% of the scoring weight on this course — the terrain makes that the deciding factor.

Weighting shows where readiness is won or lost at this distance — not whether you need each pillar. An aerobic base is a given for a race this long, so it carries little deciding weight even though it's essential — the gaps open on the climbs, descents and the back half.

AerobicSustained engine
Foundational
Sustained 100 km effort with 5,080 m of accumulated climbing over 13 separate ascents.
ClimbingVertical power
19%
Thirteen climbs including a 625 m ascent over 8 km and multiple pitches above 12%.
DescendingEccentric / braking
45%
Nearly half the course points downhill, including a 889 m loss and a 547 m plunge at -13.9%.
DurabilityLate-race resilience
35%
Repeated pounding across 5,123 m of descent and 5,080 m of gain over 100 km.
The Profile in One Line

Descent-heavy 100 km ultra: 5,080 m up, 5,123 m down, topping out at 1,555 m from a 367 m start.

Aerobic FoundationalClimbing 19%Descending 45%Durability 35%

Here's how CourseRecon reads a course and an athlete

Sample Readiness Analysis

What a readiness result looks like for this course

This is a worked example for a representative strong mountain-ultra athlete — not your score. Connect your own training and the same analysis runs on you.

Sample
81
OUT OF 100
READY
For a representative strong mountain-ultra athlete

This is a sample — connect your Strava to see your own result.

Pillar Breakdown
Aerobic
68
Covering 100 km with 5,080 m of gain requires a deep aerobic base to hold effort across 13 climbs from a 367 m start to a 1,555 m high point.
Climbing
98
Thirteen ascents totaling 5,080 m, headlined by a 625 m climb over 8 km and steep pitches reaching 13.3%, demand strong sustained uphill power.
Descending
84
Descent covers 44% of the course, including a 889 m biggest loss, a 10.6 km longest descent, and a 547 m drop averaging -13.9%, taxing braking control.
Durability
69
With 5,123 m of loss and 5,080 m of gain over 100 km, quads and joints must survive relentless eccentric loading late in the race.
KM 56.6–62.0
The Biggest Climb
A 625 m ascent over 5.4 km at 11.5% arrives past halfway, forcing sustained uphill work on already-fatigued legs.
KM 45.4–49.3
Steepest Descent
A 547 m drop over 3.9 km at -13.9% punishes quads and braking control, the sharpest descent grade on course.
Descent load
5,123 m Down
Descending makes up 44% of the course, with the longest descent running 10.6 km and the biggest losing 889 m, demanding durable legs to the finish.
That was a sample

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