Anta Guanjun Hong Kong 100 Ultra Trail Race (HK100)
Hong Kong 100 Ultra Trail Race
Pak Tam Chung, Sai Kung → Rotary Club Park, Tai Mo Shan (near Tsuen Wan)
Race guide
Updated 19 July 2026
The Hong Kong 100 Ultra Trail Race (officially the Anta Guanjun Hong Kong 100 Ultra Trail Race, or HK100) is one of Asia's most prestigious ultra-trail events, covering 93 km from Pak Tam Chung in Sai Kung to the Rotary Club Park near Tai Mo Shan in Tsuen Wan. Despite its name, the measured distance is 93 km — every metre counts given the 4,629 m of total elevation gain packed into a course that rarely lets you relax. With a high point of 917 m and a finish cut-off of 13:00 on Day 1, the HK100 is a fast, technical race that rewards runners who can move efficiently across both rugged coastal trails and steep urban-fringe ridgelines. The course travels west from the wild Sai Kung peninsula, threading through multiple country parks before climbing into the Kowloon highlands and finishing on the flanks of Tai Mo Shan, Hong Kong's highest peak. Eight checkpoints spread across the route offer crew access at CP3 (41 km) and CP4 (49 km), making strategic support planning essential. The diversity of terrain — sea-level beach approaches, exposed granite ridges, forested singletrack, and urban-edge staircases — means no two sections feel the same, and fitness alone will not carry you through without solid technical trail skills.
Course & Terrain
The race begins at sea level (13 m) in Pak Tam Chung, immediately launching into the rugged Sai Kung East Country Park trail network. The first 19 km to CP1 near Ham Tin and the East Dam area are deceptively demanding: coastal singletrack and rocky shoreline paths keep the footing honest and sap energy early. From CP1 the route climbs inland through Hau Tong Kai (CP2, 32 km, 150 m) and continues to the Yung Shue O area (CP3, 41 km) — the first crew-accessible point — before dropping again toward Kei Ling Ha (CP4, 49 km, 111 m), the second crew point at roughly the halfway mark. The second half of the course shifts character significantly. From Kei Ling Ha the trail climbs more consistently, passing Gilwell/Keevil Camp (CP5, 62 km, 396 m) before traversing Beacon Hill (CP6, 70 km, 305 m) and pushing through Shing Mun/City Gate (CP7, 80 km, 372 m). The final stretch from Lead Mine Pass (CP8, 84 km, 405 m) to the Rotary Club Park finish (93 km, 474 m) involves the approach to Tai Mo Shan's upper reaches, where the exposed ridge and altitude up to 917 m create conditions unlike anything earlier on the course. The overall elevation profile is relentlessly rolling rather than featuring one single brutal climb — cumulative fatigue is the defining challenge.
Decisive Climbs & Where the Race Is Won or Lost
The back-to-back climbs in the final 30 km are where the HK100 is decided. The sustained ascent from Kei Ling Ha (111 m) up to the Gilwell/Keevil plateau (396 m) over roughly 13 km marks the point where runners who went out too hard begin to unravel. Beacon Hill (305 m at CP6, 70 km) offers a brief psychological lift, but the descent into the Shing Mun/City Gate section is steep and technical and should not be bombed recklessly with 23 km still to go. The final push from Lead Mine Pass (CP8, 84 km, 405 m) to the finish at 474 m, culminating in the approach toward Tai Mo Shan's high point of 917 m, is the race's true sting in the tail. Wind, reduced visibility, and cold temperatures can appear here regardless of conditions lower down. Runners who have managed effort well up to CP8 and still have leg strength for technical climbing will gain significant time on the field in these last 9 km. Losing your footing or momentum on the exposed upper trails with the cut-off clock ticking is how many runners' days end.
Pacing & Fuelling Strategy
With a finish cut-off of 13:00 on Day 1 and 93 km to cover, most competitive runners target an average moving pace that leaves a small buffer at each checkpoint. The flat-to-rolling Sai Kung opening is tempting to run fast, but the elevation is deceptive — arrive at CP1 (19 km) feeling controlled, not emptied. Use the crew access windows at CP3 (41 km) and CP4 (49 km) to replenish calories, change wet socks, and reassess kit for the more exposed second half. These are the only two crew points on the course, so brief and efficient stops here are disproportionately valuable. Calorie intake should begin within the first 30–40 minutes and continue every 30–45 minutes throughout. The density of aid stations (eight checkpoints across 93 km) means carrying large food reserves is unnecessary, but you should never arrive at a checkpoint running on empty. Given the race is held in January, temperature can range from cool and clear to cold, wet, and windy — particularly above 400 m. Factor in that calorie burn increases in cold and wet conditions, and plan liquid intake carefully: humidity can remain high even in winter, making sweat-rate prediction tricky. Salt and electrolyte management is important from the Sai Kung coastal section onward.
Conditions to Expect
The HK100 is held in January, which places it in Hong Kong's cool, drier season — but 'dry' is relative. Temperatures at sea level in Sai Kung typically range from around 10–18 °C at race start, while the upper reaches of Tai Mo Shan near the 917 m high point can be significantly colder, with wind chill a real factor on exposed ridgelines. Fog and low cloud frequently settle on Tai Mo Shan, reducing visibility at the finish approach and making navigation on the upper trail critical. The coastal trails in the Sai Kung section can be muddy and slippery after recent rainfall, and the granite slabs that characterise parts of the route become treacherous when wet. Most of the key technical descents — particularly around Beacon Hill, Shing Mun, and the Lead Mine Pass approach — require confident footwork regardless of conditions. A lightweight wind and waterproof shell, gloves, and a warm mid-layer for the later stages are strongly recommended even on clear-forecast days. Mandatory kit requirements exist for good reason on this course.
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Checkpoints & cut-offs
✓ Course data verified against the official source (2026-07-05) · official source
0 km · 13 m · —
10 km · 96 m · Sat 09:15
19 km · 3 m · Sat 11:30
32 km · 150 m · Sat 15:00
41 km · 39 m · Sat 17:30
49 km · 111 m · Sat 20:15
62 km · 396 m · Sun 01:15
70 km · 305 m · Sun 04:00
77 km · 201 m · Sun 06:15
84 km · 405 m · Sun 09:15
93 km · 474 m · Sun 12:00
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