
The 21.4 km is the longest distance at the New Forest Hinton Admiral Trail Run, an early-March trail race at Hinton Admiral in the New Forest near Christchurch. The loop is flat, yet it leaves the low ground around start and finish for higher terrain twice, and the second ascent only arrives after thirteen kilometres.
The first two kilometres stay flat at start level, then the trail climbs onto ground some 15 to 20 metres higher. Up there the course rolls gently until around kilometre 10 before dropping back to the low level. After roughly three flat kilometres the one sustained rise of the day begins at kilometre 13.4: 400 metres at a little over three percent. It lifts you onto the highest part of the loop, where you stay until shortly before kilometre 19, then the course returns to a flat finish.
The total comes to just under 100 metres of climbing, split into two raised blocks with a flat valley between them. That is little for a half-marathon-length trail race, which is exactly why rhythm rather than gradient decides it here.
The route runs through the New Forest and is fully signed. There are refreshments and water stations on course, first aid cover and timing, and canicross runners with their dogs are welcome. For the long distance that means trail footing and no navigation to worry about, but your own energy still needs managing.
| Start | Length | Ø | Max. | Gain | Cat. |
|---|---|---|---|---|---|
| km 13.4 | 0.4 km | 3.1 % | 5.1 % | +12 m | — |
Climb categories follow the road-cycling convention and rate the terrain itself (length and gradient) regardless of sport: Cat. 4 marks the easiest rated climbs, Cat. 1 the hardest, and HC (hors catégorie, “beyond categorization”) is reserved for the most brutal ascents. Short climbs below the Cat. 4 threshold stay unrated.
Split the race into three pieces: the first raised section to kilometre 10, the flat stretch in between, and everything from the rise at kilometre 13.4 onwards. In the first block, run deliberately below your half-marathon feel, because its small undulations add up without any one of them registering.
The race is decided in the second raised block. The climb itself is a gentle three percent, but it reaches you after more than an hour of running, and a good five kilometres on the highest ground still follow it. Whoever can keep applying steady pressure there gains places on the flat run-in.
The trap is the flat valley between the blocks. It invites a surge, since the footing feels easy and everything flows after the descent. Speed up there and you pay twice on the rise at kilometre 13.4. Use the valley to eat, drink and let your heart rate settle instead.

Most age-group runners will need roughly 1:45 to 2:45 hours for this distance. The effort is predominantly steady and aerobic, with small undulations rather than hard spikes, which puts it closer to a road half marathon than to a hill race, only on softer ground.
Endurance is the core: long runs of 18 to 24 kilometres on unsurfaced paths prepare you for the duration. In some of them, add a race-pace segment in the final third, ideally with a long, shallow incline inside it. That rehearses exactly what the second raised block asks for: controlled pace on legs that are already tired.
Trail footing costs more strength in the feet and hips than tarmac, so ankle and core stability work belongs in your week twice. One or two tempo runs of 30 to 40 minutes off-road teach you to hold steady pressure without kilometre markers to lean on.
The race is in early March, so your longest sessions fall in January and February. Run them off-road and in the kit you plan to race in, and practise eating and drinking on the move so you can actually refuel in the flat middle section.

Download the New Forest Hinton Admiral Trail Run course as a GPX file for your watch or bike computer.
Ben connects your goal, the course, current load, recovery, and calendar. Your plan stays pointed at race day even when real life is not perfectly plannable.
New Forest Hinton Admiral Trail Run is 21.4 km long. That distance shapes how much aerobic endurance, pace durability, and race-specific work belong in the training plan.
New Forest Hinton Admiral Trail Run has around 99 m of elevation gain over 21.4 km. That affects pacing, muscular load, and preparation for late-race sections.
New Forest Hinton Admiral Trail Run is classified as Flat, averaging 4.6 vertical metres per kilometre. 67% of the route is flat, 16% climbs moderately (2 to 6%) and 0% is steeper than 6%.
The hardest climb of New Forest Hinton Admiral Trail Run starts at kilometre 13.4, runs for 0.4 km at an average of 3.1% and gains 12 metres.
Yes, New Forest Hinton Admiral Trail Run is laid out as a loop: start and finish are in the same place.
Yes. The New Forest Hinton Admiral Trail Run course is on this page as a free GPX download — ready to import into Garmin, Wahoo, Komoot, Strava or any other app that reads GPX.
Preparation for New Forest Hinton Admiral Trail Run should account for 21.4 km, 99 m of elevation gain, current training load, and available training time. An adaptive plan helps place key sessions without ignoring recovery and real life.
The pacing strategy for New Forest Hinton Admiral Trail Run should reflect 21.4 km, 99 m of elevation gain, and your current fitness. Start controlled and keep margin for sections where the profile or fatigue makes target pace harder.
New Forest Hinton Admiral Trail Run takes place on March 6, 2027.
New Forest Hinton Admiral Trail Run takes place in Christchurch, United Kingdom.
New Forest Hinton Admiral Trail Run offers 3 distances — 21.4K: 21.4 km; 15.1K: 15.1 km; 10K: 10 km.
Registration runs through the organiser: ukrunningevents.co.uk. YOUB shows you the course, elevation profile and training plan for your preparation.