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Know the route.
Be ready for it.

Plan a trek or a day on the trails, prepare for trail races and marathons, and see what your runs say about the terrain you train on.

Plan a route Find a race

Free route planning and GPX export. Explore before you create an account.

Example course EUT53 · Engadin Ultra Trail 2027

Long climbs: +790 m km 2.5–8.6+930 m km 14.5–21.8

1234Startkm 52.6

53.3 km · +2,639 m · 4 aid stations · 13 h cut-off

4 aid stations and their cut-offs
  1. 1 Zuoz, La Resgia, km 14.4 · cut-off 3 h 15
  2. 2 Chamanna d'Es-cha, km 21.8
  3. 3 Bever, school building, km 35.1 · cut-off 8 h 30
  4. 4 Alp Muntatsch, km 41.2

Distance and climb: the organizer's. Profile: our mapped line (52.6 km), the 2026 course until the 2027 one is verified. Map data © OpenStreetMap contributors.

Prepare for your next start line

What does this race ask of you? A race page with a mapped course answers it in three steps. Here is EUT53:

  1. 1 · The course See where the long climbs fall The map, elevation profile and aid stations, a 3D flyover, and the GPX for your watch.
  2. 2 · The training Train for this course A free 16-week plan fitted to the running you do now, with this course's climbing.
  3. 3 · Race day Plan your race day Choose a finish time and see when you reach each aid station, and your margin to its cut-off. Starting point: finish in 9 h 30 Zuoz, La Resgia, km 14.443 min spareBever, school building, km 35.12 h 14 spare 08:00 start, 3-minute stops, a typical finish for this length, not yours: type your own target there.

Races with a full 16-week build window

Browse trail races and marathons →

See what your training means on the trail

Your week in distance, time and climbing, and the climbs you repeat: how your time on them changes, with what it can and cannot tell you.

Sample · an invented runner

One climb they run every Saturday

13:4814:2615:03Oct
Higher is faster your usual range ★fastest heart rate, lower to higher

The latest effort, 13:48, is 24 s quicker than this runner's typical 14:12 here, the fastest of 5, at a lower heart rate. A hint to watch, not proof of fitness.

Then try your own FIT, GPX or TCX files: they are read in your browser and nothing is uploaded.

Try a sample history Use your own files

Train with Intervals.icu? Connect it to bring in each new run and send planned workouts to your watch.

Plan the days. Take the trip offline.

Choose a long-distance trail and how many days you have. The guide splits it into walking days with places to sleep; save your days as a trip and prepare it for offline use on your phone.

Plan your next trek

How offline trips work All trail guides

Example trip Tour du Mont Blanc 164.5 kmwalking 10,096 mascent 11 dayson foot Reviewed 11-day plan, 14 September 2026. Open the guide and choose your days →

Start with the route or file you have

  • Plan a route or a loop Draw it on trails or ask for a loop of the length you want, check the climbs, export the GPX. Open the Planner Make a loop
  • Fix or merge a GPX Shrink it for your watch, join several, see its profile. Your file stays in your browser. Simplify Merge Profile
  • Fly a course in 3D Watch any route over real terrain before you go, and share the view. 3D flyover

All tools →

Good to know

What does TrailSplits cost?

Planning routes and exporting GPX, the trail guides, the race pages, the training plans and the tools are free to use, and Planner GPX export stays free. The developer API has its own plans.

Do I need an account?

No account is needed to plan and export routes, read the guides and race pages, build a training plan or use the tools. Signing in with an email link keeps your routes, plans and trips on every device, and is needed to sync training data from Intervals.icu.

Does it work without signal?

Add TrailSplits to your phone's home screen, then download a trip or a race course while you have signal. The trip page tells you when it is ready on that phone. The recorder works while TrailSplits is on screen; for recording in the background, use a watch.

Which watches and apps does it work with?

Routes and courses download as standard GPX files, which Garmin, COROS, Suunto and most navigation apps import. Planned workouts reach the watch through Intervals.icu for the brands it supports, such as Garmin.

Where do the maps and race facts come from?

Maps and routing use OpenStreetMap and open terrain data. Race dates, distances, aid stations and cut-offs come from each organizer's published pages, with the date we checked them. TrailSplits is independent and is not the organizer of any race.

What happens to my files?

The GPX tools and the training preview read your files in your browser and do not upload them. Planning a route, heights and weather send the route's coordinates to TrailSplits' own servers to work them out.

Organizing a race? Put your course, profile and aid stations on your own website. For organizers

Building an outdoor app? Routing, terrain and weather for trails, through an API. For developers