Silivri Ultra Trail

It takes place on 4 April 2027; the start is at 07:00. Start times by distance: 38K 07:00 · 18K 08:30 · 8K 10:00.

Start: Danamandıra Nature Park, Silivri, Istanbul.

There are 3 distances: 8K, 18K, 38K.

Yes, registration is open. The registration deadline is 28 March 2027. Registration is handled on the organiser’s official page; the «Official Registration» button on this page links there.

Official website: silivriultratrail.com. Registration is handled via hermesentry.com.

8K: 8.1 km, 72 m of climbing · 18K: 18.0 km, 128 m of climbing · 38K: 38.2 km, 351 m of climbing. Values are measured from the organiser's published course files.

From easiest to hardest: 8K (km-effort 9, XXS) → 18K (km-effort 19, XXS) → 38K (km-effort 42, XS). Ranked by km-effort (kilometres plus 1 for every 100 m of climbing), measured from the course files.

Over 38.2 km there is 351 m of climbing in total, 9 m per kilometre. About 78% of the course is flat. Essentially flat: a course for holding a steady pace. Km-effort is 42, which puts it in the XS category on the ITRA scale. This value is calculated from the course file. Official ITRA scores are awarded only by ITRA, and only to races registered and certified with it; this number is not that score. The value is close to a category boundary: with the organiser’s stated distance and climbing it may fall into the S category. By km-effort it is harder than 58 of the 97 courses whose files we have measured in the calendar; difficulty rank: 38.

Share of the distance: 9% climbing (3–8%) · 81% flat · 10% descending (3–8%). Gradient was measured at equal intervals from the elevation in the course file.

There is 351 m of descent in total. The longest uninterrupted descent is between km 14.6 and km 21.2: 57 m.

Splits where the climbing is concentrated: 0.0–5.1 km +47 m; 5.1–10.1 km +75 m; 10.1–15.0 km +71 m; 15.0–20.1 km +38 m; 20.1–25.1 km +64 m; 25.1–30.0 km +17 m; 30.0–35.1 km +33 m. The most climbing is between km 5.1 and 10.1 (+75 m). The highest point is at km 24.7 (249 m).

The highest point is 249 m, at km 24.7. The lowest point is 166 m. From the high point it is 14 km to the finish.

About 65% of the climbing is in the first half; the hard part comes early.

Start and finish are at the same point; the course is a single loop.

Over 8.1 km there is 72 m of climbing in total, 9 m per kilometre. About 83% of the course is flat. Essentially flat: a course for holding a steady pace. Km-effort is 9, which puts it in the XXS category on the ITRA scale. This value is calculated from the course file. Official ITRA scores are awarded only by ITRA, and only to races registered and certified with it; this number is not that score. By km-effort it is harder than 15 of the 97 courses whose files we have measured in the calendar; difficulty rank: 81.

Share of the distance: 12% climbing (3–8%) · 76% flat · 12% descending (3–8%). Gradient was measured at equal intervals from the elevation in the course file.

Splits where the climbing is concentrated: 4.0–5.0 km +35 m; 7.0–8.1 km +21 m. The most climbing is between km 4.0 and 5.0 (+35 m). The highest point is at km 5.3 (203 m).

Over 18.0 km there is 128 m of climbing in total, 7 m per kilometre. About 87% of the course is flat. Essentially flat: a course for holding a steady pace. Km-effort is 19, which puts it in the XXS category on the ITRA scale. This value is calculated from the course file. Official ITRA scores are awarded only by ITRA, and only to races registered and certified with it; this number is not that score. By km-effort it is harder than 33 of the 97 courses whose files we have measured in the calendar; difficulty rank: 62.

Share of the distance: 3% climbing (3–8%) · 92% flat · 6% descending (3–8%). Gradient was measured at equal intervals from the elevation in the course file.

Splits where the climbing is concentrated: 0.0–5.0 km +61 m; 5.0–10.1 km +30 m; 10.1–15.0 km +32 m. The most climbing is between km 0.0 and 5.0 (+61 m). The highest point is at km 11.6 (234 m).

Yes. The organiser's course file is in the Course and Map section on this page; you can load it onto your watch or phone.

Finish (km 8): 2 h. Runners who do not reach a point by its cut-off time are taken out of the race. To reach Finish at km 8 within the cut-off, an average pace of 15:00 min/km is enough. This is a flat calculation; climbs and aid-station stops take extra time.

Finish (km 18): 4 h. Runners who do not reach a point by its cut-off time are taken out of the race. To reach Finish at km 18 within the cut-off, an average pace of 13:20 min/km is enough. This is a flat calculation; climbs and aid-station stops take extra time.

Finish (km 38.2): 7 h. Runners who do not reach a point by its cut-off time are taken out of the race. To reach Finish at km 38.2 within the cut-off, an average pace of 10:59 min/km is enough. This is a flat calculation; climbs and aid-station stops take extra time.

Finish cut-off — 8K: 2 h · 18K: 4 h · 38K: 7 h. Runners who do not reach the finish by the finish cut-off are not ranked.

km 11.0 CP1 Sinekli Göleti (su + yiyecek); km 19.6 CP2 Çayırdere (su + yiyecek); km 27.8 CP3 Sayalar (su + yiyecek); km 33.5 CP4 Gürgen Tepe (su + yiyecek). The longest stretch without aid is about 11 km; carry water for it.

38K: required – a medical certificate issued within the last 6 months stating there is no objection to running/athletics, or a current athlete licence (athletics, triathlon, mountaineering, orienteering). 8K and 18K: a wet-signed waiver, a medical certificate from the last 12 months or an athlete licence.

Over the last five years these dates averaged a low of 8 °C and a high of 16 °C; it rained on about 52% of days and the average max wind was 18 km/h.