Gray Course

82.0km·4090m+/4090m−

April 26

Herceg Novi,

Montenegro

itra·source

Set your ITRA PI

Estimated Finish

13:20:02

ITRA PI

Segment Details

1/10

+11.3% · 0.90km · 102m+ · 0m-

123m21m

0.00km0.90km

OSM ↗

highway

residential 51%steps 31%footway 12%service 6%

tunnel

yes

surface

asphalt 51%concrete 14%sett 9%

lit

yes

width

1.5

handrail

no 17%yes 14%

incline

up 22%down 9%

layer

-1

ramp

Elevation Profile

Trail 73% · Technical 2%Technical 2%

2.8TDI

81.8km

117.2FlatKM

3948m+

3951m−

1583max

4min

0:05

0.5km

0:41

4.0km

0:54

5.5km

2:28

13.5km

1:12

11.2km

1:34

12.2km

1:25

10.1km

2:39

9.0km

1:29

9.1km

0:53

6.7km

OSM

AID

Distance

Time

Gain

Loss

Gels

Water

Salts

Segment

0.5km/0.5km

0:05/0:05

65m+

0m−

0.1×40g(3g)

0.1L

0(0mg)

4.5km/4.0km

0:46/0:41

404m+

0m−

0.7×40g(28g)

0.5L

1(200mg)

10.0km/5.5km

1:40/0:54

674m+

4m−

0.9×40g(36g)

0.7L

2(400mg)

23.5km/13.5km

4:07/2:28

781m+

366m−

2.5×40g(100g)

1.9L

5(1000mg)

34.7km/11.2km

5:20/1:12

99m+

573m−

1.2×40g(49g)

0.9L

2(400mg)

46.9km/12.2km

6:54/1:34

168m+

682m−

1.6×40g(63g)

1.2L

3(600mg)

57.0km/10.1km

8:19/1:25

237m+

310m−

1.4×40g(57g)

1.1L

3(600mg)

66.0km/9.0km

10:58/2:39

568m+

237m−

2.7×40g(108g)

2.0L

5(1000mg)

75.1km/9.1km

12:27/1:29

416m+

370m−

1.5×40g(60g)

1.1L

3(600mg)

81.8km/6.7km

13:20/0:53

0m+

887m−

0.4×40g(16g)

0.7L

2(400mg)

AID

Distance

Time

Gels

Water

Salts

Gradient Matrix

Extra

Select a gradient

Uphill

Downhill

>40%

30%

25%

20%

15%

10%

0.5

0.3

0.2

0.3

0.5

Uphill

>40%

30%

25%

20%

15%

10%

0.2

0.3

0.5

10%

15%

20%

25%

30%

>40%

Downhill

Technical sections presentDarker — steeper and longer

Extremes

Gradient Breakdown

42% / 34.8km16% / 13.2km41% / 33.8km

Uphill

15–20%×56.0km

10–15%×911.7km

3–10%×1717.1km

Downhill

20–25%×11.4km

15–20%×54.5km

10–15%×76.1km

3–10%×1821.7km

Peaks for this course have not been detected yet.

Skyrunning · ISFSource

ISF technical requirements

Average incline4.8%> 6.0%

Steep sections (30%+)0.0%≥ 5.0%

Max altitude1583 m> 2000 m

Vertical climb3948 m> 1300 m

Asphalt15.4%< 15.0%

UIAA Technical climbing0.0 kmGrade I–II

Possible levelnot enough requirements met to estimate a level

Level 10/1

Peak reachno detection

Level 20/3

Altitude ≥ 3000 m1583 m

Scrambling0 m

Rocky footing0 m

Level 30/3

Via ferrata0 m

Glacier0 m

Exposed ridge0 m

About Gray Course

Gray Course is a 82.0 km ultra trail of Boka Bay Trail 2025 in Herceg Novi, Montenegro. The race starts on April 26, 2025. The course climbs 4090 m+ and descends 4090 m−, between a low point of 4 m and a high point of 1583 m. By gradient, 42% of the distance is uphill, 41% downhill and 16% flat. The longest climb runs 9.9 km at an average 11.5% grade (1142 m of vertical). The longest descent runs 6.8 km at 13.3% (904 m of vertical). Surface: 73% trail, 15% road, and 10% smooth. Flat-equivalent effort: 117.2 FlatKM.

32 finishers completed the 2025 edition. Men's winner: Vladimir Samoilov (Serbia) in 10:59:49. Women's winner: Sonja Muittari (Finland) in 13:08:32.

This page has the full results and splits, interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for Gray Course.

Other distances of Boka Bay Trail 2025Red Course (59.0 km)·Blue Course (33.0 km)·Green Course (17.0 km)

Other editions of Gray Course2026

Official websitewww.bokabaytrail.com