Gray Course

83.0km·4100m+/4100m−

April 26, 01:00 AM

Herceg Novi,

Montenegro

itra·source

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Estimated Finish

13:03:18

ITRA PI

Segment Details

1/8

+11.3% · 0.90km · 102m+ · 0m-

123m21m

0.00km0.90km

OSM ↗

highway

residential 52%steps 34%footway 7%service 6%

surface

asphalt 52%concrete 14%sett 9%

lit

yes

width

1.5

handrail

no 17%yes 14%

incline

up 22%down 9%

ramp

Elevation Profile

Trail 73% · Technical 2%Technical 2%

2.6TDI

81.8km

115.2FlatKM

3948m+

3951m−

1583max

4min

1:42

10.5km

2:31

12.8km

1:10

11.3km

1:37

11.9km

1:20

10.2km

2:25

9.5km

1:28

8.9km

0:50

6.7km

OSM

AID

Distance

Time

Gain

Loss

Gels

Water

Salts

Segment

10.5km/10.5km

1:42/1:42

1151m+

17m−

1.8×40g(70g)

1.3L

3(600mg)

23.3km/12.8km

4:13/2:31

772m+

345m−

2.6×40g(104g)

1.9L

5(1000mg)

34.6km/11.3km

5:23/1:10

94m+

580m−

1.2×40g(48g)

0.9L

2(400mg)

46.5km/11.9km

7:00/1:37

171m+

676m−

1.7×40g(67g)

1.2L

3(600mg)

56.7km/10.2km

8:20/1:20

231m+

316m−

1.4×40g(55g)

1.0L

3(600mg)

66.2km/9.5km

10:46/2:25

595m+

237m−

2.5×40g(100g)

1.8L

5(1000mg)

75.1km/8.9km

12:13/1:28

397m+

370m−

1.5×40g(61g)

1.1L

3(600mg)

81.8km/6.7km

13:03/0:50

0m+

887m−

0.3×40g(14g)

0.6L

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

Asphalt15.3%< 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 83.0 km ultra trail of Boka Bay Trail 2026 in Herceg Novi, Montenegro. The race starts on April 26, 2026 at 01:00 AM. It starts in Herceg Novi. The course climbs 4100 m+ and descends 4100 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: 115.2 FlatKM.

21 finishers completed the 2026 edition. Men's winner: Guntis Smaukstelis (Latvia) in 11:01:05. Women's winner: Ivana Cenerić (Serbia) in 13:43:12.

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 2026Red Course (59.8 km)·Blue Course (33.5 km)·Green Course (17.1 km)·Yellow Course (7.8 km)

Other editions of Gray Course2025

Official websitewww.bokabaytrail.com