William Bosi

United Kingdom • Sport climber
    Community profile
  • Grade context: UK
  • Ascents: 166
  • Photos: 1
  • Followers: 26
red pointed
successful ascents
distance climbed

Community Managed Account

This is a community managed profile for William Bosi as a climber of significance. If you are William Bosi and want to claim this account please email

About William Bosi

William Bosi is a professional sport climber from Great Britain. Born in 1998 in 2020 he became the second British to ever climb a route graded 9b. He is also competing in the IFSC World Cup.


Notable ascents

By style By type Diff. band Ascents Hardest ascent
Sport Red point
60 9b+ King Capella 2 years ago
15 8b+ El Món de Sofía 6 years ago
15 8b Cronica 6 years ago
Boulder Send
60 9A Burden of Dreams 5 months ago
9A Alphane 10 months ago
14 8B+ The Dagger 9 months ago
8B+ Charizard about a year ago
By area Diff. band Ascents Hardest ascent
28 9b+ King Capella 2 years ago
Peak District Limestone
26 8C+ Honey Badger about a year ago
Malham Cove
21 9a Rainshadow 7 years ago
13 9a+ La ley indignata 2 years ago
9a+ First ley 2 years ago
11 8b+ Slow food 10 years ago

Climber Performance Rating (CPR) Timelines

For help understanding the CPR timeline chart see the CPR timeline explained article.

Sport timeline (ascents)

Boulder timeline (ascents)

grade pyramids

Sport 89 ascents

9b+ 1
9b 2
9a+ 5
9a 4
8c+ 6
8c 6
8b+ 5
8b 11
8a+ 9
8a 13
7c+ 5
7c 4
7b+ 5
7b 2
7a+ 6
7a 5
  Onsight   Flash   Red point   Other

Grades: French

Boulder 72 ascents

9A 2
8C+ 2
8C 17
8B+ 12
8B 19
8A+ 7
8A 13
  Flash   Send   Other

Grades: Fontainebleau

Trad 1 ascent

5.12c 1
  Red point   Other

Grades: YDS

Climbs with

Have you climbed with William Bosi? Don't forget to mention @williambosi when logging your ascents

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