| From: | United Kingdom 🇬🇧 |
| Date of birth: | 27th December 1998 |
| Age: | 27 years old |
| Gender: | Male |
| Hardest Boulder (Worked): | 9A |
| Hardest Boulder (Flash): | 8B+ |
| Hardest Sport (Worked): | 9b+ |
| Hardest Sport (Onsight): | 8b |
| Hardest Sport (Flash): | 8b+ |
| Notable Partnerships | |
| Aidan Roberts | |
Will Bosi is a climber from Edinburgh in Scotland. He started out as a competition climber, first progressing through national competitions and then European youth comps where he had a string of podium finishes. He struggled somewhat to replicate the successes of the youth comps in the adult circuit, with his best performances being two 4th place finishes in 2019.
Since retiring from comps he has turned to sport climbing and bouldering outdoors, where he has been extremely successful. In 2020 he became the second British climber to climb 9b sport with his repeat of La Capella. He then replicated this success in 2021 with hard first ascents and repeats including among others:
Since 2022 he has focused more on bouldering, where he has also excelled. For example he flashed Charizard 8B+ and, as of 2024, has climbed five 9A boulders:
[1] My Climbing Journey April 2023, https://www.youtube.com/watch?v=ZmmMbpCsSuA
[2] https://www.youtube.com/watch?v=Cn1dJNPfAfc
[3] https://www.climbing.com/people/interview-will-bosi-spots-of-time/
148 recorded ascents.
| Climb | Grade | Style | Ascent Date | Suggested Grade |
|---|---|---|---|---|
| Silence Suggested grade breakdown: 8b+ G 6C M 8C+ M 8A+ B 7C+ G 6B. | 9c | Lead | did not finish | After 1st Jan 2025 | |
References[1] https://www.youtube.com/watch?v=BNAfAujGczo [2] Footage from Will's first trip in 2025 https://www.youtube.com/watch?v=ujb7YRfE-7k |
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| Excalibur Second ascent. 21 sessions. Harder than Return of the Sleepwalker, Terranova and Alphane. | 9b+ | Lead | worked | 3rd Feb 2025 | 9b+ |
|
Exactly 2 years after Stefano Ghisolfi made the first ascent!
References[1] https://www.instagram.com/p/DFsLqiGC1tc/ [2] https://www.ukclimbing.com/news/2025/02/will_bosi_makes_the_second_ascent_of_excalibur_9b+-73894 [3] https://open.spotify.com/episode/1RjDH1oAZkr9epcy4LrA0l? |
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| King Capella First ascent. 10 sessions. | 9b | Lead | worked | 9th Mar 2021 | 9b+ |
|
Three sessions just to work out the first sequence. References[1] https://www.instagram.com/p/CM_596cjKLX/ [2] https://www.youtube.com/watch?v=QXcedGd3R78 [3] https://www.8a.nu/news/king-capella-9b+-fa-and-9b-fa-etc-by-will-bosi-hc28s |
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| La Capella | 9a+ | Lead | worked | 5th Feb 2020 | 9b (soft) |
|
Second ascent of a 9b by a brit, and the first british repeat of an established 9b. |
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| La Furia de Jabali First ascent. | 9a+ | Lead | worked | 4th Feb 2021 | 9b |
| First Ley | 9a+ | Lead | worked | 24th Feb 2021 | |
References |
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| Mutation Second ascent. 40 sessions. | 9a+ | Lead | worked | 31st Oct 2021 | 9a+ |
|
The long awaited second ascent after 4 years and 40 sessions.
References[1] https://www.ukclimbing.com/news/2021/11/first_repeat_of_mutation_9a_by_will_bosi_proposes_9a+-72918 [2] https://www.instagram.com/p/CVxr19WLZRL/ |
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| Brandenburg Gate First ascent. Belayed by Frances Bensley. 8 sessions. | 9a+ | Lead | worked | 7th Nov 2021 | 9a+ (soft) |
References |
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| Free at Last First ascent. | 9a+ | Lead | worked | 25th Jun 2022 | 9a+ |
References |
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| Violent New Breed | 9a+ | Lead | did not finish | ||
References |
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| Rainshadow | 9a | Lead | worked | 2nd May 2016 | |
| Hubble | 9a | Lead | worked | 25th Oct 2016 | 9a |
References |
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| Jungle Speed Fourth go. | 9a | Lead | worked | 9th Apr 2017 | |
| Hunger | 9a | Lead | worked | 3rd Apr 2018 | |
| Last Night First ascent. | 9a | Lead | worked | 6th Feb 2021 | |
| Estado CrĂtico | 9a | Lead | worked | 24th Feb 2021 | |
| La Ley Indignata | 9a | Lead | worked | 2nd Mar 2021 | |
References |
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| Northern Lights Belayed by Ben Moon. 2 sessions. | 9a | Lead | worked | 11th Jun 2021 | |
| Roofolution | 9a | Lead | worked | Mar 2022 | |
| Stevolution | 9a | Lead | worked | 17th Mar 2022 | |
| The Southern Hooligan First ascent. | 9a | Lead | worked | May 2022 | |
References |
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| Spots of Lime First ascent. 2 sessions. Easier than Brandenburg Gate. | 9a | Lead | worked | Aug 2025 | |
| A Muerte | 8c+ | Lead | worked | 18th Apr 2017 | |
| Evolution Third go. | 8c+ | Lead | worked | 4th Jul 2017 | |
| The Wild West Second ascent? | 8c+ | Lead | worked | 23rd May 2021 | |
References |
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| Persian Dawn Third ascent. | 8c+ | Lead | worked | 10th Nov 2021 | |
| Hooligan | 8c+ | Lead | worked | 17th Nov 2021 | 8c+ |
References |
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| Progress | 8c+ | Lead | worked | 17th May 2025 | 8c+ (soft) |
| Malcolm In The Middle Second ascent? | 8c+ | Lead | worked | 31st May 2025 | |
| Transform Fourth ascent. | 8c | Lead | worked | 2nd Jul 2015 | |
References |
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| Make it Funky 1 session. | 8c | Lead | worked | 30th Nov 2017 | |
| Seraphim | 8c | Solo | worked | 19th Nov 2021 | 8c |
References[1] https://www.8a.nu/crags/sportclimbing/united-kingdom/peak-district/sectors/raven-tor/routes/seraphim |
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| Reverberance First ascent. | 8c | Lead | worked | 2023 | 8c/8c+ |
References |
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| The Free Ranger First ascent. | 8c | Lead | worked | Jun 2025 | |
References |
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| El MĂłn de SofĂa | 8b+ | Lead | flash | 11th Apr 2017 | |
| Land Der Hämmer | 8b | Lead | onsight | 2023 | |
References |
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| Climb | Grade | Style | Ascent Date | Suggested Grade |
|---|---|---|---|---|
| Will's Project | 9A+ (approx) | Boulder | did not finish | 9A+ | |
| Alphane Third ascent. Around 13 sessions. Easier than Honey Badger. | 9A | Boulder | worked | 31st Oct 2022 | 9A (soft) |
|
Before the first ascent Will had been playing on the boulder with Dave Graham and trying some of the moves. At the time the line seemed too futuristic so he didn't dedicate to it. After Shawn Raboutou made the first ascent Will got psyched on the line again and headed out with Aidan Roberts, initially just to try the line and then, when he made quick progress, to send it.
References[1] https://www.instagram.com/p/CkdgyVDDNAZ/ [2] https://www.ukclimbing.com/news/2022/11/will_bosi_claims_the_third_ascent_of_alphane-73186 |
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| Burden of Dreams Second ascent. 14 sessions. | 9A | Boulder | worked | 12th Apr 2023 | 9A |
|
The long-awaited second ascent after 24 days of work, with 10 sessions on a replica created using 3d scans of the holds and then 14 sessions on the real thing. References[1] https://www.instagram.com/p/CrAtt4YtyXc/ [2] https://www.ukclimbing.com/news/2023/04/first_repeat_of_burden_of_dreams_9a_by_will_bosi-73279 [4] https://open.spotify.com/episode/4F0rw3OCCtjOTO9pPCREGg [5] https://www.instagram.com/p/CrGeNBatv6G/ |
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| Return of the Sleepwalker Second ascent. 12 sessions. | 9A | Boulder | worked | 19th Feb 2024 | 9A (soft) |
|
12 sessions in total, including 3 spent on the stand start Sleepwalker, completed during a single trip to try the boulder.
References[1] https://www.ukclimbing.com/news/2024/02/return_of_the_sleepwalker_9a_for_will_bosi-73602 [2] https://www.instagram.com/p/C3nLKdJrZCC/?img_index=1 [3] https://open.spotify.com/episode/3PwOTtkyJJ3IM0A8MxUemD? |
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| Spots of Time Second ascent. 8 sessions. | 9A | Boulder | worked | 19th Oct 2024 | 9A |
References[1] https://www.instagram.com/p/DBY4dyjtLCn/?img_index=1 [2] https://www.ukclimbing.com/news/2024/10/will_bosi_repeats_spots_of_time_9a-73826 [3] https://www.youtube.com/watch?v=cg5G1rZGyx0 [4] https://open.spotify.com/episode/7nCV4T3tL2t6rbKgIW1yw4? |
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| Realm of Tor’ment First ascent. Similar To Spots of Time. Harder than Brain Rot and Ephyra. | 9A | Boulder | worked | 11th May 2025 | 9A (soft) |
References[1] Press release /file/e85dc179-1c14-6a29-c466-81f955348780/PRESS RELEASE_BOSI_9A FIRST ASCENT_PEAK DISTRICT.pdf [2] https://www.instagram.com/p/DJ4S7KMoLpV/ [3] https://www.ukclimbing.com/news/2025/05/will_bosi_establishes_realm_of_torment_9a-73972 |
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| Honey Badger First ascent. Harder than Alphane. | 8C+ | Boulder | worked | 10th Aug 2022 | 8C+ (hard) |
References[1] https://www.youtube.com/watch?v=wtSeQ8Xm3mw [2] https://www.patreon.com/posts/mastery-extras-80893007 [3] https://www.ukclimbing.com/news/2022/11/will_bosi_claims_the_third_ascent_of_alphane-73186 |
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| Ephyra Around 3 sessions. | 8C+ | Boulder | worked | 8th Nov 2022 | 8C/8C+ |
| The Wild South First ascent. | 8C+ | Boulder | worked | 26th Apr 2023 | 8C+ |
References[1] https://www.youtube.com/watch?v=zf16iiXqOT8 [2] https://www.climbing.com/people/interview-will-bosi-spots-of-time/ |
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| Isles of Wonder SDS Second ascent. | 8C+ | Boulder | worked | 21st May 2023 | 8C |
|
Will used different beta to Aidan (keeping the right heel in to match the left hand in) which he felt was more 8C than the 8C+ that Aidan proposed. References |
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| Sleepwalker 3 sessions. | 8C+ | Boulder | worked | 20th Jan 2024 | 8C |
|
Will was close to climbing the problem on his second session, dropping it with his right hand in the slot and left hand on the sloper. He then did it on the first go of his third session. References |
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| Marra Time Sit | 8C+ (approx) | Boulder | did not finish | 2025 | 8C+ |
References |
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| Serenata | 8C | Boulder | worked | 3rd Sep 2020 | |
References |
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| Ulls de Bruixa First ascent. | 8C | Boulder | worked | 11th Feb 2021 | |
| Foundation's Edge 1 session. | 8C | Boulder | worked | 23rd Sep 2021 | 8C |
| Drift | 8C | Boulder | worked | 27th Mar 2022 | 8C (soft) |
References |
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| Pata Ledovce | 8C | Boulder | worked | 4th Apr 2022 | |
References |
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| Bulbasaur First ascent. | 8C | Boulder | worked | 7th Apr 2022 | |
References |
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| Ghost Rider | 8C | Boulder | worked | 9th Apr 2022 | |
| Tekuté Štěstà | 8C | Boulder | worked | 11th Apr 2022 | |
References |
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| Iceberg | 8C | Boulder | worked | 12th Apr 2022 | |
References |
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| Silent Singer | 8C | Boulder | worked | 6th Jun 2022 | |
References |
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| Trance First ascent. | 8C | Boulder | worked | 9th Jun 2022 | 8C |
References |
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| Beautiful Mind First ascent. | 8C | Boulder | worked | 14th Jul 2022 | |
References |
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| Forgotten Gem | 8C | Boulder | worked | 6th Nov 2022 | 8C |
| Dreamtime Fourth go. | 8C | Boulder | worked | 6th Dec 2022 | |
|
Will was close on the flash, slipping off after the crux! He finished the problem off on his fourth try. References |
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| Ultra Instinct | 8C | Boulder | worked | 8th Jun 2023 | 8C |
References |
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| Nova Second ascent. 6 sessions. | 8C | Boulder | worked | 6th Nov 2023 | 8C |
References |
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| Kráter | 8C | Boulder | worked | Nov 2024 | 8C/8C+ |
References |
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| Asagimadara | 8C | Boulder | worked | 5th Dec 2024 | |
| El Dorado Sit First ascent. | 8C | Boulder | worked | 11th Mar 2025 | |
| Brain Rot First ascent. | 8C | Boulder | worked | 19th Apr 2025 | 8C+ |
References |
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| Kyanite First ascent. | 8C | Boulder | worked | 25th Apr 2025 | |
| Captain Nemo | 8C | Boulder | worked | 1st May 2025 | |
| Pretence of Youth Second ascent. | 8C | Boulder | worked | 16th May 2025 | 8C (soft) |
References |
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| Remote Working First ascent. Harder than Pretence of Youth. | 8C | Boulder | worked | 4th Jun 2025 | 8C |
| Monk Life | 8B+ | Boulder | worked | 19th Oct 2015 | |
References |
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| Practice of the Wild | 8B+ | Boulder | worked | 27th Sep 2018 | 8C |
References |
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| Bewilderness Fourth go. | 8B+ | Boulder | worked | 2nd Jun 2020 | |
References |
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| Tomahawk | 8B+ | Boulder | worked | 26th Jun 2020 | |
| Superman SDS | 8B+ | Boulder | worked | 6th Jul 2020 | |
| Dandelion Mind | 8B+ | Boulder | worked | 17th Jul 2020 | 8B+ |
| Bhai Po | 8B+ | Boulder | worked | 1st Mar 2021 | |
| Hazel Grace | 8B+ | Boulder | worked | 27th Sep 2021 | |
| Highlander | 8B+ | Boulder | worked | 28th Sep 2021 | 8B+ |
References |
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| Gepresster Hase | 8B+ | Boulder | worked | 28th Sep 2021 | 8B+ |
References |
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| Scarred For Life | 8B+ | Boulder | worked | 11th Oct 2021 | |
| Little Women | 8B+ | Boulder | worked | 2022 | 8B (hard) |
References |
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| Below Zero First ascent. | 8B+ | Boulder | worked | 16th Jan 2022 | |
References |
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| Limit Breaker Second ascent. | 8B+ | Boulder | worked | 11th Feb 2022 | 8B+ |
References |
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| Weeding the Lip | 8B+ | Boulder | worked | 15th Mar 2022 | 8B+ |
References |
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| Charizard | 8B+ | Boulder | flash | 7th Apr 2022 | |
References |
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| Prehistorik | 8B+ | Boulder | worked | 28th Apr 2022 | |
| Raggamuffin | 8B+ | Boulder | worked | 13th Aug 2022 | 8B+ |
|
Will broke a foothold on his first go which made the sit unfeasible. However he then did the problem from a crouch start and suggested 8B+ for this. References |
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| Crescendo | 8B+ | Boulder | worked | 24th Aug 2022 | 8B |
|
Will used some different beta which he found a little easier than the original sequence. References |
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| Crescendo SDS First ascent. | 8B+ | Boulder | worked | Sep 2022 | 8B+ |
References |
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| Big Paw | 8B+ | Boulder | worked | Dec 2022 | |
| Graceland | 8B+ | Boulder | flash | 7th Feb 2023 | 8B (hard) |
| World at War | 8B+ | Boulder | worked | Jun 2023 | 8B+ |
References |
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| Sedni Si Na Kost | 8B+ | Boulder | worked | Sep 2023 | |
References |
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| Bultitude Second ascent. 1 session. | 8B+ | Boulder | worked | Apr 2024 | 8B+ |
| Mito SDS Second ascent. | 8B+ | Boulder | worked | 16th Apr 2024 | 8B+ (hard) |
References |
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| Last Wave Goodbye SDS First ascent. 1 session. | 8B+ | Boulder | worked | Jul 2024 | |
References |
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| Harambe First ascent. | 8B+ | Boulder | worked | Jul 2024 | 8B+ |
| Last Wave Goodbye 1 session. | 8B+ | Boulder | worked | Jul 2024 | |
|
First go after warming up on the moves. |
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| Dente de TubarĂŁo Low First ascent. | 8B+ | Boulder | worked | Sep 2024 | |
| Gaston LeGume 1 session. | 8B+ | Boulder | worked | Sep 2024 | |
| Dune | 8B+ | Boulder | flash | 28th Oct 2024 | 8B+ |
|
Some of the holds have broken/deteriorated since Jana Švecová made the first ascent which is why Will suggested an upgrade. References |
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| Janja SD | 8B+ | Boulder | flash | 30th Oct 2024 | |
| Decided 1 session. | 8B+ | Boulder | worked | 3rd Dec 2024 | |
| HĹŤtĹŤ | 8B+ | Boulder | worked | 9th Dec 2024 | |
References |
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| Belly Full of Nachos | 8B+ | Boulder | worked | 28th Feb 2025 | 8B/8B+ |
References |
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| Ninjutsu | 8B+ | Boulder | worked | 12th Apr 2025 | |
| Axinite | 8B+ | Boulder | worked | 12th Apr 2025 | |
| Space Cadet | 8B+ | Boulder | worked | 23rd Apr 2025 | |
References |
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| Embrace Gravity | 8B+ | Boulder | worked | 27th Apr 2025 | |
| Mortal Immortal | 8B+ | Boulder | worked | 13th May 2025 | 8B+ (soft) |
| Copperline Second ascent. | 8B+ | Boulder | worked | Nov 2025 | 8B+/8C |
| Isla de Encanta | 8B | Boulder | flash | 19th Sep 2020 | |
|
Milk It Indoor |
8B | Boulder | worked | 2021 | |
|
Perky Pinky Indoor |
8B | Boulder | worked | 2021 | 8A+ |
| Fat Lip | 8B | Boulder | worked | 5th Dec 2021 | |
References |
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| Voyager | 8B | Boulder | worked | 20th Jan 2022 | 8B+ |
|
Will was the first to repeat it post break and suggested the boulder was more on the 8B+ side now.
References |
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| Home | 8B | Boulder | worked | 23rd Jan 2022 | |
| Flipnic | 8B | Boulder | worked | 7th Mar 2022 | 8B/8B+ |
| 4X+1 | 8B | Boulder | flash | 7th Mar 2022 | |
| Flip Flopera Third go. | 8B | Boulder | worked | 7th Mar 2022 | |
|
Third go after getting tantalisingly close on the flash. References |
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| Snatch Low First ascent. | 8B | Boulder | worked | 10th Mar 2022 | |
References |
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| Leda Kost | 8B | Boulder | worked | 25th Mar 2022 | |
| SvinĂ Mor | 8B | Boulder | flash | 27th Mar 2022 | |
References |
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| Outliers Second ascent. | 8B (approx) | Boulder | worked | 12th Jun 2022 | 8C |
References |
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| Vecchio Leone | 8B | Boulder | flash | 2nd Nov 2022 | |
| The Dagger | 8B | Boulder | flash | 6th Dec 2022 | 8B/8B+ |
References |
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| Flash Flood | 8B | Boulder | flash | 8th Dec 2022 | |
| Somnolence | 8B | Boulder | worked | 1st Feb 2023 | 8B (hard) |
| Godzilla SDS | 8B | Boulder | flash | Jun 2023 | |
| Giuliano First ascent. | 8B | Boulder | worked | Sep 2023 | |
References |
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| Needle and Rabbit First ascent. | 8B | Boulder | worked | 24th Aug 2024 | |
| Dente de TubarĂŁo First ascent. | 8B | Boulder | worked | Sep 2024 | |
| Rustam Direct | 8B | Boulder | flash | 7th Nov 2024 | |
| A Bigger Belly | 8B | Boulder | worked | Feb 2025 | |
References |
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| Dulcifer | 8A+ | Boulder | worked | 3rd Oct 2021 | |
| Red Snapper | 8A+ | Boulder | flash | 3rd Oct 2021 | |
References |
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| Keen Roof | 8A+ | Boulder | worked | 19th Nov 2021 | |
| Helicoidal Flow | 8A+ | Boulder | worked | 2024 | 8B |
| Lethal Design | 8A+ | Boulder | flash | 10th Mar 2024 | |
| Xuta Cavalo | 8A+ | Boulder | flash | Sep 2024 | 8A (hard) |
| Cavaleiro Negro | 8A+ | Boulder | flash | Sep 2024 | |
| El Dorado First ascent. | 8A+ | Boulder | worked | 4th Mar 2025 | |
| The Prow | 8A | Boulder | worked | 30th Jul 2017 | |
References |
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| Sundial Second ascent. | 8A | Boulder | worked | Before 12th Apr 2025 | |
| Climb | Grade | Style | Ascent Date | Suggested Grade |
|---|---|---|---|---|
| Dolphin Wall Second go. | E8 | Lead | ground up | 19th Jul 2024 | |
|
Will dropped the crux on first go then fired it off next effort. His first trad fall! |
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| Climb | Grade | Style | Ascent Date | Suggested Grade |
|---|---|---|---|---|
| Milk It | 8B | Boulder | worked | 2021 | |
| Perky Pinky | 8B | Boulder | worked | 2021 | 8A+ |