Cho Oyu | 2025 NW side

A USA expedition to Cho Oyu in 2025 via NW side, led by Garrett Madison. Summit reached on 13th October 2025. 10 members recorded.

Expedition Details

Change history — how this expedition, its members and references have changed between database releases.

Field	Value
ID	3763
Imported	2026-11-04 22:32:23.994980
Expedition ID	CHOY25306
Peak ID	CHOY
Year	2025
Season	3
Host Country	2
Route 1	NW side
Route 2	-
Route 3	-
Route 4	-
Nationality	USA
Leaders	Garrett Madison
Sponsor	Madison Mountaineering Cho Oyu Expedition 2025
Success 1	True
Success 2	False
Success 3	False
Success 4	False
Ascent 1	-
Ascent 2	-
Ascent 3	-
Ascent 4	-
Claimed	False
Disputed	False
Countries	UK
Approach	Ktm->Kodari->Tingri->BC
Basecamp Date	-
Summit Date	2025-10-13
Summit Time	0733
Summit Days	0
Total Days	0
Termination Date	-
Termination Reason	1
Termination Notes	-
High Point (m)	8188
Traverse	False
Ski	False
Paraglide	False
Camps	2
Fixed Rope (m)	0
Total Members	4
Summit Members	4
Member Deaths	0
Total Hired	6
Summit Hired	6
Hired Deaths	0
No Hired	False
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Taken	False
O2 Unknown	False
Other Summits	-
Campsites	BC,ABC,C1,C2,Smt(13/10)
Route Notes	-
Accidents	-
Achievement	-
Agency	Himalayan Guides
Commercial Route	True
Standard Route	True
Primary Route	False
Primary Member	False
Primary Reference	False
Primary ID	-
Checksum	2464292
Year	2025
Summit Success	True
O2 Summary	Used
Route (lowercase)	nw side

Members

Field	Value
ID	26764
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	01
Peak ID	CHOY
Year	2025
Season	3
First Name	Garrett Christian
Last Name	Madison
Sex	M
Age	0
Birth Date	-
Year of Birth	1978
Calculated Age	46
Citizenship	USA
Status	Leader
Residence	Seattle, Washington
Occupation	Alpine guide
Leader	True
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0815
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	No attempt on Lhotse after summiting Everest
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2441732
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	garrett christian madison
Year of Birth	1978
Year	2025
Age at Expedition	47
Role	Leader

Field	Value
ID	26765
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	02
Peak ID	CHOY
Year	2025
Season	3
First Name	Serge Robert Guy
Last Name	Kremer
Sex	M
Age	0
Birth Date	-
Year of Birth	1966
Calculated Age	58
Citizenship	UK
Status	Climber
Residence	-
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0957
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2437401
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	serge robert guy kremer
Year of Birth	1966
Year	2025
Age at Expedition	59
Role	Member

Field	Value
ID	26766
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	03
Peak ID	CHOY
Year	2025
Season	3
First Name	Nicole Elizabeth
Last Name	Ostertag
Sex	F
Age	0
Birth Date	-
Year of Birth	1990
Calculated Age	35
Citizenship	USA
Status	Climber
Residence	-
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0733
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2446016
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	nicole elizabeth ostertag
Year of Birth	1990
Year	2025
Age at Expedition	35
Role	Member

Field	Value
ID	26767
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	04
Peak ID	CHOY
Year	2025
Season	3
First Name	Denisa
Last Name	Ronzani
Sex	F
Age	0
Birth Date	-
Year of Birth	1974
Calculated Age	51
Citizenship	USA
Status	Climber
Residence	-
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0835
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2440153
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	denisa ronzani
Year of Birth	1974
Year	2025
Age at Expedition	51
Role	Member

Field	Value
ID	26768
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	05
Peak ID	CHOY
Year	2025
Season	3
First Name	Dawa Tenji
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1995
Calculated Age	30
Citizenship	Nepal
Status	H-A Worker
Residence	Yaphu-9, Makalu-Barun
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0816
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	3rd ascent of Cho Oyu
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2447692
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	dawa tenji sherpa
Year of Birth	1995
Year	2025
Age at Expedition	30
Role	Hired

Field	Value
ID	26769
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	06
Peak ID	CHOY
Year	2025
Season	3
First Name	Lhakpa Wangchu
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1986
Calculated Age	38
Citizenship	Nepal
Status	H-A Worker
Residence	Pangboche, Khumbu
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0834
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	3rd ascent of Cho Oyu, brother of Pasang Dawa (Pando)
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2444635
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	lhakpa wangchu sherpa
Year of Birth	1986
Year	2025
Age at Expedition	39
Role	Hired

Field	Value
ID	26770
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	07
Peak ID	CHOY
Year	2025
Season	3
First Name	Mingma Dorje
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1969
Calculated Age	56
Citizenship	Nepal
Status	H-A Worker
Residence	Sibuje, Waku-4, Solukhumbu
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0913
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2438295
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	mingma dorje sherpa
Year of Birth	1969
Year	2025
Age at Expedition	56
Role	Hired

Field	Value
ID	26771
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	08
Peak ID	CHOY
Year	2025
Season	3
First Name	Phura Chhetan (Fura Chhetan)
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1990
Calculated Age	35
Citizenship	Nepal
Status	H-A Worker
Residence	Phortse, Khumbu
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0733
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2446037
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	phura chhetan (fura chhetan) sherpa
Year of Birth	1990
Year	2025
Age at Expedition	35
Role	Hired

Field	Value
ID	26772
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	09
Peak ID	CHOY
Year	2025
Season	3
First Name	Temba
Last Name	Sherpa
Sex	M
Age	0
Birth Date	-
Year of Birth	1984
Calculated Age	40
Citizenship	Nepal
Status	H-A Worker
Residence	Bala-3, Makalu-Barun
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	True
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0957
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2443973
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	temba sherpa
Year of Birth	1984
Year	2025
Age at Expedition	41
Role	Hired

Field	Value
ID	26773
Imported	2026-11-04 22:32:24.749110
Expedition ID	CHOY25306
Member ID	10
Peak ID	CHOY
Year	2025
Season	3
First Name	Siddhi Bahadur
Last Name	Tamang
Sex	M
Age	0
Birth Date	-
Year of Birth	1981
Calculated Age	44
Citizenship	Nepal
Status	H-A Worker
Residence	Simigaon, Dolakha
Occupation	-
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	True
Sherpa	False
Tibetan	False
Summit Success	True
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	False
High Point (m)	True
Personal High Point (m)	8188
Summit Date 1	2025-10-13
Summit Date 2	-
Summit Date 3	-
Summit Time 1	0838
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	True
O2 None	False
O2 Climb	True
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	2nd ascent of Cho Oyu
Necrology	-
Summit Bid	5
Summit Term	1
HCN	0
Checksum	2442676
Summit Note 1	0
Summit Note 2	0
Summit Note 3	0
Death Route	0
Name (lowercase)	siddhi bahadur tamang
Year of Birth	1981
Year	2025
Age at Expedition	44
Role	Hired

10 recorded members.

Name	Sex	Year of Birth	Citizenship	Status	Residence	Occupation
Garrett Christian Madison	M	1978	USA	Leader	Seattle, Washington	Alpine guide	Details Other expeditions
Serge Robert Guy Kremer	M	1966	UK	Climber	-	-	Details Other expeditions
Nicole Elizabeth Ostertag	F	1990	USA	Climber	-	-	Details Other expeditions
Denisa Ronzani	F	1974	USA	Climber	-	-	Details Other expeditions
Dawa Tenji Sherpa	M	1995	Nepal	H-A Worker	Yaphu-9, Makalu-Barun	-	Details Other expeditions
Lhakpa Wangchu Sherpa	M	1986	Nepal	H-A Worker	Pangboche, Khumbu	-	Details Other expeditions
Mingma Dorje Sherpa	M	1969	Nepal	H-A Worker	Sibuje, Waku-4, Solukhumbu	-	Details Other expeditions
Phura Chhetan (Fura Chhetan) Sherpa	M	1990	Nepal	H-A Worker	Phortse, Khumbu	-	Details Other expeditions
Temba Sherpa	M	1984	Nepal	H-A Worker	Bala-3, Makalu-Barun	-	Details Other expeditions
Siddhi Bahadur Tamang	M	1981	Nepal	H-A Worker	Simigaon, Dolakha	-	Details Other expeditions

References

Field	Value
ID	3361
Imported	2026-11-04 22:32:27.711802
Expedition ID	CHOY25306
Reference ID	01
Year	2025
Type	5
Journal	-
Author	-
Title	https://madisonmountaineering.com/cat-dispatches/cho-oyu/cho-oyu-2025/
Publisher	-
Publication Date	-
Language	-
Citation	-
Yak 94	-
Notes	-

1 recorded references.

Expedition ID	Journal	Author	Title	Publisher	Citation	Yak 94
CHOY25306	-	-	https://madisonmountaineering.com/cat-dispatches/cho-oyu/cho-oyu-2025/	-	-	-