2001
- Nov:
- Ooedo-Onsen Monogatari Co., Ltd. founded with the aim of operating onsen (hot spring) theme parks and bathing facilities
2003
- Mar:
- Odaiba Ooedo-Onsen Monogatari(Tokyo) opened as the first onsen theme park in Japan
2007
- Mar:
- Began operation of Ooedo-Onsen Monogatari Aizu (Fukushima)
- Apr:
- Began operation of Ooedo-Onsen Monogatari Ikaho (Gunma), Ooedo-Onsen Monogatari Kakeyu (Nagano), and Ooedo-Onsen Monogatari Nikko Kirifuri (Tochigi)
- Jul:
- Began operation of Ooedo-Onsen Monogatari Gero (Gifu)
- Nov:
- Began operation of Ooedo-Onsen Monogatari Kimitsu-no-mori (Chiba)
2008
- Mar:
- Began operation of Ooedo-Onsen Monogatari Kamoshika-so(Tochigi)
- Jul:
- Began operation of Ooedo-Onsen Monogatari Nagayama (Ishikawa)
- Dec:
- Began operation of Higashiyama Grand Hotel (Fukushima)
2009
- Apr:
- Began operation of Ooedo-Onsen Monogatari Urayasu Mangekyo (Chiba), and Yamashiro Onsen Yamashitaya (Ishikawa)
2010
- Feb:
- Began operation of Hotel New Shiobara (Tochigi), Kinugawa Kanko Hotel (Tochigi), and Ito Hotel New Okabe (Shizuoka)
- Apr:
- Began operation of Hotel Kinugawa Gyoen (Tochigi)
- Jul:
- Began operation of Ooedo-Onsen Monogatari Hotel Reoma no Mori (Kagawa), New Reoma World (Kagawa), and Ooedo-Onsen Monogatari Tenka-taihei-no-yu Sumpu Yume Hiroba (Shizuoka)
- Oct:
- Began operation of Hotel Sokan (Miyagi)
2011
- Aug:
- Began operation of Ooedo-Onsen Monogatari Kinosaki (Hyogo)
2012
- Feb:
- Began operation of Ooedo-Onsen Monogatari Awara (Fukui)
- Mar:
- Began operation of Ooedo-Onsen Monogatari Sendai Korona-no-yu (Miyagi)
- Apr:
- Began operation of Ooedo-Onsen Monogatari Atami (Shizuoka)
- Aug:
- Began operation of Ooedo-Onsen Monogatari Ise-shima (Mie)
- Dec:
- Began operation of Hotel Shinko (Yamanashi)
2013
- Jul:
- Began operation of Ooedo-Onsen Monogatari Minoh Kanko Hotel (Osaka) and Minoh Onsen Minoh Spa Garden (Osaka)
- Nov:
- Began operation of Ooedo-Onsen Monogatari Toi Marine Hotel (Shizuoka)
2015
- Mar:
- Bain Capital Partners LLC acquired Ooedo-Onsen Holdings
2016
- May:
- Began operation of Naruko-yu-no-sato Kouunkaku (Miyagi) and Shiki-no-yado Masuya (Miyagi)
- Aug:
- Began operation of Nagasaki Hotel Seifu (Nagasaki)
2017
- Apr:
- Began operation of Ooedo-Onsen Monogatari Hotel Suiyotei (Shizuoka)
- May:
- Closed operation of Ooedo-Onsen Monogatari Gero (Gifu)
- Jul:
- Began operation of Ooedo-Onsen Monogatari Beppu Seifu (Oita) and Ooedo-Onsen Monogatari Gero-Shinkan (Gifu)
- Nov:
- Ooedo-Onsen Monogatari Group Co., Ltd. succeeded to the business of operating hotels/ Ryokan/ bathing facilities from Ooedo-Onsen Monogatari Co., Ltd.
2018
- Apr:
- Began operation of Ooedo-Onsen Monogatari Nanki Kushimoto (Wakayama)
- Aug:
- Began operation of Ooedo-Onsen Monogatari Kisoji (Nagano)
- Sep:
- Ooedo Onsen Monogatari Hotels & Resorts Co., Ltd. acquired Ooedo-Onsen Monogatari Group Co., Ltd.
2019
- Apr:
- Began operation of Ooedo-Onsen Monogatari TAOYA Shima (Mie)
- May:
- Began operation of Saikaibashi Corazon Hotel (Nagasaki)
- Aug:
- Began operation of Amakusa Hotel Kameya (Kumamoto)
2020
- Jul:
- Began operation of Ooedo-Onsen Monogatari Senamionsen Shiomiso (Niigata)
- Aug:
- Closed operation of Ooedo-Onsen Monogatari Tenka-taihei-no-yu Sumpu Yume Hiroba (Shizuoka)
- Nov:
- Began operation of Ooedo-Onsen Monogatari Sendai Akiuonsen Iwanumaya (Miyagi)
2021
- Sep:
- Closed operation of Odaiba Ooedo-Onsen Monogatari (Tokyo)
2022
- Feb:
- Lone Star Global Acquisitions, Ltd acquired Ooedo Onsen Monogatari Group
2023
- Apr:
- Renovated Oedo Onsen Monogatari Nikko Kirifuri (Tochigi)
Began operation of TAOYA Nikko Kirifuri - Jun:
- Renovated Oedo Onsen Monogatari Shiomiso (Niigata) and Oedo Onsen Monogatari Gero Shinkan (Gifu)
as Oedo Onsen Monogatari Premium
Renovated Sendai Akiuonsen Iwanumaya (Miyagi)
Began operation of TAOYA Akiu - Jly:
- Renovated Oedo Onsen Monogatari Kinosaki (Hyogo)
as Oedo Onsen Monogatari Premium - Aug:
- Renovated Oedo Onsen Monogatari Saikaibashi Corazon Hotel (Nagasaki)
Began operation of TAOYA Saikaibashi
Renovated Oedo Onsen Monogatari Kamoshikaso (Tichigi)
Began operation of TAOYA Nasushiobara - Sep:
- Terminated contract operation of Sendai Korona-no-yu (Miyagi)