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)
2024
- Apr：
-
Renovated Oedo Onsen Monogatari Hotel Kisoji (Nagano)
Began operation of TAOYA Kisoji
Renovated Oedo Onsen Monogatari Yamashitaya (Ishikawa)
as Oedo Onsen Monogatari Premium - Jun：
-
Closed operation of Ooedo Onsen Monogatari Urayasu Mangekyo (Chiba)
Renovated Ooedo Onsen Monogatari Iseshima (Mie)
as Ooedo Onsen Monogatari Premium - Jly：
-
Renovated Ooedo Onsen Monogatari Hotel Sokan (Miyagi)
as Ooedo Onsen Monogatari Premium
Renovated Ooedo Onsen Monogatari Kinugawa Kanko Hotel (Tochigi)
as Ooedo Onsen Monogatari Premium
Renovated Ooedo Onsen Monogatari Atami (Shizuoka)
as Ooedo Onsen Monogatari Premium