| 1891 |
- Masaru Inoue founded Koiwai Farm |
| 1898 |
- Hisaya Iwasaki succeeds to the farm.
- Livestock breeding was started.
- An
executive of Shimofusa Imperial Stock Farm was hired as farm management
executive.
- Afforestation project was started. |
| 1899 |
- 1908: Cowsheds were built in the Kamimaru area. |
| 1901 |
- Sire and dam of Holstein, Ayrshire and Brown Swiss were imported from
the Netherlands,England and Switzerland respectively. Rams and ewes of Shropshire
were imported from England. |
| 1902 |
-Sale of sour cream butter (fermented butter) was started.
- Horse breeding was started. |
| 1903 |
- Old head office building was constructed. |
| 1904 |
- Horse tramway was built inside the farm. |
| 1905 |
- gNatural refrigeratorh was built. |
| 1907 |
- Thoroughbred breeders were imported from England.
- Brick silo was built |
| 1909 |
- approximately 1,000 hectares of afforestation was achieved. |
| 1916 |
- Four-story Granary was built. |
| 1933 |
- Kabutoyama became the Japan derby race champion from Koiwai Farm. |
| 1938 |
- KOIWAI FARM, LTD. was founded. |
| 1941 |
- A race horse, St. Light, became the first triple-crown winner from Koiwai
Farm. |
| 1948 |
- Koganei Farm was founded. (Moved to Sayama in Saitama Prefecture as Tokyo
Factory in 1966) |
| 1949 |
- Horse breeding was terminated. |
| 1950 |
- 1,039 chobu (approximately 1,000 hectares) of farm land was given up
by this year. |
| 1958 |
- Operation of the horse tramway was terminated. |
| 1962 |
- Poultry breeding was started. |
| 1965 |
- Koiwai Nosan Ltd. was established. |
| 1967 |
- Tourism business was started. |
| 1972 |
- Landscape engineering division started. |
| 1976 |
- Dairy production section was separated, and Koiwai Dairy Products Co.,
Ltd. was established as a merged company with Kirin Brewery Co., Ltd. |
| 1977 |
- Koiwai Farm Service Company, LTD. was established with 100% investment
from KOIWAI FARM, LTD. |
| 1978 |
- Koiwai Factory of Koiwai Dairy Products was founded within the farm premise. |
| 1980 |
-Technical Research Center was founded. |
| 1992 |
- Tsurugadai Dairy Barns was built. |
| 1993 |
- The park of the Tourism Department was established as Koiwai Farm Makiba-en.
- Makiba no Tenmon-kan (astronomical facility) opened. |
| 1995 |
- Iwate Moku Art K.K. (Donguri Korokoro) was founded in cooperation with
Iwate Forestry Association, etc.
- Human resource business was started at Koiwai Nosan, Ltd. |
| 1996 |
- Nine buildings on the farm were designated as national tangible cultural
properties. |
| 1998 |
- Sales of Koiwai Farm Eggs started.
- Sales of farm products fully started. |
| 2001 |
- ISO14001 certificate was acquired.
- Cake and bread factory of Koiwai Farm Service Company, LTD. was
built within the farm premise. |
| 2002 |
- ISO 9001 certificate was acquired. (Environmental Restration and Landscape
Engineering Division)
- Koiwai Freminar (restaurant) opened at Marunouchi Building in Tokyo |
| 2003 |
- Arboretum was opened. |
