Grass Wonder, the legendary racehorse who inspired the beloved character in the Umamusume: Pretty Derby franchise, has passed away at the age of 30. This news was officially announced on August 8, 2025, by Big Red Farm, the Hokkaido stable known for housing many retired Japanese racehorses, including Grass Wonder. The stable confirmed that Grass Wonder died of multiple organ failure due to declining physical strength associated with aging. Having lived to 30, he enjoyed a remarkably long life compared to average racehorses.
Key Points Summary
- Grass Wonder was a Japanese Thoroughbred racehorse born on February 18, 1995, bred in the United States and raised in Japan.
- He had an illustrious racing career from 1997 to 2000, winning 9 of 15 races, including four Grade I events.
- Major wins included the 1997 Asahi Hai Sansai Stakes, back-to-back Arima Kinen races in 1997 and 1998, and the 1999 Takarazuka Kinen.
- The horse inspired a character of the same name in the popular Japanese media franchise Umamusume: Pretty Derby.
- Grass Wonder’s character is admired for her nobility, determination, and love of Japanese culture, reflecting the real horse’s legacy.
- The real Grass Wonder’s passing marks the end of an era for fans of both horse racing and the Umamusume series.
Grass Wonder was hailed as a distinguished competitor, revered for his strength and grace on the racetrack. His successes brought him acclaim, including notable victories in prestigious Grade I races, such as the iconic Arima Kinen which he won consecutively. His career record stands at 9 wins from 15 starts, a testament to his enduring talent and competitive spirit.
His legacy extended beyond the racetrack into pop culture as an inspiration for the character Grass Wonder in Umamusume: Pretty Derby, a franchise that anthropomorphizes champion racehorses into young, spirited girls who compete in horse racing-themed events. The Umamusume character is characterized by a refined and determined personality, carrying the spirit of the real horse through her narrative and design. She is portrayed as noble and gallant, a reflection of the horse’s esteemed reputation.
The announcement from Big Red Farm recounted that Grass Wonder was in good health earlier this year but his condition worsened swiftly before his passing. The stable expressed deep condolences and gratitude for the horse’s immense contributions to Japanese horse racing.
Grass Wonder’s pedigree included sire Silver Hawk and dam Ameriflora, and his ownership and training under notable figures ensured he competed at the highest levels of the sport. His impressive career earnings and numerous accolades underline the significant mark he left in racing history.
Fans of both racehorse sport and Umamusume have expressed their sorrow and appreciation online, honoring the memory of this remarkable horse. Grass Wonder’s impact resonates with racing enthusiasts and pop culture followers alike, symbolizing excellence and dedication.
As we remember Grass Wonder, may his legacy inspire both competitive spirit and admiration of beauty and strength in all who learn of his story. Feel free to share your memories or thoughts about this iconic racehorse and Umamusume character. Stay tuned for more updates from the world of horse racing and anime inspirations.