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Grass Wonder

Grass Wonder was an American-bred, Japanese-trained Thoroughbred racehorse and stallion.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Grass Wonder (18 February 1995 – 8 August 2025) was an American-bred Thoroughbred racehorse who was trained and raced in Japan. He was a top juvenile in 1997 and later won major Grade I races including consecutive Arima Kinen victories and the Takarazuka Kinen. He died at age 30 in 2025.

Racing career

Grass Wonder competed from 1997 to 2000 and won nine of his fifteen starts. He became one of the leading Japanese racehorses of his generation, with major wins at both two and three to four years old.

Stud career

After retirement from racing, Grass Wonder stood at stud in Japan beginning in 2001. His offspring included major winners such as Screen Hero and Earnestly, extending his influence in Japanese breeding.

Legacy

Grass Wonder is remembered as one of the prominent foreign-bred horses to succeed at the highest level in Japan. His career and image later helped inspire popular horse-racing media and character portrayals.

Key facts

  • Grass Wonder was born in Kentucky, United States, and raced in Japan.
  • He was unbeaten in four starts at age two and was named Japan's Best Two-Year-Old Colt in 1997.
  • He won the Asahi Hai Sansai Stakes in 1997.
  • He won the Arima Kinen in 1998 and 1999, and the Takarazuka Kinen in 1999.
  • He entered stud in Japan in 2001.

Frequently asked questions

What was Grass Wonder?
Grass Wonder was an American-bred Thoroughbred racehorse that was trained and raced in Japan.
What were his most important wins?
His major wins included the 1997 Asahi Hai Sansai Stakes, the 1998 and 1999 Arima Kinen, and the 1999 Takarazuka Kinen.
How successful was he as a racehorse?
He won 9 of 15 career starts and captured four Grade I races.
When did Grass Wonder become a stallion?
He entered stud in Japan in 2001.
Who were some of his notable offspring?
Notable progeny included Screen Hero, Earnestly, and Seiun Wonder.
When did Grass Wonder die?
He died on 8 August 2025 at the age of 30.

References

  1. JBIS — https://www.jbis.jp/horse/0000299089/
    Supports: Foaling date, pedigree, breeder and basic horse record.
  2. Japan Race Horse Association — https://www.jrha.or.jp/stallion_e/horse/?name=Grass_Wonder
    Supports: Major racing achievements, awards, stud entry and notable progeny.
  3. Wikipedia — https://en.wikipedia.org/wiki/Grass_Wonder
    Supports: Race record, birthplace, racing period and biographical overview.
  4. Idol Horse — https://idolhorse.com/horse-racing-news/world/kentucky-to-cult-hero-the-legend-of-grass-wonder/
    Supports: American birth, Kentucky foaling, sire and dam identification, and background.
  5. SoapCentral — https://www.soapcentral.com/pop-culture/news-who-grass-wonder-all-legendary-racehorse-dies-30
    Supports: Death date, age and brief biographical details.