Nimmerdor, who died in 2003 at the age of 31, was named "stallion of the 20th century" by the Netherlands in 2000.
In his breeding career, Nimmerdor sired many highly predicated offspring, 18 approved sons, and 37 approved grandsons, including Goodtimes, Daimler, N-Aldato, Zadock, Nandor, Fortuna, Coronel, Amethist, Nimrod B, Norman, and Night and Day. Nimmerdor is ranked 32 on the 2019 90% confidence rating KWPN breeding values, an evaluation system that looks at sport performance, conformation, movement and health. From 1992-2001, Nimmerdor offspring included 42 international jumpers, contributing to his 29th place for that period in the World Breeding Federation Sport Horse rankings. In total, Nimmerdor produced over 100 international show jumpers and dressage horses. Nimmerdor is 10th on the July 2019 list of KWPN approved stallions who have produced the most 1.60m and 1.55m Grand Prix jumpers.
Nimmerdor's most famous son, Heartbreaker, is the father of his own dynasty, and Nimmerdor's grandsons include Hickstead, the 2008 Olympic gold medallist famously owned and ridden by Canadian Eric Lamaze, and De Sijem, the 2000 Olympic gold medallist from the Netherlands.
Nimmerdor was by the Holsteiner stallion Farn, one of the "founding sires" of Dutch sport horses, and the only foal out of thoroughbred 1.20 m jumper Ramonaa. Ramonaa was by Senator, the son of another famous mare, Morgenster.