Spoor measurements of seven subadult black rhinoceroses (Diceros bicornis L.) (three males and four females) were measured during a structured release programme in Matusadona National Park, Zimbabwe. These measurements were then used to test for a relationship between spoor width and length, with the age and weight of the subadult rhinoceroses. In many areas where rhinoceroses occur it is not always possible to obtain visual records, and the ability to accurately assess the age of subadults from spoor will greatly assist management with determining recruitment rates into rhinoceros populations. The efficacy of the immobilization of rhinoceroses in the field would be greatly improved if the weights of subadults were known prior to darting. The results of this study found significant relationships between the spoor measurements and both age and weight, with spoor length being the best predictor variable. There is a need to determine the effect of soil substrate on these relationships. Although the spoor measurements were taken from the same area of ground, suggesting a similar soil substrate throughout, the measurements were taken from both dry and wet soil, depending on the season. It was also found that as the subadults reached maturity, variability in their spoor measurements increased. The results suggest that measuring spoor of subadults in the field could be a valuable management tool for determining recruitment and assessing drug dosages.