The research work was carried out in order to assess diameter growth and mortality of six classes of Eucalyptus camaldulensis stands in Afaka Forest Reserve, Kaduna, Nigeria. Stratified random sampling and proportional sample allocation were employed for the research. Live and dead trees were counted and recorded, diameter of the live and dead trees was measured using flexible tape, tree heights were measured with Hagar altimeter (in meter), planting spacing and age of each stand weredetermined. The result of the research revealed that, mortality was extremely high at the early stage of stand development with mortality rates of the lower Dbh and height classes recording 98.91% and 98.76% of the mortality rate respectively. Three Dbh classes (14-16, 17-19 and 20-22cm) and three height classes (21-25, 26-30 and above 30 m) recorded no mortality. The positive regression coefficients (16.737, 49.266 and 1.992) showed by Dbh, Height and age (as independent variables) indicated positive future mortality effects on the stands; as the trees ages and increases in size and height, the chances of mortality will increase. At the present age and sizes of the stands the fitted model shows no significant relationship between the current age, height and size of the stands, as such the notion held by the management of the plantation that Eucalyptus cannot grow for many years and in large sizes is not true. There is therefore, need for periodic re-measurement of the stands to evaluate future effect of the variables (Age, Dbh and height) on mortality.