Eighty black spruce (Picea mariana (Mill.) B.S.P.) trees from four pulpwood stands in north central Ontario were sampled to determine crown fuel weights. Crown fuel components, both living and dead, were separated into size classes precise enough for use in forest fire behavior research. Regression equations expressing various crown fuel components as a function of tree diameters at breast height (DBH) were derived, and the resulting R^2 values were between 0.75 and 0.84. Total crown biomass figures are presented herein for the four stands sampled. Approximately 80% of the total crown weight per hectare is made up of fuel particles less than or equal to 0.64 cm in diameter (including needle foliage). Live fuels make up approximately 74% of total crown weight per hectare.