Aboveground biomass and tree density data are presented for three spruce–lichen woodland and three spruce–moss forest sites (Piceamariana dominant). Based on regressions of oven-dry weight on diameter breast height, spruce biomass values of 10 000–29 000 and 78 000–163 300 kg•ha−1 were obtained from the woodland and forest sites, respectively. Tree densities ranged from 1270 to 3080 and 4840 to 5350 per hectare for the two associations.