Wood specific gravity was determined for 29 half-sib families of 4-year-old Pinus tecunumanii from the Mountain Pine Ridge, Belize, planted at three locations in Brazil and Colombia. Although there was a significant (p ≤ 0.05) family by sites interaction (F × S), it was found that only 5 of the 29 families were major contributors. The test planting at the highest elevation (1750 m, La Arcadia, Colombia) was the most interactive site.