The study focuses on five-year old rubber trees planted at altitudes raging from 750 to 1,200 feet. They are observed to determine the influence of land elevation to their growth, morphology, yield potential, and the influence of altitude to the soil in air temperatures. Data show that stem girth and thickness of the soft bark significantly decrease in higher elevations with the slope having a much dryer soil. The number of laticifers is not affected but the diameter decreases significantly with the increase in elevation. The soil temperature is not affected but the air temperature progressively decreases by the increase in altitude.