We measured the natural frequency of vibration in 5 wood specimens of Pinus radiata D. Don (1 inch thickness) in the range of temperature from 10 degrees C to 100 degrees C at intervals of 10 degrees C. The samples were placed as a simple-beam and the vibration was induced by a quick shot. The signal of vibration was digitized and stored on a personal computer at a frequency acquisition of 1 kHz. At the beginning of the experiment the specimens were at 12% moisture content and were wrapped in a nylon film to minimize changes in moisture content. The temperature scan was conducted in a drying kiln with automatic control of temperature and relative humidity. According to theory, results show that wood loses stiffness gradually. This is expressed experimentally as a decrease in the frequency of vibration. Results show that at 100 degrees C the modulus of elasticity reduces close to 20% of its value at room temperature.