ABSTRACT A study was made of the physical-biological properties of the clingstone peach variety Babygold 5 using a variety of static and dynamic tests. Test methods and results are compared and show that the constant appli-cation rate Magness-Taylor test gave less variable and lower values than did the hand-held test, that a non-destructive vibration test could be used to establish the elastic modulus, that compression samples indicate peach flesh exhibits visco-elastic behavior and that the elastic modulus, yield stress, and internal damping can be determined. Results also indicate good linear correlations of firmness, stiffness, and strength with a cumulative degree-day-sunshine-hour index of maturity. Impact tests using a pendulum and accelerometers established peak decelerations and resulting bruise damage, and how these values change with an increase in maturity index.