A dynamic model was developed to predict survival of the most heat tolerant stage of the confused flour beetle, Tribolium confusum (Jacquelin du Val), exposed to elevated temperatures between 46 and 60ºC. The model is based on two nonlinear relationships: (1) logarithmic survival of T. confusum old larvae as a function of time, and (2) logarithmic reduction in survival as a function of temperature. The model was validated with nine separate data sets collected during actual facility heat treatments. The absolute deviation of the model was within 2-7% with respect to the number of larvae surviving the heat treatment, and within 2-6% with respect to time for equal larval survival at heating rates 1.12 to 13.24ºC/h. The dynamic model can be used to predict survival of old larvae of T. confusum during heat treatments of food processing facilities based on time-dependent temperature profile obtained at any given location.