The isomerization of cyclopropane has been studied in a flow reactor at 897 K and from 4 to 406 Torr. The pressure dependence of the rate constants from this work and from the literature have been compared with predictions obtained from two models based on the theory of Yau and Pritchard and from three RRKM models. The collisional deactivation efficiency was found to generally decline with increasing temperature. The average energy removed per collision was calculated by the method of Tardy and Rabinovitch and was found to have values from 15 to 23 kJ mol−1 at 897 K. Combining the results of this work with data from the literature from 690 to 1038 K, the limiting high pressure rate constants follow the relation log k∞ = 15.50 ± 0.14 – (276.0 ± 2.1 kJ mol−1)/2.3RT.