Integral fission rates were measured for 232Th, 233U, 235U, 236U, 238U, 237Np, 239Pu, 248Pu, 241Pu, 241Am, 232mAm, and 243Am in four tailored epicadmium neutron spectra. The fission rates were determined by counting fission fragment tracks in solid-state track recorders. The measured and calculated fission rates differed by <7% for 232Th, 233U, 238U, 236U, and 237Np in each spectrum. There is evidence that the 232Th, 238U, and 237Np differential data need slight normalization corrections. Plutonium-239, 240Pu, 241 Pu, 241 Am, 242mAm, and 243Am each exhibited larger deviations of measured from calculated activities than the lighter nuclides. The magnitude of the deviations varied from one spectrum to another for some materials, indicating the possibility of not only magnitude but also shape uncertain-ties for the differential cross sections.