We report measurements of the temperature- and species-dependent cross sections for the quenching of fluorescence from the B (1)Sigma(+)(v=0) state of CO. Cross sections were measured for gas temperatures ranging from 293 K to 1031 K for quenching by H-2, N-2, O-2, CO, H2O, CO2, CH4, He, Ne, Ar, Kr, and Xe. The CO B (1)Sigma(+)(v=0) state was populated via two-photon excitation (B (1)Sigma(+)<--<--X (1)Sigma(+)), and the B (1)Sigma(+)-->A (1)Pi fluorescence was collected. Quenching cross sections were determined from the dependence of the fluorescence-decay rate on quencher-gas pressure. The temperature dependence of the cross sections is well described by a power law for all but the two weakest quenchers, He and Ne.