We report the rf performance of a single-cell superconducting radiofrequency cavity after low temperature baking in a nitrogen environment. A significant increase in quality factor has been observed when the cavity was heat treated in the temperature range of 120-160 °C with a nitrogen partial pressure of ~25 mTorr. This increase in quality factor as well as the Q-rise phenomenon ("anti-Q-slope") is similar to those previously obtained with high temperature nitrogen doping as well as titanium doping. In this study, a cavity N 2 -treated at 120 °C and at140 °C, showed no degradation in accelerating gradient, however the accelerating gradient was degraded by ~25% with a 160 °C N 2 treatment. Sample coupons treated in the same conditions as the cavity were analyzed by scanning electron microscope, x-ray photoelectron spectroscopy and secondary ion mass spectroscopy revealed a complex surface composition of Nb 2 O 5 , NbO and NbN (1-x) O x within the rf penetration depth. Furthermore, magnetization measurements showed no significant change on bulk superconducting properties.