We have shown that single NP mass spectrometry can be used to measure kinetics for surface reactions of individual NPs at temperatures limited primarily by the stability of the NP material. For Hf, the upper T NP limit is ~2400 K, due to fast sublimation and fragmentation at higher temperatures, but for more refractory materials (e.g. HfC) it is reasonably straightforward to approach 3000 K for a trapped NP.