The solubility of sodium dodecyl sulfate (SDS) in water at temperatures between (270.5 and 281.3) K near propaneand carbon dioxide hydrate-forming conditions was determined by directly sampling the SDS solution from ahigh-pressure reactor. The SDS solubility near propane or carbon dioxide hydrate-forming conditions is identicalto that at ambient conditions. The results indicate that the Krafft point for SDS does not shift to a temperaturebelow 281 K even in the presence of high-pressure propane or carbon dioxide.