The southeastern United States contains a multi-billion dollar pine timber industry that could be affected significantly by the establishment and spread and of Sirex noctilio F. (Hymenoptera: Siricidae), the non-native wood wasp that was discovered recently in the northeastern United States. Several factors, including the timing of native wood wasp (S. nigricornis F.) emergence and flight, may influence the success of S. noctilio. Understanding the seasonal phenology of the native wood wasp will allow us to make better predictions regarding the potential ecological impacts by S. noctilio on Arkansas pine forests. Native S. nigricornis females were collected across 3 geographic regions of Arkansas from 2009 to 2013 using intercept panel traps baited with Sirex lure (70/30-α/β-pinene blend) and ethanol. A Gompertz 3-parameter model was fitted to each year of trapping as well as a final dataset containing all trapping seasons. Emergence rates and inflection points of the models did not differ among geographic regions within any year but did change significantly among years. In regions where both wood wasps occur, native wood wasps emerge in the fall and attack dead pines, whereas S. noctilio emerges much earlier and attacks live, standing trees. We expect these patterns to remain very similar upon the spread of S. noctilio into the Southeast. Therefore, we do not expect these 2 species to utilize the same hosts or emerge at the same time in Arkansas, which makes native species displacement unlikely. Additional studies examining the effects of predators, parasitoids, and competitors on Sirex population dynamics would greatly enhance these predictions.