The potato crop (Solanum tuberosum L.) is affected by hemipteran insect pests including Circulifer tenellus Baker, Lygus spp., Myzus persicae Sulzer, and Macrosiphum euphorbiae Thomas. These pests can cause direct foliage damage or vector plant pathogens, and consequently reduce yield. Hence, the seasonal population dynamics of these four pests were monitored weekly from 2006 to 2019 in commercial potato fields located in the lower Columbia Basin of Oregon (USA). Using a multi-year dataset, we developed phenology models of each pest based on the accumulated degree-days (DD) and potato days (PD). The results presented here will help in improving hemipteran potato pests’ management.