Rising popularity in mass timber construction for residential and commercial projects has escalated the need to develop and increase understanding of mass timber products both from a strength and serviceability perspective. For cross-laminated timber (CLT) there is a significant lack of research on the creep characteristics also known as long-term deflection behavior. Creep is particularly important for products such as CLT that are used for floors with longer spans. Full-scale creep testing was conducted using 5ply CLT panels over the course of 6 months in a controlled environment under dry service conditions. Testing resulted in average final deflections 1.73 times the initial elastic deflections. This data was fitted to a power model to provide an accurate estimation of a creep factor for CLT products used in designs under the NDS. Current models show an average increase in deflection of 1.95 times the initial instantaneous deflections after 2.5 years supporting a 2.0 creep factor (Kcr) for the prediction of longterm deflections in the design of CLT members according to the National Design Specification for Wood Construction.