In contemporary history urban areas have expanded and created a suite of novel environmental conditions for organisms living within cities. With characteristics such as increased temperatures, urban environments have garnered interest from ecologists and evolutionary biologists aiming to understand the current effects of urban pressures and use urban populations to forecast how organisms might adapt to warmed conditions. Recently, many studies have documented urban-driven changes to morphological and physiological traits. Here, we explore the effects of urbanization on two morphological traits, body size and coloration, in butterfly populations. We used cabbage white butterflies (Pieris rapae), a cosmopolitan butterfly found in abundance in both urban and non-urban environments. The melanic wing pattern of P. rapae is plastic in regards to environmental temperature, with individuals reared at warmer temperatures exhibiting lighter coloration. While these patterns have been observed seasonally, there is no evidence to whether butterflies in urban areas have decreased coloration compared to their non-urban conspecifics. Using field-caught and lab-raised individuals we evaluate differences in coloration and body size and find sex-specific patterns in trait divergences.