As climate change increases temperature, Pieris rapae caterpillars' feeding habits may be affected. As their feeding habits are altered, P. rapae may begin to migrate to different plants; this can be detrimental for agriculture because these defoliating caterpillars are pests. P. rapae caterpillars are known to feed on Brassica species, including collards and kale. It is also shown that caterpillars increase their feeding rate at higher temperatures (Kingsolver 2000). However, little is known about how temperature influences their feeding preferences. In this experiment, we find the consumption rate of P. rapae 4th instar larvae eating kale (Brassica oleracea var. sabellica) and collards (Brassica oleracea var. viridis) to find consumption preference between these two plants at 14°C, 23°C, and 35°C. Larvae were placed on a moist filter paper in petri dishes containing 2 collard and 2 kale leaf disks placed in an alternating fashion. Petri dishes were placed in three separate incubators set to the three temperatures. We predicted that P. rapae would have a preference for collards since they are reared on collards in the lab and they would increase their consumption of the preferred plant. We also examined the percentage per hour of each leaf eaten and compared this data between types of leaves and temperatures. The data showed that as temperatures increased, the consumption rate of P. rapae caterpillars also increased. Though, there was no change in preference as the P. rapae caterpillars consistently preferred collards over kale. This suggest that higher temperatures from climate change will increase the rate at which caterpillars eat, but will not affect preference. It is important to consider the change in consumption rate of caterpillars with temperature when aiming to prevent crop damage in the face of climate change.