Data and R code to accompany the manuscript "Improving growth models of cultivated sugar kelp (Saccharina latissima) by accounting for intraspecific variation in thermal tolerance" (Krasnow et al., 2024), published in the Journal of the World Aquaculture Society. Some material was originally created by Celeste Venolia in March 2018-December 2019 for Venolia et al. (2020). cold_validation.R contains the code to validate DEB kelp model against data from Trømso, Norway venolia_validation.R contains the code to validate the model against the data from Rhode Island, USA, reproducing the analysis from the original paper and producing new estimates with the newly-estimated temperature parameters SolveR_R.R includes the function that is used to solve for the specific growth rate (r) KelpDEB_model.R includes the deSolve-structured function used to run the model Please use the most recent version (3.1) so that all data/code needed to run the analyses are present.