These data and code accompany the paper: "Over the limit: Consequences of gray squirrel personality on the shifting range limits of oak and hickory species". By Margaret R. Merz, Francesca Colombini, and Alessio Mortelliti. These data can be used to replicate all main analyses in the paper. These data are not intended for use in other publications. Please contact the authors if you would like to collaborate on a project using these data. If additional comments or questions arise, please contact the corresponding author at margaret.r.merz@gmail.com.