We performed 2 trials on sorting behavior in individually raised dairy calves (n = 18). For both, calves were provided free access to TMR [49.1 ± 1.5% DM (Mean ± SD); chemical composition shown as % of DM, CP 16.9 ± 0.95%, NDF 31.8 ± 2.68%, ADF 20.4 ± 1.77] and calf starter [with an overall DM of 89.5%; chemical composition shown as % of DM, CP 20.6 ± 1.13%, NDF 16.5 ± 0.39%, ADF 7.84 ± 0.45%] for the first 2 mo of life. Sorting was assessed at 65 d, when calves still had access to calf starter, and again at d70 when starter was no longer available. On each day, sorting was measured by comparing diets before feeding with orts after 24 h of feed access. Particle sizes were measured using the Penn State Particle Separator with 3 screens (19, 8, and 1.18 mm) and a bottom pan to separate the TMR into long, medium, short, and fine fractions respectively. The predicted intake of each particle size fraction in the orts was tested between treatment for a difference from 100 using t-tests. When able to access the calf starter, calves sorted the TMR selecting for long particles (133 ± 9%; P = 0.0038) and against small particles (92 ± 3%; P = 0.0240), with no differences for the remaining particle fractions (99 ± 5% [P = 0.90] for medium; 107 ± 5% [P = 0.14] for fine). When calves no longer had access to the starter these preferences reversed; calves preferentially selected the fine particles (113 ± 4%; P = 0.01), with no selection for the other fractions (101 ± 11% [P = 0.94] for long; 99 ± 6% [P = 0.80] for medium; 97 ± 4% [P = 0.51] for short). These results indicate that young dairy calves are capable of sorting TMR and adjust their sorting behavior in response to changes in feed offered.