Poor stall comfort impairs lying behavior and leads to injuries. Stall bed comfort is affected by the amount of longitudinal space, defined by the front restriction of the stall (manger wall) and the stall length, and bedding depth. This project aimed to maximize cow comfort by investigating the combined effect of 3 aspects of the stall bed: stall length, manger wall height, and bedding depth. Two rows of 12 tie-stalls were modified. Each row was a different length: short (178 cm; length commonly found in Quebec) or long (188 cm). Two manger wall treatments were applied randomly to the stalls in each row: high (20 cm, upper limit recommended) or low (5 cm). A 7.6 cm deep straw bedding layer was maintained by a bedding guard. Cows were randomly divided into 4 groups (n = 6/group), blocked by parity (2.7 ± 0.32) and DIM (115 ± 13.2 d). Two groups were assigned to each row and subjected to both manger wall treatments in a crossover design (1 wk habituation, 6 wk data collection/treatment). Lying behaviors were recorded continuously via leg-mounted accelerometers. Hock injury was scored 1x/wk and analyzed as a difference from baseline for each period. Data were analyzed using a mixed model with length, sequence, block, treatment, and period as fixed effects, week as a repeated measure, and cow as a random effect. Cows in long stalls were found to spend more time lying (848.5 vs. 797.9 min/d; P < 0.05) and had longer lying bouts than cows in short stalls (74.1 vs. 52.9 min/bout; P < 0.05). Improvement in hock injury was observed from wk 1 to 6 for all treatments (P ≤ 0.001, lateral tarsal; P ≤ 0.01, lateral calcanei). Manger wall height did not affect injury or lying time. Higher lying times in our study were comparable to those reported in deep-bedded loose-pens, indicating that cows with more bedding, especially those in long stalls, were more comfortable. Deep-bedded straw stalls with bedding guards are applicable on tie-stall farms and result in cows that are more comfortable, spend more time lying, and have fewer leg injuries.