OBJECTIVE To examine the relationship between training, anthropometric characteristics, tapering, and time performance for a half-Ironman distance race. METHODS Cross sectional study in triathletes. METHODS Data were obtained for 209 participants (155 males; 54 females) competing in a half-Ironman triathlon. Participants provided information regarding triathlon experience, training, race preparation, and tapering. Participants were divided into three groups based on finish time for analysis. RESULTS Males in the fastest group weighed less and had lower body fat percentage compared to males in the slower groups (p ≤ 0.01). Athletes in the fastest group had completed more half-Ironman races and took fewer rest days during training compared to athletes in the slower groups (p<0.01). The average time spent training was 13.9 ± 5.4 h per week, and this did not differ between groups. The faster group of athletes set lower race time goals (p<0.01) and placed greater importance on achieving goal time (p=0.04). Eighty-one percent reported performing a taper with a decrease in training volume of 58.5 ± 34.7% and a decrease in training intensity of 44.9 ± 40.8%. However, there were no differences in taper variables between the three groups. Age, previous best half-Ironman time, goal time, and goal importance predicted 58% of variance in finish time. CONCLUSIONS The fastest group of triathletes exhibited differences in anthropometrics, race experience, and goal-setting compared to slower athletes. There were no differences in total training hours or tapering between groups. The best predictors of race performance were age, previous best half-Ironman time, goal time, and importance of reaching this goal.