Background: Although external game loads have been readily examined across acute timeframes within male rugby league seasons, longitudinal analysis between seasons remain limited. Consequently, this study compared game demands during separate seasons in male, rugby league players. Methods: One semi-professional team competing in a men’s state-level Australian rugby league competition was monitored during all games for three seasons (2022–2024). External load variables were measured with global positioning system devices. Linear mixed-model and Hedge’s gav effect sizes were used to compare variables between seasons within the same players (participated in all seasons, n = 6) and within the entire team (participated in any season, n = 33). Results: Within-player and team-level analyses revealed playing duration (p < 0.01, gav (range) = 0.44–0.63), total distance (p < 0.05, gav = 0.33–0.51) and peak speed (p < 0.01, gav = 0.35–0.52) were significantly lower, while relative (per min) distance (p < 0.05, gav = 0.35–0.52), accelerations (p < 0.01, gav = 0.57–0.69) and decelerations (p < 0.01, gav = 0.47–0.60) were significantly higher in 2022 compared to other seasons. Non-significant differences were evident between 2023 and 2024 for all variables (p > 0.05, gav = 0.03–0.23), except relative high-speed running distance, which was higher in 2024 in team-level analyses (p = 0.01, gav = 0.31). Conclusions: The increased playing duration, total distance and peak speed, and decreased relative external load variables in 2023–2024 compared to 2022 were mostly small in magnitude, indicating seasonal fluctuations were relatively subtle at player and team levels. These findings suggest practitioners working with semi-professional, male rugby league players could develop long-term plans for upcoming seasons based on typical game data from previous seasons, but plans should be adaptable given the inconsistent and tenuous way loads may vary longitudinally.