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One of the challenges for cattle management under extensive grazing systems is understanding how time spent in different individual activities is affected by factors like microclimate and forage quality and availability. The goal of this study is to understand how different tree densities and grazing management can influence the daytime behaviour of Nellore heifers (Bos indicus) kept in silvopastoral systems over a period of 12 months, covering one dry and one rainy season in Central Brazil. Eighty heifers were distributed between three silvopastoral systems with 357, 227 and 5 trees/ha, respectively, each divided into four 1.5 ha paddocks, grazing Piata grass with low (27 ± 4.6 cm) or high (39 ± 5.8 cm) sward heights, and with constant microclimate monitoring. Temperatures recorded were similar between seasons, characterizing an atypical dry period. The use of shade for grazing occurs preferably in the afternoon (72.0 min) and rumination in the morning (47.5 min). The effect of period of the day (P