Climate influenced the distribution of major animal groups that emerged during the Triassic period throughout the supercontinent Pangea. The earliest dinosaurs and associated assemblages (Carnian Stage, Late Triassic, ~230 Ma) are recovered along a paleolatitudinal climate belt spanning southern Pangea. However, developmental responses of different amniotic clades to climate across these environments remain unknown. Thus, characterizing developmental variability, presumably driven by climatic variability within this belt, will help constrain the climatic ranges of the first dinosaurs, prior to their worldwide dispersal. Here, we describe the bone histology of five vertebrate taxa from the Carnian of Zimbabwe, including sauropodomorph and herrerasaurid dinosaurs, a gomphodontosuchine cynodont, a hyperodapedontine rhynchosaur, and a suchian archosaur (?aetosaur) to compare various growth strategies/metabolisms in the same environment. The dinosaurs exhibit well-vascularized cortical bone and no apparent growth marks, suggestive of continuously growing individuals. The cynodont femur has a well-vascularized fibrolamellar matrix with anastomosing vascular canals throughout the cortex and a single growth mark, indicating rapid growth. The rhynchosaurian femur and suchian tibia show moderate to poorly vascular bone matrix, possessing multiple lines of arrested growth and an external fundamental system, suggesting these were slow-growing individuals that had reached skeletal maturity at the time of death. Comparing this histology to that of similar assemblages from current-day Brazil, Argentina, and India (which fell along the same paleolatitudinal zone during the Triassic), the mid-continent (i.e., Zimbabwean) dinosaurs exhibit more continuous growth than dinosaurs from other localities along this climatic belt, whereas the Zimbabwean rhynchosaur and suchian exhibit slower growth patterns with more frequent cessation of growth than their South American counterparts. The slower-growing Zimbabwean taxa—presumably, more susceptible to climatic stressors—exhibit characteristics suggestive of a harsher environment (e.g., slower growth, frequent cessation) compared with rhynchosaurs and aetosaurs from South America. However, the taxa with faster growth rates and higher metabolic regimes (i.e., dinosaurs, cynodonts) from this same assemblage apparently grew rapidly—and roughly continuously—throughout the year. This is consistent with an overall harsher but less seasonal climate in Zimbabwe compared to the signals recovered in Brazil, Argentina, and India.