This dataset presents zircon 238U-230Th disequilibrium dates from multiple tephra samples from the Atitlán caldera in Guatemala, Central America. Zircon 238U-230Th isotope compositions were obtained using secondary ion mass spectrometry (SIMS) at Heidelberg University, Germany. Dates were calculated using the isochron method and new bulk-rock U-series data presented in Table S2.

Analytical Uncertainties are 1σ. ∞ = zircon in secular equilibrium (˃350 ka) m = zircon-melt model isochron slope; (238U)/(232Th) = 0.983 ± 0.009 and (230Th)/(232Th) = 1.072 ± 0.026 from this study.Decay constants used: λ232: 4.9475·10−11 a−1; λ230: 9.1705·10−6 a−1; λ238: 1.55125·10−10 a−1.Secular equilibrium zircon reference AS3 (230Th)/(238U)= 1.001 ± 0.006 (MSWD = 0.56; n= 19) for session where new samples were analyzed (G13-87, PET-06, M6613-229, M18-1).U concentration from measured 238UO+/90Zr2O4+ relative to 91500 zircon with 81.2 ppm U.