This paper presents the derivation of the threshold shear strain to trigger liquefaction, \({\gamma}_{cl}\) of gravelly soils using the cyclic strain approach considering the critical roles of void ratio (through shear wave velocity) and grain size distribution (through the coefficient of uniformity). Four different shear wave velocity-based liquefaction resistance models are used to develop equations for \({\gamma}_{cl}\) . The similarities and differences in each of these models are identified. Existing liquefaction case histories of gravelly soils are used to demonstrate the accuracy and uncertainty of the cyclic strain-based models where grain size distributions are available. Uncertainty and future research directions have been identified to explore the liquefaction resistance of difficult-to-sample gravelly soils.