Cone Penetration Test (CPT) based simplified liquefaction evaluation procedures offer significant advantages over variants based on alternative in-situ test indices. However, the main drawback of CPT-based variants is that soil samples are typically not recovered during CPT sounding, and as a result, soils are often not characterized directly or tested further in the laboratory. The need thus arises to infer soil properties from CPT indices without physical confirmation. Utilizing an unprecedented database of field and laboratory test data from Christchurch, New Zealand, this study proposes deterministic and probabilistic correlations relating the soil behavior type index (Ic) to liquefaction susceptibility as defined by published criteria. The findings show that Ic can be used with reasonable accuracy as a proxy for laboratory index-test based criteria for assessing liquefaction susceptibility. Additionally, to assess liquefaction hazards in a fully probabilistic manner, the uncertainty of Ic for defining liquefaction susceptibility can be accounted for using an approach similar to that used to create fragility functions for performance-based earthquake engineering. The approaches used herein to develop deterministic and probabilistic Ic relationships for liquefaction susceptibility are not limited to soils from New Zealand, but rather, can be applied worldwide.