The lenition of Spanish intervocalic voiced stops, commonly grouped as /bdg/, has increasingly been examined within Spanish as a Heritage Language research. This study seeks to identify social, phonetic, and lexical factors that predict the degree of lenition of /bdg/ among heritage speakers of Spanish. We analyzed 850 intervocalic productions of /bdg/ by 20 adult Spanish heritage speakers of various generations in an oral word list production task. Using spectrographic analyses, productions were categorized as full approximant, tense approximant, and occlusive. Results from linear mixed-effects models indicated that the phonetic context and the number of family generations residing in the US significantly predicted the degree of lenition of intervocalic voiced segments while age of acquisition of Spanish, current contact hours, and cognate status did not predict changes in the degree of lenition. Specifically, as the speaker’s number of family generations residing in the US increased, fewer segments were lenited. We conclude that variations in /bdg/ lenition among heritage speakers of Spanish reflect the changes in pronunciation of other segments of heritage speakers over generations.