Given the current high early marriage prevalence rate and corresponding high levels of socioeconomic and health problems, a detailed understanding of the dynamics of early age at first marriage is indispensable. The assessed the spatiotemporal dimensions of first nuptial age across gender in Homa Bay County, Kenya. The study employed a cross sectional research design to collect retrospective and present status data. Primary data were directly collected using structured questionnaires and in-depth interviews in line with the objective of the study. The sample constituted of 420 household heads between 20-49 years. Inferential statistics including the Logistic Regression, Kaplan Meier Survival Analysis and Quantum GIS were used to analyze quantitative data. Of all the 420 household heads, 106(48.6%) of women and 17(8.3%) of men married early. Geographical region had no substantial influence on age of first marriage, possibly because all the sub-counties are culturally homogeneous in the marriage patterns. Men and women who never courted before marriage, lacked gainful premarital labor and lived in rural areas during their childhood increased the odds of early marriages. Early onset of marriage was also attributed to the lower age at sexual debut and ex-nuptial birth among women. Important factors such as premarital contraceptive use and migration status were found to be significant predictors of age at first marriage among men. It is thus recommended that an integrated strategy framework through structural improvements, accessibility of alternative opportunities for adolescents, and creating an enabling environment that empowers adolescents be adopted to change the significant drivers of early marriages.