Various methods and compositions are provided for identifying and/or selecting a soybean plant or soybean germplasm with one or more preferred or desired reproductive growth phenotypes. In certain embodiments, the method comprises detecting at least one allele of one or more marker locus within or linked to a QTL associated with days to initiation of flowering. In other embodiments, the method additionally comprises detecting at least one allele of one or more marker locus within or linked to a QTL associated with days to maturity. In further embodiments, the method comprises crossing a selected soybean plant with a recurrent soybean parent plant. Further provided herein are marker loci, marker alleles, primers, probes, and kits suitable for identifying and/or selecting soybean plants or soybean germplasms with one or more reproductive growth phenotypes.