Further analysis of the Gemini-North GMOS spectrum of the afterglow (Huang et al., GCN 10461) of GRB 100302A (Cummings et al., GCN 10458) described in GCN 10465 (Cucchiara et al.) reveals that the afterglow shows a sharp increase in continuum flux redward of 7100 Angs, with only a weak continuum detected between 5500 and 7000 Angs, consistent with absorption by H I at z~4.8. There are several narrow absorption features superposed on the noisy red continuum, consistent with N V, Si II, Si II*, and C II at a mean redshift of 4.813, which we identify as the redshift of this burst.