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We present the calibration of the Dark Energy Survey Year 1 (DES Y1) weaklensing source galaxy redshift distributions from clustering measurements. Bycross-correlating the positions of source galaxies with luminous red galaxiesselected by the redMaGiC algorithm we measure the redshift distributions of thesource galaxies as placed into different tomographic bins. These measurementsconstrain any such shifts to an accuracy of $\sim0.02$ and can be computed evenwhen the clustering measurements do not span the full redshift range. Thehighest-redshift source bin is not constrained by the clustering measurementsbecause of the minimal redshift overlap with the redMaGiC galaxies. We compareour constraints with those obtained from $\texttt{COSMOS}$ 30-band photometryand find that our two very different methods produce consistent constraints.

Dark Energy Survey Year 1 Results: Cross-Correlation Redshifts in the DES -- Calibration of the Weak Lensing Source Redshift Distributions