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In this article we study solutions to the (interior) thin obstacle problemunder low regularity assumptions on the coefficients, the obstacle and theunderlying manifold. Combining the linearization method of Andersson\cite{An16} and the epiperimetric inequality from \cite{FS16}, \cite{GPSVG15},we prove the optimal $C^{1,\min\{\alpha,1/2\}}$ regularity of solutions in thepresence of $C^{0,\alpha}$ coefficients $a^{ij}$ and $C^{1,\alpha}$ obstacles$\phi$. Moreover we investigate the regularity of the regular free boundary andshow that it has the structure of a $C^{1,\gamma}$ manifold for some $\gamma\in (0,1)$.

Optimal Regularity for the Thin Obstacle Problem with $C^{0,\alpha}$ Coefficients