We have conducted synchrotron x-ray diffraction studies on high purity zirconium metal at pressures $\left(P\right)$ up to $17\mathrm{GPa}$ and temperatures $\left(T\right)$ up to $973\mathrm{K}$. Unit cell volumes $\left(V\right)$ were derived from the refinements of x-ray diffraction data for the $\alpha$, $\beta$, and $\omega$ phases of zirconium and fitted to a Birch-Murnaghan equation of state with the pressure derivative of the bulk modulus, $K_0{}^{\prime }$, fixed at 4.0. The derived thermoelastic parameters for $\alpha$ zirconium are isothermal bulk modulus $K_0=92\left(3\right)\mathrm{GPa}$, temperature derivative of bulk modulus ${(\partial K∕\partial T)}_P=-2.3\left(8\right)\times {10}^{-2}\mathrm{GPa}∕\mathrm{K}$, volumetric thermal expansivity ${\alpha }_T=a+bT$ with $a=1.5(\pm 0.8)\times {10}^{-5}{\mathrm{K}}^{-1}$ and $b=1.7(\pm 1.4)\times {10}^{-8}{\mathrm{K}}^{-2}$, and the pressure derivative of thermal expansion ${(\partial \alpha ∕\partial P)}_T=-2.7\left(9\right)\times {10}^{-6}{\mathrm{GPa}}^{-1}{\mathrm{K}}^{-1}$. For the $\beta$ phase we obtained an isothermal bulk modulus of $K_T=66\left(3\right)\mathrm{GPa}$ at $973\mathrm{K}$ and a unit-cell volume of $V\left(973\mathrm{K}\right)=47.7\left(3\right){\mathrm{\AA }}^3$ at ambient pressure. For the $\omega$ zirconium we obtained $K_0=90\left(5\right)\mathrm{GPa}$. Within the experimental errors, the $K_0$ values we determined for the $\alpha$ and $\omega$ phases and volumetric thermal expansion for the $\alpha$ phase are in agreement with previous experimental results, whereas all other thermoelastic parameters represent the first determinations for the three crystalline phases of zirconium metal.