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Argon matrices at 4K containing laser-vaporized zirconium metal were studied via electron spin resonance spectroscopy Signals exhibiting $\mathrm{<mrow\; data-mjx-texclass="ORD">91</mrow>}Zr(I=5/2)$ hyperfine structure were assigned to a $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma$ ground state of the $ZrO+$ molecule. This assignment is consistent with the $X2\Sigma$ ground states of isoelectronic YO and ZrN and with the $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi \mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma$ electronic transition of $ZrO+$ analyzed by Phillips and $Davis.1$