We demonstrate a blue-detuned magneto-optical trap (MOT) of a polyatomic molecule, calcium monohydroxide (CaOH). We identify a novel MOT frequency configuration that produces high spatial compression of the molecular cloud. This high compression MOT achieves a cloud radius of $59(5)\mathrm{\mu }\mathrm{m}$ and a peak density of $8(2)\times {10}^8{\mathrm{cm}}^{-3}$. We experimentally compare several blue-detuned MOT schemes for CaOH and find good agreement between our data and Monte Carlo simulations.

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• Cold and ultracold molecules
• Molecule trapping & guiding
• Cooling & trapping