  We prove effective equidistribution of horospherical flows in
$\operatorname{SO}(n,1)^\circ / \Gamma$ when $\Gamma$ is geometrically finite
and the frame flow is exponentially mixing for the Bowen-Margulis-Sullivan
measure. We also discuss settings in which such an exponential mixing result is
known to hold. As part of the proof, we show that the Patterson-Sullivan
measure satisfies some friendly-like properties when $\Gamma$ is geometrically
finite.
