Pre-rut and rut: dawn and midday sits compete with evening, and seeking-phase mornings are some of the highest-percentage hunts of the year. Outside the rut: evening on food, morning on bedding-area edges with quiet access.
This is why all-day rut sits work — the dawn-dusk rule that governs October hunting collapses during peak breeding. See state rut date pages for the windows when midday and dawn pay off equally.