yes, early morning is really good for red polls and northern shrikes...also the coyotes are seen most often around 7am.
as for the owls, i noticed them around 5ish (dusk), and saw a lot of activity after 6. saw the bald eagle out on the lake ice beside the bird banding station around 6:30...
so i would say more 5-7pm for the owl and eagle activity...until dark, really
you can waste a lot of time on the peninsulas after the red bridge...there is so much waterfowl over there!