I like to go in may or September or October not to hot just when I like to go
There are different animals active at each season so anytime would be good. But the extremely hot days would be the least active for the outdoor animals. Even winter is nice. No crowds and many of the animals like the colder weather.
when its not raining usually round may
This is just my personal opinion, but early Autumn would be the time I would expect most of the animals to be active, where temperatures are not high and humidity levels are lower. Also, earlier in the day would be a better time than waiting until later in the afternoon. I hear Ohio is beautiful during this time of year when the leaves are changing colors.
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