NASHVILLE, Ind. (AP): A naturalist at southern Indiana's Brown County State Park says callers are already asking when the best time will be to see this fall's leaf colors.

Naturalist Katie Kogler says park staffers never really know when the peak colors might be in the heavily forested area. She says cold and sunny days can make leaves change color earlier, but rainy days can change that.

Kogler tells The Herald-Times that trees along roads seem to change colors first. She says park staffers believe that's because they don't have the insulation of the forest and are more out in the open.

A big danger to bright fall leaf colors is freezing temperatures. Kogler says if it freezes, leaves will turn brown.