What is the best time of day to see the rainbow at the Cave of the Winds?

Late morning, around 11 AM to 1 PM, is your best bet. In summer, aim closer to 11; in fall or spring, push toward noon. The walkway faces north-ish, so the sun needs to be high enough in the south to hit the mist at the right angle. Show up early anyway for thinner crowds and a clear view before the mist soaks you.