It depends on your session location. Parks and shaded areas near buildings etc. are more forgiving at different times of the day. Mostly I suggest sunrise and sunset. Here's why...

[Writing this from the car as I wait on my sunrise session client to arrive!]

Now for the...

Surprise! I loved every second of this adorable session with Joseph & Kate. 

Joe did such an amazing job taking his time to plan this special moment with his future bride :) I LOVED being a part of it!