Question
What is the best time and how to seperate and transplant iris's.

Answer
Dear Ron Smith,
I am not an expert pertaining to flowers, but I deal with the flowers that grow from bulbs in the autumn.  I would recommend you check with a local nursery for the specifics in your area as to relating to frost, etc.
I'm sorry I am not more help, but I certainly wouldn't want to mislead you.  
Kind Regards,
Kindred
www.eingedi.us