breeding seasons

Question
what time of the year do african side neck turtles breed, and what time do red ear sliders breed?

Answer
That is a care question, and as my profile clearly states, I do not handle turtle care questions. Both probably breed in the spring, but someone at someplace like http://www.turtleforum.com can help you more with that.

And I do hope you are not still thinking they will cross-breed. I hate to say never, but they are just too far apart in the evolutionary scale- not closely enough related for that to work.