I'm not sure exactly what you're asking --do you mean when does the new season start?
My male geckos usually stop trying to mate with the females around now. I've gotten eggs as late as Oct., but I think for this season they're just about done. I remove the males from the females some time around Oct-Nov and put the males in with their new groups around Jan though the females aren't usually ovulating yet. Around Feb /Mar they're ovulating and I get my first eggs around then, though they're rarely good. My first hatches have been in May lately.
Most leopard geckos in the northern hemisphere seem to ovulate generally about Feb to Aug but some ovulate on their own at other times and some breeders are able to cycle their females so they have someone breeding any month of the year (lighting and temperature variations can do this).