I find they breed late, but it probably varies between breeders. I bring my snakes out of brumation Mid March and sinaloans generally breed after my pueblans and annulata, generally late May into June, but it may depend on when they come out of brumation, and feedings.
:I have this huge pair of sinaloans, the male is 4ft and the female if 40" ..they both were cooled this year and the female shed last week so I put them together like I have been doing with all my other snakes and all the other snakes are breeding but the sinaloans..I have herd that they breed later but when? after her next shed or do I just keep puting them together till something happens??? thanks ..