Mine usually start to blow about 2-3 months after they go out of heat which coincides with hormonal changes as if they had a litter.

Both my girls hold their coats for four months after their season is finished.

I would say 2-4 months until they start blowing their coat after a season. I think it also depends on the temperature. If its cold they hold the coat longer but if its warm they loose faster.

2 to 6 mo. depending on weather, outdoor time, temp in the home and which bitch of mine it is.

Mine varied greatly - I had one who would start to blow before her season ended, and another who would go 4-5 months, plus others in between. I just know once they start blowing, I stop entering.