Most people pair up their balls October-ish through February-March, but there's really not a set breeding season and plenty of people breed year round. And weight isn't the only factor to consider, as age and build of the snake are important. A thick 1,200 gram girl that's 3-4 years old is a better bet to successfully breed than an 18-20 month old girl that's 1,600 grams, but not quite bulked up yet. That being said, you're probably best off waiting on her till the fall.