I'm talking about the frost at the end of your growing season. I have no clue where you live.

Outdoors in the northern hemisphere, a plant will start flowering in early August or late July depending on what sort of light it gets during the day. The only exception is ruderalis crosses, and Haze is NOT one of those!
12 weeks from August 1st, assuming the plant is sexually mature by then, is October 24th.

Do you get frost by October 24th?