Growing outdoor south island nz

Yo, is it possible to start planting outdors in August? And what kind of seats? I have to put them directly at the first day outside in my pots because I can't have them inside. If August is not fine when is the earliest date when I can start putting the seats in my pots?

Chees Cody

I stayed in Dunedin before and growing outdoor was a not an option, depending what's the Temps dropping at night maybe wait until September