I know that the application opens in August and that they have to be completed by the end of September. What would be the best time to ask for recommendation letters from my teachers? I was thinking about asking sometime in June but it seems a little too early. However, if I ask when school starts in September, they might not have enough time.
Talk with them now. That way they can have their notes organized well before your letters are due.
Ask ahead, yes sept is way too late. When you get agreement, you can say you will send a reminder by email 2 weeks before due date or something.
Thank you!