Wow ! That is amazing ! Hehe.Better than eating ice cream.
You should be fine, I don't think there has been a permanent closure for the season during September, certainly not in recent times. As you get towards October there is a risk of temporary closures which can be due to freezing overnight temperatures icing the road. We had to wait until lunchtime for it to open during one October as the sun went to work on thawing it out.