Notre Dame

This official Towers website says it opens at 9am. So looks like earlier tickets are all gone, or it's walk ups only early on.

https://www.tours-notre-dame-de-paris.fr/en/visit/practical-information

What’s the date you’re looking at? We were able to book ahead for 9:00 and I’d highly recommend it. Not crowded at all, as part of the first group we could climb at our own pace, and we didn’t feel rushed. Plus it’s cooler early in the day.

We visited the cathedral at 8:00 and there were no crowds, then got in line for the climb at 8:50. Worked really well for us.

Second week August

Are you using the official website?

Towers of Notre Dame

For the week of August 9-16 I am seeing openings every day at 9 or 9:15 with the exception of August 15 at 10am.

Thanks so much