Do they usually have a burn ban in the end of August and beginning of September?

You may want to call the ranger station to ger an answer

Can't say

Burn bans are not based on the month. They tend to be instituted more during certain monthes. You will need to ask the rangers for that data.

Burn ban in effect now. June 2018. Burn bans when conditions call for, not by the month.

Best to contact the park on this question.

Depends on the local conditions, but the park would be a better resource on what's typical in August

Or check their website