Planning to head up around August or Sept are sites still available?

Go to reserve America to book sites at Burlingame

Yes. Check their website

check reserve america. cross reference videos from bound4burlingame to see what they look like. Use www.bound4burlingame.com to find answers about Burlingame and the area. Created voluntarily by campers, for campers. Its the only place you will find 360° videos and photos of every campsite in the park. Follow Bound4Burlingame on social media to show support for their efforts.

Check their website