Can a third vehicle park overnight at Kirk Creek Campground?

No. Kirk Creek Campground caps each site at a maximum of 8 people and 2 vehicles. The base camping fee covers 6 people and 1 vehicle, and a second vehicle can be added for an extra $10 per night, but the rules do not provide for a third vehicle on a site.

The campground's own description confirms this structure: it is built around single-family sites for tent and RV camping, with gravel and grass parking at each site and no utility hookups. There is no mention anywhere in the campground information of overflow parking areas, nearby lots, or a mechanism for paying to park a third car overnight either on a site or elsewhere in the campground.

Because Kirk Creek sits on a narrow bluff along Highway 1 in the Los Padres National Forest, with no listed overflow lot, roadside parking on the highway itself is not described as an authorized option in the campground's regulations or facilities information. Groups that expect to bring more than two vehicles should plan to leave extra cars elsewhere before arriving, or split into multiple reserved sites, since the posted limit is firm at 2 vehicles per site.

Anyone booking a site should also keep in mind the other occupancy rules: the 2 consecutive night minimum stay (3 nights over holiday weekends), the 14 night maximum stay, and the fact that the base fee only covers 6 people, with each additional person up to the 8 person cap costing $10 per night. Reservations and current site-specific details are managed through Recreation.gov.

Source: https://www.recreation.gov/camping/campgrounds/233116