The Del Mar Drive-In on Via de la Valle, across the street from the Del Mar Fairgrounds, opened in 1953 with space for 700 cars. Operated independently for its first two years, it was eventually run by William Oldknow and Sero Amusements, a company that hired him as president but which he'd come to own. "The Del Mar had a giant tiki sign on the entranceway that went right across the driveway," recalls Teri Oldknow, "with a giant catamaran painted with sort of tiki hatching. It was really cool."
From the start, the Del Mar decided to remain open seven nights a week, since many film studios at the time refused to provide new first-run films to theaters open weekends only. During most of the '50s, admission was $1 per carload on weekdays and 50 cents per person on weekends (children were free) -- the real profits, as at most ozones, were in the concession stand.
As patron perks, they offered free baby-bottle warmers, and for a time, a "live monkey house" was advertised as being on the playground.
Sero was operating so many drive-ins that the speakers at the Del Mar and elsewhere were actually manufactured specifically for Sero and carried the company's imprint on the front of their metal casings. "We made them in Pomona with a company called Bevelite from the mid-'50s through about the late '60s," recalls Teri Oldknow. "They made the speakers for the Pacific Theatres, too."
After being closed for a while, the Del Mar underwent remodeling in early 1979, reopening on Memorial Day weekend with a free open house featuring High Ballin’ and Stingray. However, despite spending over $15,000 on improvements, business failed to pick up.
In late 1979, the Oldknows announced they were selling the Del Mar Drive-In lot for commercial use. "Developers came in and built a huge sea of condominiums... it was too much money to turn down at the time," says Teri Oldknow.
Today, as of 2026, the former entrance is now the Pamplemousse Grille.