Spas with reservation required in California

Calistoga, California

MoonAcre Spa & Baths is a day spa in Calistoga with a thermal pool, hot tub and sauna, open daily 9am–5pm and geared toward families and couples.

Napa Valley, California

A hotel spa at the Napa Valley Marriott Resort, open to hotel guests by reservation, geared toward couples and families.

Big Sur, California

Adults-only hotel spa at Ventana Big Sur with ocean-view treatment rooms, outdoor cabanas for couples, and a 24-hour fitness and yoga space.

Santa Barbara, California

A moderately priced, adults-only day spa in Santa Barbara open daily except Sunday, with walk-ins welcome though reservations are recommended.

Ojai, California

A medical spa in downtown Ojai offering Botox, dermal fillers, laser treatments and facials by consultation.