Hidden Valley Zen Center occupies a property in San Marcos, in northern San Diego County, California, set in a quiet rural area in the hills inland from the coast. The center is affiliated with the Diamond Sangha network founded by Robert Aitken Roshi in Hawaii, which traces the Sanbo Kyodan / Sanbo Zen lineage descending from Hakuun Yasutani Roshi. The center was founded by Yamada Ryoun Roshi-line teachers in the broader Diamond Sangha and Pacific Zen network, drawing on the koan-curriculum tradition that distinguishes the Sanbo Zen approach from purely Soto-style shikantaza-only practice. The campus includes a meditation hall (zendo), residential buildings for staff and longer-term residents, dining facilities, and walking grounds across the rural property. The setting is rural southern California with chaparral hills, oak woodland, and a quieter atmosphere than the urban Zen centers in Los Angeles, San Diego, or San Francisco. The Diamond Sangha lineage has historically had a strong presence in California; Hidden Valley is one of the principal sites in southern California specifically. Programming includes the standard Zen monastic forms: regular zazen, weekly public sittings, monthly zazenkai (daylong sittings), and multi-day sesshin following traditional form. Koan-curriculum training is available with the resident teachers; practitioners working through the Sanbo Zen koan curriculum can do formal dokusan and progress through the classical koan cases over years of training. The center accommodates both newer practitioners (with introductory programs and beginning instruction in zazen forms) and long-time students working through extended koan practice. The Diamond Sangha and Pacific Zen network includes affiliated centers across the US, in Australia, in Argentina, and in other countries. Hidden Valley sits within this broader network and shares teachers and practitioners with sister centers regularly. Practitioners often move between centers for sesshin and longer training depending on schedule and teacher relationships. The network's character has been shaped by the broader teaching of Robert Aitken Roshi (1917-2010), one of the principal Western Zen teachers of the 20th century, and the subsequent generation of Diamond Sangha-trained teachers carrying the lineage forward.
Daily and weekly programs include morning zazen, weekly Sunday-morning sittings with zazen, kinhin, service, and a dharma talk, and monthly zazenkai (daylong sittings). Sesshin run typically five to seven days following traditional Zen monastic form: 4 a.m. wake-up, alternating zazen and kinhin in 35-50 minute periods, oryoki meals in the zendo, daily teisho, dokusan with the teacher, and silence held for the duration. Koan-curriculum training is available with the resident teachers in the formal Sanbo Zen progression. Posture follows traditional Zen forms.
The teaching line is the Sanbo Kyodan / Sanbo Zen lineage descending from Hakuun Yasutani Roshi, by way of the Diamond Sangha founded by Robert Aitken Roshi in Hawaii in 1959. The Diamond Sangha network includes affiliated centers in the US, Australia, Argentina, and elsewhere. Hidden Valley's resident teachers are in this lineage. Aitken Roshi died in 2010; the subsequent generation of Diamond Sangha-trained teachers carries the lineage forward.
Practitioners in the Sanbo Kyodan lineage who want a southern California sister center to the broader Diamond Sangha network.
Zen practitioners who want to undertake formal koan work in the structured Sanbo Zen curriculum, with regular dokusan interviews at a local center.
Sitters in greater San Diego who want a rural Zen center within driving distance, distinct from the urban centers in San Diego, Los Angeles, and the Bay Area.
For a first visit to a Sunday morning program, arrive 15 minutes early to receive zendo orientation: how to bow, how to enter, how to sit, how to walk in kinhin. Wear loose dark clothing. The morning includes zazen, kinhin, service, dharma talk, and sometimes tea. Dokusan is offered for students with established teacher relationships. For sesshin, prior sitting experience and registration in advance are required. Cold-weather clothing for southern California winter mornings is sometimes needed; otherwise the climate is mild year-round.
The campus includes the zendo, residential buildings, dining facilities, and walking grounds in the rural San Marcos hills. Lodging during sesshin is in shared rooms or dormitories. Bathrooms are shared. Meals are vegetarian, oryoki-style during sesshin. Walking grounds extend through chaparral and oak woodland on the property. The setting is quiet rural southern California with mild mediterranean climate.
Public sittings are donation-based. Sunday morning programs ask for a basket donation. Zazenkai daylongs and sesshin are fee-based, typically USD 100 to 1,200 depending on length, covering lodging and meals. Teacher dana is separate. Scholarships and work-exchange are available through the registration office. The center is supported by program fees and donor contributions within the Diamond Sangha network.
A Diamond Sangha southern California Zen center, in the Sanbo Kyodan koan-curriculum lineage.
Hidden Valley is part of the broader Diamond Sangha and Pacific Zen network of centers that descends from Robert Aitken Roshi's teaching in Hawaii starting in 1959. The Diamond Sangha holds the Sanbo Kyodan / Sanbo Zen lineage descending from Hakuun Yasutani Roshi. The network includes affiliated centers in the US, Australia, Argentina, and elsewhere. Hidden Valley is one of the southern California sites in this network.
Yes. The Sanbo Zen curriculum includes structured koan training with formal dokusan interviews. Practitioners typically begin with breath counting or shikantaza, then move into koan work as the teacher determines, working through the classical koan curriculum (Mu, the Mumonkan, the Hekiganroku) over years of training. Koan study at Hidden Valley follows the standard Sanbo Zen progression.
For Sunday morning programs and weekly zazen, no. The center provides zendo orientation 15 minutes before public programs for first-time visitors. For sesshin and koan training, prior sitting experience and an established teacher relationship are typically expected. The center runs introductory programs for newer practitioners several times a year.
Both are southern California Zen centers but in different lineages. ZCLA is in the Maezumi Roshi lineage (a synthesis of Soto, Rinzai, and Sanbo Kyodan transmissions). Hidden Valley is more specifically in the Sanbo Kyodan / Diamond Sangha lineage. Both teach koan study; the specific lineage emphasis, the teacher relationships, and the institutional connections differ. Practitioners typically choose based on lineage preference, teacher fit, and location.
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