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    Osmosis Day Spa Sanctuary

    4.2 (565 reviews)
    Ultra High-EndMassage, Skin Care, Day Spas
    Closed • 9:00 am - 9:00 pm

    By appointment only

    Services - Osmosis Day Spa Sanctuary

    Deep tissue massage

    Reflexology massage

    Swedish massage

    Osmosis Day Spa Sanctuary Photos

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    Recommended Reviews - Osmosis Day Spa Sanctuary

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    Reviews With Photos

    Peace
    Tejaswini L.

    We spent a relaxing afternoon at Osmosis Day Spa and I can't wait to plan next visit here. We had a nice massage followed by a Cedar enzyme Bath. Staff here was so kind and friendly. I loved how everything was explained so nicely. The meditation garden and walk was peaceful too. Definitely a must visit place!

    Meditation garden
    William O.

    I have been going to Osmosis Spa for about 20 years since I first moved to the Bay Area. It is one of the most unique spas I've ever been to and I feel like I've been to many spas. I come in about once a year to do their signature cedar enzyme bath and either get a massage or a facial. The cedar enzyme bath is what makes the place super unique as it is not done almost anywhere else in the whole country. When you arrive at Osmosis you immediately feel a sense of calm. As a guest, you have access to their meditation garden in the back. I always try to arrive early to go to the garden before my services. Next, they do a tea ceremony as part of the bath experience. The tea is mixed with enzymes that always make my stomach feel happy. I want to give a shoutout in particular to Samundra, who is a wonderful attendant. When the bath is ready you get into what is essentially a bath of fermented, warm sawdust. At first, it may be kind of weird, but you get used to it. It heats you up as you lay there. The attendant will bring you water and put cold, wet towels on your head. After you're done (20 minutes) you need to get all the cedar off of you with an exfoliating glove then take a shower. Your skin feels amazing and you feel so relaxed. I had a facial on my last visit and it was a wonderful facial that made my skin feels amazing so hydrated. My skin was glowing when I looked in the mirror. There are so many things to love about Osmosis. Come and check it out!

    Meditation garden pond
    Raina D.

    Everything about this place is amazing! First of all this is not a modern chic style spa resort. So don't expect that you'll be disappointed. This is a very beautiful place that has a Japanese type touch to its style but is very down to earth. The Japanese garden is very pretty. There is plenty of places to relax before, after and in between services that are very relaxing. The place is accommodating with lovely teas, cocktail mix nuts for snacking, fruit infused waters, and fresh water in areas too. I had the Ultimate Spa Experience Package, it was for my weekend getaway with my daughter, and worth every penny! Top 5 facial and massage that I've ever had and I've had them in places like Finland, really all over Europe in various countries, lots to compare to. Trust me they are amazing ! The package came with the tea experience too that is where you start before the epic enzyme cedar bath. The tea experience is really so nice, and my only complaint is that the Koi pond needs some attention because there should be an algae eating fish or a filter system in the pond. I'm no expert but it seemed lacking for the koi fish somehow. Otherwise very enjoyable. The Cedar Enzyme bath is wayyyy better than the mud bath experience in my opinion. I liked the mud bath experience I had previously and I've done a couple but to me this is more relaxing. We had a nice little lunch in between the services and it was a little short in my opinion it didn't give us enough time to really enjoy the garden areas or the hammocks, so if you want to book the ultimate package go early like 40+ minutes early, maybe more to enjoy the outside first. Don't get distracted by the gift shop like I did, do that after everything. Definitely don't go hungry into the Ultimate package experience either you'll be famished by lunch time. It's just more comfortable to have eaten something before. So if you can swing it do the Ultimate package, I had never slept better, that night I slept like a baby, best nights rest ever ! I will be coming back, absolutely wonderful experience!

    Jenny X.

    Came here for a day trip and it was awesome! Good: - The cedar enzyme bath is super unique - you get buried in this warm dirt and sit there and really start heating up - it's nice since the staff feed you water so you can stay in there longer and help clean off the sweat from your head - The place has a beautiful meditation garden and it was super empty at 9 am so we were the only ones in there - The staff are really nice and helped us get started with our service and explained a lot Bad: - The place is pretty small and out of the way so hard to come again! Overall enjoyed this experience and it was calming!

    Tea garden
    Laura B.

    I went to Osmosis for the first time last night with a friend. I booked a 7:30 pm reservation for a 2-person cedar enzyme bath at 9:00 am the morning of (a Sunday). Kelly helped me on the phone & was incredibly helpful, friendly & kind. I recommend calling in if you can - the web portal is okay but lost our reservation from the night before, likely because we tried to book an unavailable service. Before going, we visited Russian River Brewery in Windsor. I recommend a healthy but hearty meal beforehand, and you're probably better off on a day you don't drink wine (I say, as someone who did). We arrived about 10 minutes before our start & were immediately on our way into our dressing rooms to don plush green robes. There are lockers with keys available to safely store belongings during the bath service. If you're comfortable, I recommend leaving all of your clothes behind to make the most of the experience. We were seated in a tea room overlooking a beautiful garden, and served an enzyme tea (peppermint) - it was relaxing to center in the tea room before heading into the bath. We were guided to a small room with a large pit of sawdust in it. The entire place smells of this fermenting enzyme mix, and it can be a bit intense if you're not expecting it. I stepped outside as my partner got undressed and into the dust. I then entered & got in. We kept our towels on and removed them once we were buried - I don't recommend doing this, because you'll want these towels when you shower after. We were in the bath for 20 minutes, with our attendant coming in every 5 minutes to put cold washcloths on our heads. I politely declined water; I don't recommend doing that - you're going to want to hydrate throughout the experience, especially if saunas have an impact on you. It was also recommended that I cover my long hair with a net, which I'm grateful I did. I loved the experience of the bath, and tried to stay as submerged as possible. I could feel my pulse throughout my body, and my face was sweating. When we got out, they gave us special silicone oven mitts to scrape off all the sawdust with on a patio. Afterwards, a shower with very nice soaps is provided, then I went back to my dressing room & changed before tipping my attendant and leaving. The entire experience takes a bit over an hour, and is worth every penny. A fantastic choice if you're looking for a uniquely Sonoma experience.

    Meditation area
    Stephanie B.

    I had a facial service here recently which was very nice and relaxing. The property was tranquil and clean. I love that they had a tea station outside that you could help yourself to. My reason for a decrease in star was that when I checked in they didn't offer a locker or robe, maybe they only do that for certain treatments? And there was no discussion of how to walk the grounds after your service, almost felt like they wanted me to leave after the service. And there is just something about walking around in your street clothes after a spa treatment trying to meditate that just isn't as comfortable.

    Building
    Marquita J.

    I went here during my visit to Napa Valley for my birthday weekend and everything was decent until the end. Let me explain... I booked the Cedar Bath and Massage appointment. When booking this, you have to submit a request for booking and they send you times available. This was went without a hitch and I was able to book my appointment. But it would be nice if this could just be booked online directly like their other appointments. After booking, they send over forms to complete as well as well as an email with policies. Great. Still all good! Upon arrival, there was enough parking for me to choose from and enter the facility. I was instantly greeted and taken to the changing room to get ready for my treatment. Also, they give you a watch you can wear in the bath and massage that helps you lock and unlock your locker. After getting ready and before starting my treatment, I went to a tea room that overlooked a garden which was so nice and peaceful. The tea was delicious as well. I started my treatment with the cedar bath. That felt so good to my shins that had been in pain for weeks. And the bath attendant was great with check ins and providing water. But it's definitely a journey to get all those cedar chips washed off afterwards lol. Next, I went to my massage. My massage was decent and needed. But this was the first time someone just started massaging my scalp without asking. I didn't like that after touching my feet that had to be on the shower floor as there were no shoes to wear in there. It would be great to ask before digging in if that is warranted. But what was really disappointing is there wasn't any pre communication that American Express was not accepted. I had to find a card that wasn't American Express to use. I booked the appointment knowing I was going to use my company's benefit where I must use the corporate American Express card in order to receive it. Additionally, I don't know what they would've done if I had not brought another form of payment. Communicating payment methods is crucial and it was disappointing and ruined the experience (as my blood pressure raised and I left with disappointment and a jacked up budget). I would not return based on that. If you do not have American Express, still make sure you confirm your payment is accepted and there are no additional fees.

    Front garden

    Incredible massage from Joy. She was kind and skilled. Such a tranquil and pampering environment. The garden is absolutely beautiful. Reservations were handled in a welcoming manner. I appreciated the reminder texts. I look forward to another visit soon.

    Ash L.

    A true gem. An absolute must if you're in the Northern California area. The staff is so, so wonderful and calming. The cedar bath is unlike anything I've ever experienced... so calming. The massages were out of this world. If you're someone who likes spa and massage, I'd literally consider this a reason to travel and visit NorCal.

    Carla S.

    Wonderful Experience. Annabelle was lovely, she hosted my enzyme bath and brought me tea, and placed cool lavender towels on my forehead. The enzyme bath was deeply relaxing, warm and aromatic. Emily gave me an exceptional deep tissue massage relieving my neck and hip pain. The meditation gardens were beautiful.

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    3 months ago

    I had the hour and a half swedish massage. It was great. It was my second time after after 8 years. A beautiful experience.

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    9 months ago

    We love coming here. Very zen in everything they do. The surroundings, service and quality of massage therapists is excellent.

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    4 months ago

    Great spa experience. The cedar bath is a must try. Relaxing massage. Just missing the Sauna and Steam options.

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    5 months ago

    Beautiful grounds and great service. On the pricey side so it's a splurge but a nice treat.

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    Page 1 of 15

    Ask the Community - Osmosis Day Spa Sanctuary

    Can an adult bring a 10 year old?

    Thank you for your inquiry. We do have established minimum age requirements for certain services: Facials: guests aged 14 and older.… 

    How do I make an appointment?

    Hello, You may make an appointment request through our website: www.osmosis.com, via email at reservations@osmosis.com or you can give us a call at 707-823-8231. We look… 

    Can people with eczema still do this?

    Yes, as long as there are no breaks in the skin.

    Is the sand for the cedar bath cleaned after every person uses it? Or how is it cleaned in general?

    We do not use sand. The bath material is a combination of natural ingredients including the most fragrant cedar in the world and rice bran. The tubs are changed every two weeks in order to replenish the aromatic quality of the cedar. The heat in the… 

    Which of your treatments are pregnancy safe?

    Thank you for your question. We especially offer a pregnancy massage. Our facials are safe for pregnant women as well. The cedar enzyme bath is NOT suited for pregnant women.… 

    Is there a jacuzzi?Or sauna?

    No, not that kind of place.... It's MUCH better!

    View All 7 Questions

    Review Highlights - Osmosis Day Spa Sanctuary

    “The most memorable part of the day was the cedar enzyme bath, which was such an interesting experience.”

    Mentioned in 95 reviews

    Read more highlights

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    Osmosis Day Spa Sanctuary - massage - Updated October 2026

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