Visit Our Historic Tasting Room and Tour the Ranch

Tasting room at Six Sigma Winery


Six Sigma Ranch & Winery is located southeast of Lower Lake in beautiful Lake County. The winery is less than an hour drive north of Napa Valley, and approximately 100 miles from San Francisco and Sacramento.

Address: 13372 Spruce Grove Road, Lower Lake, CA 95457. (Please see warning in the Directions section).
Phone: 707.994.4068


Please be careful if you search “Six Sigma Ranch” to find directions. Some devices will aim at sending the unsuspecting traveler to our locked service gate on Morgan Valley Road, about 10 miles from our front gate. Search the address instead: 13372 Spruce Grove Road, Lower Lake, CA 95457.

The Stage Coach Stop Tasting Room

IMG_7401-250wideWhen you come to visit our tasting room, you’ll trek down the 2-mile drive from our front gate at Spruce Grove Road. The road follows Asbill Creek, named after the first family of settlers who made the valley their home in the late 1850’s. Our tasting room is located on a site that once was a stagecoach stop, and the cozy cabin sits among century-old Valley Oak trees.

We are open for tasting daily from 11:00 am to 4:30 pm, and our friendly staff will introduce you to our current releases.

The tasting fee is $10 per person; the charge is waived with purchase. Tasting is complimentary for Wine Club members.

We invite our customers to enjoy the oak-shaded picnic area that surrounds the tasting room, the perfect spot for a relaxing lunch!

Call at 707.994.4068 to learn about our special Wine Country Picnic – or click here.

Pinzgauer Vineyard Tours

IMG_7749-christian-x-300wideExplore the ranch in our all-terrain Pinzgauer! Learn about the soils and climates that make Six Sigma Ranch unique. The tour includes a visit to our high-elevation vineyard site, the Diamond Mine Vineyard.

The Pinzgauer can hold up to 10 people, so bring along a group of friends!

Occasionally, we may have to reschedule tours because of rain.

Regular Tours

Regular tours are on Saturdays, at 10am, 12 noon, and 2pm. Call 707.994.4068 for reservations. Only $20 per guest (wine tasting included).

Private Tours

Private tours and tastings are available by appointment. 6 guest minimum. Please call 707.994.4068 to book a reservation at least 24 hours ahead.


 “BLT” Harvest Tours 2018

Saturdays: August 4, 11, 18 and September 1, 8, 29

Our “BLT Sandwich Tours” will be back in August and September by popular demand. Enjoy a Pinzgauer tour followed by a BLT picnic lunch featuring our ranch-raised bacon and a glass of wine served after the tour of the the vineyard.



Private Ranch-to-Table Dinners

For an unforgettable evening, book a private version of one of our famous Ranch-to-Table dinners. Let us help you plan a menu based on wine and meat raised at Six Sigma Ranch. Call Patty at 707.994.4068 for questions and reservations.




“Ranch-Stays” for RVs and Trailers



We invite our Club members as well as members of Harvest Host to spend a night under the stars in their RV or Trailer. The four spaces on site accommodate RVs up to 45 ft., with easy “no-backing” access. (No hookups).

Call 707.994.4068 at least 24 hours ahead to make your complimentary reservation.

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