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 hint in the Directions section at the bottom of this page).
Phone: 707.994.4068

The Stage Coach Stop Tasting Room

When 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.

Pouring wine at the Six Sigma Tasting Room

Picnic Area

We invite our Club Members and other 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.

Regular Wine Tasting

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. (Closed Thanksgiving Day and Christmas Day)

The tasting fee is $15 per person; the charge is waived with purchase. Tasting is complimentary for Club Members.

Private Events

Ranch to Table dinner at Six Sigma Ranch
Private Casual Meal

Let us help you plan a private casual meal, buffet style. Call 707.994.4068.

Catering fee: Quoted and charged through Six Sigma

Wine: Select and purchase bottles of Six Sigma wine separately

Service fee: $25/hr per server.

Private Ranch-to-Table Lunch or Dinner

For an unforgettable event, book a private version of our famous Ranch-to-Table dinners, served at the table. Let us help you plan a menu based on wine and meat raised at Six Sigma Ranch. Four Courses with wine pairing (3 oz wine per course). Call the Tasting Room at 707.994.4068 for questions and reservations.   $130 per guest

Pinzgauer Vineyard Tours

Vineyard tour at Six Sigma Ranch

Explore 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 $25 per guest (wine tasting included).

Private Tours

Private tours and tastings are available by appointment. Price: $150 for 2-10 people. Please call 707.994.4068 to book a reservation at least 24 hours ahead.

 World Class Mountain Bike Trails

High School Mountain Bikers at Six Sigma Ranch

We invite our Club Members to enjoy hiking and biking on our roads and trails, open 9 am to 4 pm. Bring up to two non-member guests.  Day passes are available for non-members for $10 per day for a family (or group arriving in the same vehicle). Please fill out a Liability Release Form and drop it off in the tasting room at your first visit. You can download Liability Release Form for Hiking and Biking here pdf  or pick up the form at the tasting room. Make sure you check in at the tasting room each time you visit!

We are honored to host the Nor-cal High School Mountain Bike Championships each year for over 800 students at the ranch, and also welcome use of trails by high school athletes accompanied by coaches for training throughout the year. Day passes are complimentary for students with valid student ID.

We have a “Trail Fund” box by the Tasting Room and welcome you to make a donation to our trail maintenance efforts.

Download our Oak Guide for Fall, Wildflower Guide for August & September, Wildflower Guide for July , Wildflower Guide for June , Wildflower Guide for May , Wildflower Guide for March-April ,

Download a list of Hiking & Biking Tours: “Hiking & Biking Menu”

Download the Trail Map for Asbill Valley

Download “Hike and Bike With Common Sense”

Download Guide to the Road and Trails in ASBILL VALLEY – Trails #2 and #3

Download Guide to “THE ROADS” – Sorensen Ave. and Eagle Rock Rd. – Tour #1 + #5

“Ranch-Stays” for RVs and Trailers

Club Members and members of Harvest Host can camp at Six Sigma Ranch

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 twelve 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.

Interested in Star Gazing? Contact Angelo with Dark Sky Events to experience a tour of the night sky while staying at Six Sigma. (707) 569-6474 angelo@darkskyevents.com

Huttopia Wine-Country at Six Sigma Ranch

There’s more than one way to spend the night at Six Sigma Ranch. Learn about the new glamping resort at the Ranch – Huttopia Wine-Country !

The Bistro at Huttopia Wine Country at Six Sigma Ranch



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.

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