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).
Phone: 707.994.4068

COVID-19; Re-opening

During the Re-opening phases, rules and regulations change frequently. If in doubt, please call 707.994.4068 for updates, or check our Facebook page

WINE TASTING and PICNICS during Re-opening

We offer outside tastings and also invite customers to enjoy a picnic by the Six Sigma tasting room.  We’ll be happy to provide separate tables for social distancing. Appointments are suggested.

Please call 707.994.4068 for details, and to reserve a table.


We invite you to enjoy hiking and biking on our roads and trails. We just ask you to fill out a Liability Release Form and drop it off in the tasting room at your first visit. For your next visits, just check in at the tasting room. You can download Liability Release Form for Hiking and Biking here: pdf  – or pick up the form at the tasting room

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“. Tour 1 + 5 – The roads , Tour 2 + 3 – Creek + Winery Trails , Tour 4 – Happy Camper Trails

PINZGAUER TOURS during Re-opening

We offer  Pinzgauer tours on Saturdays at 10 am, 12 noon, and 2 pm.  For reservations, please call 707.994.4068. Private tours available by appointment.

Follow us on Facebook or join our mailing list to learn about special wine shipping offers, local delivery options, and news from the 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.

The Stage Coach Stop Tasting Room

Pouring wine at the Six Sigma Tasting RoomWhen 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 $15 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

Vineyard tour at Six Sigma RanchExplore 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 RanchOur Club Members enjoy free access to 10 miles of beautiful mountain bike trails. Please check in at the tasting room if you want to bike or hike the trails. Trails are open 9 am to 4 pm. Bring up to two non-member guests. We also welcome non-members to try the trails on a $20 day pass before joining the club.

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.

Our trail system grows and evolves all the time, but here is a map of common routes: Open map

Private Ranch-to-Table Dinners

Ranch to Table dinner at Six Sigma Ranch

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 Mr. T at 707.994.4068 for questions and reservations.

“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.