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California Wine Atlas

Lamorinda

AVA · Contra Costa County · District 6

27 CFR 9.254 · established 2016-02-24

Heat class II · 1991-2020 normals

Climate normals in three numbers

2,973°F-days

, Apr 1 – Oct 31

15 GridMET cells cover this region

II

112mm

season rain, Apr 1 – Oct 31

34 mm of it in the , Sep 1 – Oct 31

Warm and cool vintages since 1980

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Rain across the season, and at harvest

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The boundary

This boundaryClick to open

Hovering a shaded region names it; a click opens its page.

Measured vineyard area

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Drought categories, year by year

Contra Costa County — not Lamorinda

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What's in the ground

6.5

pH, 1:1 water

14.1cm

, whole profile

93cm

to

Well drained

, dominant condition

Distribution across 45 · mean ◆, median │, p10–p90 bar

6.5
2.5%
36.1%
available water
14.1cm
depth to restriction
93cm

Dominant

  • 35.2%
  • 10.2%
  • 8.8%
  • 7.2%
  • 6.8%

45 map units · soil described over 97.0% of the region’s area · 5.4% is water, rock outcrop or other non-soil · 83% of the described area has a restrictive layer within the profile.

Sand, silt and clay, against every other appellation

CLAYSANDSILT

Clay loam

32% sand · 32% silt · 36% clay

Sandier than 10% of California appellations and clayier than 99%. Each grey point is one appellation’s topsoil; appellations nest, so this is a distribution of places rather than of land.

Plus 2% rock fragments by volume, which the triangle does not describe — the three fractions are of the fine-earth material only.

Elevation, slope and aspect

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Bearing acreage by variety

Contra Costa County · District 6

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Price per ton

Contra Costa County · District 6

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The appellation in federal law

The boundary, in the government’s own words (581 words)

(c) Boundary. The Lamorinda viticultural area is located in Contra Costa County, California. The boundary of the Lamorinda viticultural area is as described below: (1) The beginning point is on Walnut Creek map at the water tank (known locally as the Withers Reservoir) at the end of an unnamed light-duty road known locally as Kim Road, in the Cañada del Hambre y Las Bolsas Land Grant. (2) From the beginning point, proceed south-southeast in a straight line approximately 0.8 mile to the 833-foot peak marked “Hump 2;” then (3) Proceed southeast in a straight line approximately 1.7 miles to the marked 781-foot peak south of the shared Lafayette-Walnut Creek corporate boundary line and north of an unnamed light-duty road known locally as Peaceful Lane; then (4) Proceed southeast in a straight line approximately 0.3 mile to the marked 610-foot peak southwest of an unnamed light-duty road known locally as Secluded Place; then (5) Proceed south-southwest in a straight line approximately 1.7 miles to an unidentified benchmark at the end of an unnamed unimproved road known locally as Diablo Oaks Way in section 33, T1N/R2W; then (6) Proceed southeast in a straight line approximately 0.5 mile, crossing onto the Las Trampas map, and continuing another 0.9 mile to the substation at the southeast corner of section 4, T1S/R2W; then (7) Proceed southeast in a straight line approximately 2.3 miles to the 1,827-foot summit of Las Trampas Peak, section 22, T1S/R2W; then (8) Proceed south-southeast in a straight line approximately 2.1 miles to the 2,024-foot benchmark marked “Rock 2” in section 26, T1S/R2W; then (9) Proceed west-southwest in a straight line approximately 2.7 miles to the marked 1,057-foot peak in section 29, T1S/R2W; then (10) Proceed west-southwest in a straight line approximately 2 miles to the intersection of the 1,000-foot elevation line with the Contra Costa-Alameda County line in section 31, T1S/R2W; then (11) Proceed northwest in a straight line approximately 0.4 mile, crossing onto the Oakland East map, then continuing another 0.1 mile to the 1,121-foot peak in section 30, T1S/R2W; then (12) Proceed northwest in a straight line approximately 3.6 miles to the 1,301-foot peak in section 15, T1S/R3W; then (13) Proceed northwest in a straight line approximately 1.6 miles to the 1,634-foot peak in section 9, T1S/R3W; then (14) Proceed northwest in a straight line approximately 2.2 miles to the communication tower on the Contra Costa-Alameda County line in section 5, T1S/R3W; then (15) Proceed north in a straight line approximately 0.1 mile, crossing onto the Briones Valley map, then continuing another 0.6 mile to the 1,905-foot summit of Vollmer Peak in the El Sobrante Land Grant; then (16) Proceed north-northeast in a straight line approximately 3 miles, crossing over to the 1,027-foot peak in the Boca de la Cañada del Pinole Land Grant, to the Orinda corporate boundary line; then (17) Proceed generally east along the Orinda corporate boundary line approximately 3.3 miles to the water tank at the 1,142-foot elevation in the Boca de la Cañada del Pinole Land Grant; then (18) Proceed east-northeast in a straight line approximately 1.2 miles to the 1,357-foot benchmark marked “Russell” in the Boca de la Cañada del Pinole Land Grant; then (19) Proceed northwest in a straight line approximately 0.8 mile to the 1,405-foot peak in the Boca de la Cañada del Pinole Land Grant; then (20) Proceed east-northeast in a straight line approximately 0.5 mile, crossing onto the Walnut Creek map, then continuing another 1.1 miles to the beginning point.