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California Wine Atlas

Anderson Valley

Sub-AVA · Mendocino County · District 1

27 CFR 9.86 · established 1983-08-18

Heat class II · 1991-2020 normals

Climate normals in three numbers

2,840°F-days

, Apr 1 – Oct 31

28 GridMET cells cover this region

II

191mm

season rain, Apr 1 – Oct 31

61 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

Mendocino County — not Anderson Valley

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What's in the ground

5.9

pH, 1:1 water

16.5cm

, whole profile

119cm

to

Well drained

, dominant condition

Distribution across 56 · mean ◆, median │, p10–p90 bar

5.9
5.2%
20.4%
available water
16.5cm
depth to restriction
119cm

Dominant

  • 38.1%
  • 11.8%
  • 7.1%
  • 6.7%
  • 6.5%

56 map units · soil described over 100.0% of the region’s area · 1.0% is water, rock outcrop or other non-soil · 81% of the described area has a restrictive layer within the profile.

Sand, silt and clay, against every other appellation

CLAYSANDSILT

Loam

42% sand · 38% silt · 20% clay

Sandier than 51% of California appellations and clayier than 36%. Each grey point is one appellation’s topsoil; appellations nest, so this is a distribution of places rather than of land.

Plus 11% 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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Producers

A curated roster, not a census — only source-verified entries appear, 2772 published across the atlas.

Bearing acreage by variety

Mendocino County · District 1

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Price per ton

Mendocino County · District 1

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The appellation in federal law

The boundary, in the government’s own words (273 words)

(c) Boundaries. The Anderson Valley viticultural area is located in the western part of Mendocino County, California. The beginning point is at the junction of Bailey Gulch and the South Branch North Fork Navarro River in Section 8, Township 15 North (T.15N.), Range 15 West (R.15W.), located in the northeast portion of U.S.G.S. map “Navarro Quadrangle.” (1) From the beginning point, the boundary runs southeasterly in a straight line to an unnamed hilltop (elevation 2015 feet) in the northeast corner of Section 9, T.13N., R.13W., located in the southeast portion of U.S.G.S. map “Boonville Quadrangle”; (2) Then southwesterly in a straight line to Benchmark (BM) 680 in Section 30, T.13N., R.13W., located in the northeast portion of U.S.G.S. map “Ornbaun Valley Quadrangle”; (3) Then northwesterly in a straight line to the intersection of an unnamed creek and the south section line of Section 14, T.14N., R.15W., located in the southwest portion of U.S.G.S. map “Boonville Quadrangle”; (4) Then in a westerly direction along the south section lines of Sections 14, 15, and 16, T.14N., R.15W., to the intersection of the south section line of Section 16 with Greenwood Creek, approximately .2 miles west of Cold Springs Road which is located in the southeast portion of U.S.G.S. map “Navarro Quadrangle”; (5) Then in a southwesterly and then a northwesterly direction along Greenwood Creek to a point in Section 33 directly south (approximately 1.4 miles) of Benchmark (BM) 1057 in Section 28, T.15N., R.16W.; (6) Then directly north in a straight line to Benchmark (BM) 1057 in Section 28, T.15N., R.16W.; (7) Then in a northeasterly direction in a straight line to the beginning point.