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California Wine Atlas

Redwood Valley

Sub-AVA · Mendocino County · District 1

27 CFR 9.153 · established 1996-12-23 · last amended 2014-10-09

Heat class III · 1991-2020 normals

Climate normals in three numbers

3,153°F-days

, Apr 1 – Oct 31

16 GridMET cells cover this region

III

196mm

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 Redwood Valley

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What's in the ground

6.3

pH, 1:1 water

16.1cm

, whole profile

130cm

to

Well drained

, dominant condition

Distribution across 57 · mean ◆, median │, p10–p90 bar

6.3
2.8%
21.5%
available water
16.1cm
depth to restriction
130cm

Dominant

  • 24.6%
  • 11.0%
  • 10.6%
  • 8.6%
  • 6.2%

57 map units · soil described over 99.7% of the region’s area · 1.3% is water, rock outcrop or other non-soil · 54% of the described area has a restrictive layer within the profile.

Sand, silt and clay, against every other appellation

CLAYSANDSILT

Loam

45% sand · 33% silt · 21% clay

Sandier than 64% of California appellations and clayier than 43%. Each grey point is one appellation’s topsoil; appellations nest, so this is a distribution of places rather than of land.

Plus 16% 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

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 (407 words)

(c) Boundary. The Redwood Valley viticultural area is located in the east central interior portion of Mendocino County, California. The boundaries of the Redwood Valley viticultural area, using landmarks and points of reference found on appropriate U.S.G.S. maps, are: (1) The beginning point is in the northeastern portion of the Ukiah map at the point where State Highway 20 crosses the R11W/R12W range line along the south bank of the East Fork of the Russian River, T16N/R12W. From the beginning point, proceed north along the R11W/R12W range line, crossing onto the Redwood Valley map, to the northeast corner of section 1, T16N/R12W; then (2) Proceed west along the northern boundary of section 1 to the section's northwest corner, T16N/R12W; then (3) Proceed north along the eastern boundary lines of sections 35, 26, 23, 14, 11, and 2 to the T17N/T18N common boundary line at the northeast corner of section 2, T17N/R12W; then (4) Proceed west along the T17N/T18N common line to the northwest corner of section 6, T17N/R12W; then (5) Proceed south-southwesterly in a straight line, crossing onto the Laughlin Range map, to the intersection of the 1,400-foot contour line and Bakers Creek within McGee Canyon, section 25, T17N/R13W; then (6) Proceed southeasterly in a straight line approximately 1.5 miles, crossing onto the Redwood Valley map, to the southeast corner of section 36, T17N/R13W; then (7) Proceed west-southwesterly in a straight line approximately 0.55 mile, crossing onto the Laughlin Range map, to the intersection of U.S. Highway 101 and an unnamed road known locally as Reeves Canyon Road, section 1, T16N/R13W; then (8) Proceed southeasterly in a straight line approximately 0.9 mile, crossing onto the Redwood Valley map, to the southeast corner of section 1, T16N/R13W; then (9) Proceed south-southwesterly in a straight line approximately 0.65 mile to the intersection of an unnamed, unimproved road and an unnamed, intermittent stream, approximately 500 feet south of Seward Creek, section 12, T16N/R13W; then (10) Proceed west-southwesterly in a straight line approximately 0.9 mile, crossing onto the Laughlin Range map, to the southwest corner of section 12, T16N/R13W; then (11) Proceed east-southeasterly in a straight line, crossing onto the far northeastern corner of the Orrs Springs map, then continuing onto the Ukiah map, to the intersection of State Highway 20 and a road known locally as North State Street (old U.S. Highway 101), north of Calpella, T16N/R12W; then (12) Proceed easterly along State Highway 20, returning to the beginning point.