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California Wine Atlas

Ramona Valley

AVA · San Diego County · District 16

27 CFR 9.191 · established 2005-12-07

Heat class IV · 1991-2020 normals

Climate normals in three numbers

3,737°F-days

, Apr 1 – Oct 31

31 GridMET cells cover this region

IV

77mm

season rain, Apr 1 – Oct 31

25 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

San Diego County — not Ramona Valley

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What's in the ground

6.4

pH, 1:1 water

10.1cm

, whole profile

76cm

to

Well drained

, dominant condition

Distribution across 94 · mean ◆, median │, p10–p90 bar

6.4
1.0%
13.5%
available water
10.1cm
depth to restriction
76cm

Dominant

  • 38.1%
  • 18.0%
  • 8.2%
  • Visalia5.3%
  • 4.5%

94 map units · soil described over 93.1% of the region’s area · 19.3% is water, rock outcrop or other non-soil · 86% of the described area has a restrictive layer within the profile.

Sand, silt and clay, against every other appellation

CLAYSANDSILT

Sandy loam

62% sand · 24% silt · 13% clay

Sandier than 92% of California appellations and clayier than 4%. Each grey point is one appellation’s topsoil; appellations nest, so this is a distribution of places rather than of land.

Plus 8% 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

San Diego County · District 16

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Price per ton

San Diego County · District 16

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The appellation in federal law

The boundary, in the government’s own words (226 words)

(c) Boundary. The Ramona Valley viticultural area is located in central San Diego County, California. The area's boundaries are defined as follows— (1) Beginning in the southwest corner of the Borrego Valley map at the 882-meter (2,894-foot) peak of Woodson Mountain, T13S, R1W, proceed straight north-northwest approximately 3.25 miles to the 652-meter (2,140-foot) peak of Starvation Mountain, T13S, R1W (Borrego Valley map); then (2) Proceed straight east-northeast approximately 12.5 miles to the Gaging Station on the northwest shoreline of Sutherland Lake, T12S, R2E (Borrego Valley map); then (3) Proceed straight southeast approximately 4.4 miles to the 999-meter (3,278-foot) peak of Witch Creek Mountain, T13S, R2E, east of Ballena Valley (Borrego Valley map); then (4) Proceed straight south-southeasterly approximately 6.6 miles, crossing onto the El Cajon map, to the summit of Eagle Peak (3,166 feet), T14S, R3E, northeast of the El Capitan Reservoir (El Cajon map); then (5) Proceed straight west-southwest approximately 12.7 miles, passing through Barona Valley, to the peak (1,002 feet) near the center of the unnamed island in the San Vicente Reservoir, T14S, R1E (El Cajon map); then (6) Proceed straight northwesterly approximately 3.9 miles to the 822-meter (2,697-foot) peak of Iron Mountain, T14S, R1W (El Cajon map); and (7) Proceed straight north-northwest approximately 2.8 miles, crossing onto the Borrego Valley map, and return to the beginning point at the peak of Woodson Mountain.