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California Wine Atlas

Atlas Peak

Sub-AVA · Napa County · District 4

27 CFR 9.140 · established 1992-01-23

Heat class III · 1991-2020 normals

Climate normals in three numbers

3,398°F-days

, Apr 1 – Oct 31

9 GridMET cells cover this region

III

145mm

season rain, Apr 1 – Oct 31

46 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

Napa County — not Atlas Peak

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What's in the ground

6.1

pH, 1:1 water

11.3cm

, whole profile

80cm

to

Well drained

, dominant condition

Distribution across 26 · mean ◆, median │, p10–p90 bar

6.1
5.5%
23.7%
available water
11.3cm
depth to restriction
80cm

Dominant

  • 40.1%
  • 27.5%
  • 11.6%
  • 5.6%
  • 4.7%

26 map units · soil described over 89.3% of the region’s area · 31.1% is water, rock outcrop or other non-soil · 92% of the described area has a restrictive layer within the profile.

Sand, silt and clay, against every other appellation

CLAYSANDSILT

Loam

38% sand · 38% silt · 24% clay

Sandier than 32% of California appellations and clayier than 62%. Each grey point is one appellation’s topsoil; appellations nest, so this is a distribution of places rather than of land.

Plus 24% 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

Napa County · District 4

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Price per ton

Napa County · District 4

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The appellation in federal law

The boundary, in the government’s own words (438 words)

(c) Boundaries. The Atlas Peak viticultural area is located in Napa County, California. It lies entirely within the Napa Valley viticultural area. The beginning point is Haystack (peak) found in section 21, T. 7 N., R. 4 W. on the “Yountville” U.S.G.S. map; (1) From the beginning point, the boundary proceeds south in a straight line approximately 0.5 miles, to the highest point of an unnamed peak of 1443 feet elevation on the boundary of sections 21 and 28, T. 7 N., R. 4 W.; (2) Then southeast in a straight line approximately one mile to an unnamed pass with an elevation of 1485 feet, located on Soda Canyon Road; (3) Then easterly in a straight line approximately 0.5 miles to an unnamed peak of 2135 feet elevation; (4) Then in a generally southeasterly direction, as a series of five straight lines connecting the highest points of unnamed peaks with elevations of 1778, 2102, 1942, 1871 and 1840 feet, ending in the center of section 2, T. 6 N., R. 4 W.; (5) Then southeast in a straight line approximately 1.8 miles to the highest point of an unnamed peak of 1268 feet elevation in section 12, T. 6 N., R. 4 W. on the Capell Valley U.S.G.S. map; (6) Then east-southeast in a straight line approximately 1.1 miles to the point where an unnamed tributary stream enters Milliken Creek, immediately south of the Milliken Reservoir in section 7, T. 6 N., R. 3 W.; (7) Then following the unnamed stream east-northeast approximately 0.5 miles to its source; (8) Then northeast in a straight line approximately 0.5 miles, through the highest point of an unnamed peak of 1846 feet elevation, to the 1600 foot contour line in the eastern portion of section 8, T. 6 N., R. 3 W.; (9) Then following the 1600 foot contour line generally north and west for approximately 10 miles, to the point of intersection with the boundary line between sections 12 and 13, T. 7 N., R. 4 W. on the Yountville U.S.G.S. map; (10) Then following the section boundary line west approximately 1.1 miles to the intersection with an unnamed, unimproved road; (11) Then northwest in a straight line approximately 0.7 miles to the highest point of an unnamed peak of 2114 feet elevation, located in section 10, T. N., R. 4 W.; (12) Then northwest in a straight line approximately 0.7 miles to the highest point of an unnamed peak of 2023 feet elevation, located in section 10, T. N., R. 4 W.; (13) Then southwest in a straight line approximately 2.2 miles to Haystack (peak), the point of beginning.