Napa County
County
Heat class IV · 1991-2020 normals
Climate normals in three numbers
, Apr 1 – Oct 31
162 GridMET cells cover this region
season rain, Apr 1 – Oct 31
41 mm of it in the , Sep 1 – Oct 31
Warm and cool vintages since 1980
loading vintages…
Rain across the season, and at harvest
loading vintages…
The boundary
Hovering a shaded region names it; a click opens its page.
Measured vineyard area
loading crop mapping…
Drought categories, year by year
loading drought monitor…
What's in the ground
6.4
pH, 1:1 water
12.6cm
, whole profile
92cm
to
Well drained
, dominant condition
Distribution across 262 · mean ◆, median │, p10–p90 bar
Dominant
- 19.5%
- 12.0%
- 8.4%
- 7.3%
- 7.2%
262 map units · soil described over 93.1% of the region’s area · 12.9% is water, rock outcrop or other non-soil · 80% of the described area has a restrictive layer within the profile.
Sand, silt and clay, against every other appellation
Loam
34% sand · 43% silt · 24% clay
Sandier than 13% 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 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
loading terrain…
Producers
A curated roster, not a census — only source-verified entries appear, 2772 published across the atlas.
The roster places a producer in the appellation it names, never in a county — a winery’s address is a street in an AVA, and filing it under the county would be a claim about which of an AVA’s counties it sits in. So this region has no roster of its own, and 81 producers are entered in the appellations within it:
Bearing acreage by variety
loading acreage…
Price per ton
loading crush report…