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Facts on the



Latitude 46° N, Longitude 118.5° W

In France, latitude 46°N lies midway between Bordeaux and Burgundy.

Area of AVA:

1306 km2 = 504 mi2 = 322794 acres = 130630 hectares

2,836 acres of planted vineyards in the Walla Walla Valley AVA

43% in Oregon, 57% in Washington

Maximum elevation: 2000 ft (610 m)
Minimum elevation: 400 ft (122 m)
Median elevation: 990 ft (302 m)


Average Growing Season (April 1 - October 31) temperature
Cool sites: 60° F (15.5°C)
Warm sites: 66° F (18.9°C)
Average for AVA: 63° F (17.2°C)

Average Growing Degree-Days 50° F (10°C)
Cool sites: 2650 (1472)
Warm sites: 2900 (1611)
Average for AVA: 2800 (1556)

Average precipitation
Minimum on west (dry) side of AVA: 7 in (17.8 cm)
Maximum on east (wet) side of AVA: 22 in (55.9 cm)
Average for AVA: 15 in (38.1 cm)

Maximum hours of daylight: 15:46 (summer solstice)
Average hours of daylight during growing season: 13:52

Average number of frost-free days: 215
On average, last frost occurs during the last week of March
On average, first frost occurs during the last week of October


Bedrock is Basalt (dark volcanic rock) of Miocene age (15 million years)

Below 1200 ft. (valley floor), bedrock is overlain by (in order) ancient gravels, Missoula flood sediments (silt, sand, and gravel), and wind-deposited silt (loess). Above 1200 ft. (foothills) bedrock is overlain by loess of varying thickness


Four distinct soil terroirs

1) Soil type: Wind-deposited silt (loess) overlying Missoula flood sediments
Location: Valley floor
Representative soil series: Ellisforde silt loam
Example vineyards: Pepperbridge, Birch Creek, Lower Seven Hills, Windrow

2) Soil type: Thick wind-deposited silt (loess) overlying basalt bedrock
Location: Foothills
Representative soil series: Walla Walla silt loam
Example vineyards: Les Collines, Leonetti Loess, Spring Valley, Sevein

3) Soil type: Basalt cobblestone gravels
Location: floodplains of Walla Walla River and Mill Creek near cities of Milton-Freewater and Walla Walla
Representative soil series: Freewater very cobbly loam
Example Vineyards: Cayuse Armada, Zerba Winesap, Waliser Yellowjacket,

4) Soil type: Very thin wind-deposited silt (loess) on basalt bedrock
Location: Steep slopes in foothills and canyons
Representative soil series: Lickskillet very stony loam