Napa Valley Vineyards (Rutherford) — Live Satellite Health Report

About this region

The Rutherford bench, on the Napa Valley floor, is one of California’s most prestigious Cabernet Sauvignon terroirs — a fan of alluvial gravel washed down from the Mayacamas mountains. The gravelly soils drain freely, forcing roots deep and producing the structured, age-worthy Cabs that made Napa famous. Cabernets from this stretch fetch some of the highest prices in American wine, and the “Rutherford dust” character is one of the most discussed terroir signatures in the New World.

Climate & growing cycle

Napa has a warm Mediterranean climate: dry sunny summers with large diurnal swings — cool nights from marine fog rolling in from San Pablo Bay. Most vineyards are drip-irrigated, though the best are dry-farmed once established. Cabernet Sauvignon buds in March–April, flowers in May, véraison in late July, and harvest falls in September–October. The canopy is dense and vertically shoot-positioned, maximising sun interception in the valley’s long, bright days.

Satellite monitoring insights

NDVI peaks high (0.5–0.7) at full canopy on Napa’s Cabernet — the combination of warm sun, drip irrigation, and managed canopy creates a vigorous signal. Drought and wildfire are the region’s defining threats: NDMI tracks irrigation performance and developing water stress during the dry summer, while NBR is a critical fire-risk index for the surrounding hills and vineyard margins. A falling NDMI in August signals inadequate irrigation during the final ripening push, directly affecting berry size and tannin maturity. The large diurnal temperature swing means Napa vines recover at night, producing a stable NDVI plateau through summer that is unusual in Mediterranean viticulture.

Key metrics

Index	Peak range	California-specific signal
NDVI	0.5–0.7	Dense, irrigated canopy — stable through summer
NDMI	−0.1 to 0.2	Irrigation performance during ripening
NBR	Varies	Fire risk in vineyard margins and hills

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