San Juan County, Washington

Local growing conditions for San Juan County: the USDA hardiness zones found here, frost dates, and live weather for communities across the county. Based on 9 ZIP codes in our data.

Hardiness zones in San Juan County

San Juan County spans these USDA plant hardiness zones (by number of ZIP codes):

Zone 8 (1) Zone 9 (8)

Local weather & frost dates

Open any community in San Juan County for its live forecast, frost dates, and planting calendar:

Anacortes 98222 Roche Harbor 98243 Roche Harbor 98245 Friday Harbor 98250 Friday Harbor 98261 Anacortes 98279 Friday Harbor 98280 Friday Harbor 98286 Roche Harbor 98297

More for Washington

Agriculture in Washington
Frost dates across Washington
USDA hardiness zones explained
Planting calendar by ZIP code

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County growing conditions are compiled from our ZIP-code database, USDA hardiness-zone data, and NOAA climate normals. Conditions vary within a county by elevation and local microclimate. Page updated Aug 4, 2026.