GrowZone

USDA hardiness zone by ZIP

USDA hardiness zone for ZIP 98101 (Seattle)

ZIP 98101 is USDA hardiness zone 9a; use the Seattle frost station's Mar 20 last frost and Nov 20 first frost to turn that zone into a planting calendar.

Source: seattle-tacoma frost station, USDA zone 9a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

ZIP 98101 is in USDA hardiness zone 9a. For vegetables, the zone is useful context, but frost dates decide the actual planting window.

Use the ZIP calendar to turn the zone into crop-specific dates.

Planting calendars in zone 9a

Seattle, WA · Zone 9a Tomatoes Mar 27 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Peppers Apr 3 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Basil Mar 30 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Carrots Feb 27 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Lettuce Mar 6 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Cucumbers Mar 30 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Zucchini Mar 30 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Cilantro Mar 6 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Bush beans Mar 27 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Spinach Feb 20 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Radishes Feb 20 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Kale Mar 6 Open answer · last frost Mar 20 Seattle, WA · Zone 9a Watermelon Apr 3 Open answer · last frost Mar 20