Planting calendar
May Planting Guide for Seattle, WA: Raised Beds, Containers & In-Ground Gardens
May in Seattle is ideal for planting warm-season vegetables and flowers in raised beds, containers, and in-ground gardens. With frost risk mostly passed, you can safely transplant seedlings and sow seeds directly outdoors. Focus on crops that thrive in mild, temperate conditions.
Plant now (quick list)
Tomatoes, Peppers, Zucchini, Bush beans, Cucumbers, Herbs (basil, parsley, cilantro), Lettuce, Spinach
Plant now
- Tomatoes
- Peppers
- Zucchini
- Bush beans
- Cucumbers
- Herbs (basil, parsley, cilantro)
- Lettuce
- Spinach
- Beets
- Carrots
Start indoors
- Winter squash
- Melons
- Eggplants
- Brussels sprouts
- Broccoli
- Cauliflower
- Cabbage
- Kale
Avoid
- Corn (wait until soil warms more)
- Potatoes (late planting reduces yield)
- Root crops in heavy clay soils
- Tender tropical plants without protection
- Direct sowing frost-sensitive seeds too early
Next 2 weeks
- Harden off indoor seedlings before transplanting
- Mulch raised beds to retain moisture
- Monitor for slugs and snails in containers
- Water consistently during dry spells
- Stake tall plants like tomatoes early
FAQs
Can I plant tomatoes directly in the ground in Seattle in May?
Yes, May is generally safe to transplant tomato seedlings outdoors after the last frost risk has passed.
Should I fertilize raised beds before planting?
Yes, apply a balanced organic fertilizer or compost to enrich soil before planting.
How often should I water container plants in May?
Water containers daily or when the top inch of soil feels dry, as they dry out faster than in-ground beds.
Is it too early to plant cucumbers in Seattle in May?
No, cucumbers can be sown directly or transplanted in May once soil temperatures are consistently above 60°F.
What vegetables should I avoid planting too early in May?
Avoid planting corn and potatoes too early as cooler soil temperatures can stunt growth.
Next steps
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