Planting calendar
May Planting Guide for Portland, OR: Raised Beds, Containers & In-Ground
May in Portland is ideal for planting warm-season vegetables and herbs in raised beds, containers, and in-ground gardens. You can safely transplant seedlings outdoors and sow heat-loving crops directly. Focus on tomatoes, peppers, beans, and herbs while continuing to care for early spring greens.
Plant now (quick list)
Tomatoes, Peppers, Green beans, Cucumbers, Basil, Zucchini, Eggplant, Summer squash
Plant now
- Tomatoes
- Peppers
- Green beans
- Cucumbers
- Basil
- Zucchini
- Eggplant
- Summer squash
Start indoors
- Winter squash
- Melons
- Late-season peppers
- Tomatillos
- Brussels sprouts
Avoid
- Leafy greens (slow to bolt but may struggle in heat)
- Peas (past optimal planting time)
- Cool-season root crops like radishes and carrots (may bolt)
- Broccoli (transplants may bolt)
- Potatoes (planting window closing)
Next 2 weeks
- Continue transplanting warm-season seedlings outdoors
- Mulch around plants to retain moisture
- Start succession planting beans and cucumbers
- Begin regular fertilization for heavy feeders
- Monitor for pests like aphids and caterpillars
FAQs
Can I plant tomatoes directly in the ground in May in Portland?
Yes, May is generally safe to transplant tomato seedlings outdoors after the last frost risk has passed.
Should I water raised beds differently than containers in May?
Containers dry out faster, so water them more frequently, while raised beds retain moisture better but still need regular watering.
Is it too late to plant peas in May in Portland?
Yes, peas prefer cooler weather and are best planted earlier in spring to avoid heat stress.
What are the benefits of using raised beds in Portland’s climate?
Raised beds improve drainage, warm soil faster in spring, and reduce soil compaction, benefiting root development.
How can I protect my container plants from late cold snaps?
Be prepared to cover containers with frost cloths or move them to sheltered spots if temperatures drop unexpectedly.
Next steps
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