When to plant in Oregon
Oregon spans USDA hardiness zones 4a-9b. Average last spring frost: mid April (west) / late May (east). Average first fall frost: late October (west) / mid September (east). This calendar is anchored to Oregon State University Extension's recommendations, with timing adjusted for the dominant climate zone of the state.
Oregon at a glance
| USDA hardiness zones | 4a-9b |
| Region | Pacific Northwest |
| Average last spring frost | mid April (west) / late May (east) |
| Average first fall frost | late October (west) / mid September (east) |
| Primary Extension service | Oregon State University Extension |
What grows particularly well in Oregon
These are the crops, ornamentals, and trees Oregon State University Extension highlights as well-suited to Oregon's climate:
- blueberry
- hazelnut
- tomato
- lavender
- rhododendron
- Douglas fir
Oregon planting calendar
Dates are approximate and based on the dominant USDA zone for the state. For zone-specific timing, use the zone finder by ZIP code and frost date lookup tools.
Spring planting (after last frost: mid April (west) / late May (east))
Cool-season vegetables (start 2-6 weeks before last frost outdoors): lettuce, spinach, peas, radishes, carrots, beets, kale, broccoli transplants, cabbage transplants.
Warm-season vegetables (after last frost, soil 60F+): tomato transplants, pepper transplants, beans (direct sow), cucumbers, squash, melons. See the seed starting timeline tool for indoor start dates.
Annual flowers (after last frost): zinnia, marigold, cosmos, sunflower, nasturtium.
Perennials, shrubs, trees: Plant in spring after soil thaws but before summer heat. Best window in Oregon: 4-6 weeks after last frost.
Summer (June - August)
Maintenance season for most Oregon gardens. Mulch heavily, water deeply (1 inch per week), pinch back mums for fall bloom, hand-pull weeds, harvest summer vegetables. Plant fall vegetable starts indoors by mid-July.
Fall planting (before first frost: late October (west) / mid September (east))
Cool-season vegetables (6-8 weeks before first frost): lettuce, spinach, radish, kale, broccoli, cabbage transplants. Per Penn State Extension, fall vegetable production can equal or exceed spring production with proper timing.
Spring-flowering bulbs: tulip, daffodil, allium, crocus, hyacinth. Plant 4-6 weeks before ground freezes. In Oregon: typically October-November.
Perennials, shrubs, trees: Fall is the best planting season for woody plants in most of Oregon - cooler temperatures + autumn rains reduce transplant stress. Plant 6+ weeks before first hard freeze.
Garlic: Plant cloves in October-November. Harvest the following July.
Winter (December - February)
Most of Oregon is in dormancy. Tasks: order seeds, plan next year, dormant prune fruit trees (February), order bare-root plants for spring delivery. Avoid foot traffic on frozen lawns.
Common Oregon challenges
Wet winters/dry summers (Mediterranean climate west); high pressure for powdery mildew and rust; ravens and slugs; emerald ash borer (newly detected). For region-specific guidance, see our Pacific Northwest regional gardening guide.
Where to get Oregon-specific advice
The most reliable source for local growing advice is your county Extension office. Oregon State University Extension has county offices that provide free soil testing, plant disease diagnosis, and growing recommendations specific to your microclimate.
Visit Oregon State University Extension for the office nearest you.
Related tools and guides
- Find your USDA zone by ZIP code
- Look up your average frost dates
- Seasonal care calendar by zone
- Seed starting timeline calculator
- Pacific Northwest regional gardening guide