Pacific Northwest Gardening Calendar (Zone 8a–8b)
How to Use the Garden Calendar
Gardening in the Pacific Northwest follows a rhythm shaped by cool springs, long stretches of rain, and soil that warms slowly in early season. What works in other parts of the country often runs weeks ahead of us here.
This calendar is designed specifically for Pacific Northwest gardens — especially Zone 8a and 8b — where timing matters more than dates on a seed packet. Instead of rigid planting charts, you’ll find seasonal cues, soil temperature awareness, and practical monthly guidance based on real regional conditions.
Use it as a reference point throughout the year. Conditions shift, but the rhythm stays consistent.
May
The big plant-out. Warmth arrives in bursts—be bold, but keep a blanket nearby.
Plant
- Beans, corn (once soil is warm)
- Tomatoes & peppers (after nights reliably ~50°F)
- Cucumbers, squash, pumpkins
- Dahlia tubers
- Bedding annuals + pollinator plants
Do
- Stake tomatoes immediately
- Mulch heavily to prep for summer dryness
- Set up drip/soaker hoses early
- Thin fruit tree crops if they are overloaded
Watch
- Slugs + earwigs on fresh transplants
- Spittlebugs (bubbles on stems—harmless, just spray with water)
- Cold nights and wind
Indoors / Protected
- Start: flowers for summer succession (zinnias/cosmos)
Related reads
A few more posts that pair well with this one.
PNW Frost Dates (A Gentle Guide)
→Confused by frost dates in the Pacific Northwest? This gentle guide explains PNW first and last frost, microclimates, and what to plant when.
When to Prune Roses in the Pacific Northwest (Zone 8 Guide)
→Wondering when to prune roses in Washington State? Here’s exactly when to prune roses in the Pacific Northwest — how to know it’s time, and how to prune with confidence.
What to Plant in March in Washington State (PNW Gardening Guide)
→Wondering what to plant in March in Washington State? A practical Pacific Northwest gardening guide covering vegetables, flowers, herbs, and trees you can plant now — indoors and out.
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