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.
September
Second spring. Cooler nights return, and the garden becomes gentle again.
Plant
- Spinach, arugula, lettuce (great month for greens)
- Radishes and turnips
- Cover crops (crimson clover, vetch, rye—choose what fits your goals)
Do
- Harvest apples, pears, late berries; prune only if needed
- Clean up spent plants (especially anything diseased)
- Top-dress beds with compost and mulch as rains return
- Start planning garlic spots (sunny, well-drained)
Watch
- Slugs return with the rain
- Powdery mildew + rot on squash and cucumbers
- Early morning chill—protect basil if you want it to last
Indoors / Protected
- Start: overwintering greens in trays for protected beds
- Start: herbs to bring inside (cuttings can root now)
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.
What to Plant in June in Washington State (PNW Guide)
→A simple guide to what to plant in June in Washington State. Vegetables, flowers, herbs, and succession planting tips for Pacific Northwest gardens.
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.
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