Washington State’s maritime climate supports garlic planting from October through December. Knowing exactly when to plant garlic in washington state is the key to a successful harvest, as timing affects bulb size and quality. Whether you’re a seasoned gardener or a beginner, this guide will help you choose the right planting window for your region.
Garlic needs a cold period to develop properly. In Washington, the mild fall and winter months provide ideal conditions for root growth before the ground freezes. Plant too early, and you risk disease; plant too late, and the bulbs may not mature.
Let’s break down the best planting times for different areas of Washington, from the wet coastal zones to the drier eastern regions.
When To Plant Garlic In Washington State
This is the core question every Washington gardener asks. The answer depends on your specific location within the state, but the general rule is to plant garlic 4 to 6 weeks before the ground freezes. For most of Washington, that means October through November.
In western Washington, where winters are milder, you can plant as late as December. In eastern Washington, where frost arrives earlier, aim for late September to mid-October. The goal is to give the garlic time to establish roots without sending up green shoots before winter.
Regional Breakdown For Washington State
Washington is divided into distinct climate zones. Here’s how to adjust your planting schedule:
- Western Washington (Seattle, Tacoma, Olympia): Plant from mid-October to early December. The mild, wet winters allow for later planting. Soil temperatures should be below 60°F but above 40°F.
- Eastern Washington (Spokane, Yakima, Tri-Cities): Plant from late September to mid-October. Cold winters arrive earlier, so get bulbs in the ground before the first hard freeze.
- Coastal Areas (Port Angeles, Aberdeen): Plant from October to November. Ocean influence keeps temperatures moderate, but heavy rain can cause rot, so ensure good drainage.
- Mountain Foothills (Leavenworth, Winthrop): Plant in September. Higher elevations have shorter growing seasons, so early planting is critical.
Why Timing Matters So Much
Garlic is a biennial plant that requires a cold period to trigger bulb formation. If you plant too early in fall, the garlic may sprout leaves that get damaged by frost. If you plant too late, the roots won’t develop enough to survive winter, leading to small bulbs or rot.
The ideal soil temperature for planting is between 50°F and 60°F. At these temperatures, roots grow quickly but shoots stay dormant. In Washington, this window typically opens in October and closes by December in most areas.
Choosing The Right Garlic Variety For Washington
Not all garlic grows well in Washington’s climate. You need varieties that can handle wet winters (in the west) or cold, dry winters (in the east). Here are the best options:
Softneck Garlic
Softneck varieties are common in grocery stores. They have flexible stems and store well. In Washington, they perform best in the warmer, drier eastern regions. Popular choices include:
- California Early
- Inchelium Red
- Silver White
Hardneck Garlic
Hardneck varieties produce a flower stalk (scape) and have larger, more flavorful cloves. They are better suited for western Washington’s cooler, wetter climate. Top picks include:
- Music
- German Red
- Purple Stripe
- Rocambole (like Spanish Roja)
Elephant Garlic
This is actually a type of leek, but it grows like garlic. It needs a long growing season and does well in western Washington if planted early. Plant in October for best results.
Step-By-Step Guide To Planting Garlic In Washington
Follow these steps to ensure a bountiful harvest next summer. Timing is just one part of the equation; proper planting technique matters too.
Step 1: Prepare The Soil
Garlic needs loose, well-draining soil rich in organic matter. In Washington’s heavy clay soils (common in the west), add compost or aged manure to improve drainage. Test the soil pH; garlic prefers a range of 6.0 to 7.0.
Remove weeds and rocks. Work the soil to a depth of 8 to 10 inches. If you have heavy rain, consider raised beds to prevent waterlogging.
Step 2: Break Apart Bulbs
Separate the garlic bulb into individual cloves just before planting. Leave the papery skin on each clove. Choose the largest cloves for planting, as they produce the biggest bulbs. Small cloves can be used for cooking.
Step 3: Plant The Cloves
Plant each clove with the pointed end facing up. The flat end (where the roots emerge) should be down. Plant cloves 2 inches deep, measured from the tip of the clove to the soil surface. In colder areas of eastern Washington, plant 3 to 4 inches deep for extra frost protection.
Space cloves 6 inches apart in rows that are 12 inches apart. This gives each plant enough room to grow.
Step 4: Water And Mulch
After planting, water the bed thoroughly. Then apply a thick layer of mulch—straw, leaves, or wood chips—to insulate the soil and suppress weeds. In western Washington, 3 to 4 inches of mulch is enough. In eastern Washington, use 6 inches for extra cold protection.
Mulch also helps regulate soil temperature and moisture, which is critical during Washington’s wet winters.
Step 5: Wait For Spring
Garlic will grow roots through fall and winter. In early spring, green shoots will emerge. Remove some mulch once the weather warms to allow the soil to heat up. Keep the bed watered evenly, but not soggy.
Common Mistakes To Avoid
Even experienced gardeners make errors with garlic timing. Here are pitfalls specific to Washington’s climate:
- Planting too early: If you plant in September in western Washington, warm soil may cause premature sprouting. The shoots then get killed by frost.
- Planting too late: In eastern Washington, planting after mid-October means roots won’t establish before the ground freezes. Bulbs will be small.
- Using grocery store garlic: Many store-bought bulbs are treated to prevent sprouting. They may also carry diseases. Always buy seed garlic from a reputable source.
- Ignoring drainage: Washington’s fall rains can rot garlic if the soil stays wet. Add sand or compost to heavy clay soils.
Harvesting And Storing Garlic In Washington
Knowing when to plant is only half the story. You also need to know when to harvest. In Washington, garlic is typically ready in mid-to-late summer, depending on the variety and planting time.
Signs Your Garlic Is Ready
Look for these indicators:
- The lower leaves turn brown and dry, but the upper leaves remain green.
- The stem softens and bends over.
- Bulbs are fully formed and the cloves are distinct.
Harvest on a dry day. Gently dig up the bulbs with a garden fork, being careful not to bruise them. Do not pull the stems, as they may break.
Curing Garlic
After harvest, cure the garlic in a warm, dry, well-ventilated area for 2 to 4 weeks. Hang them in bundles or lay them on a screen. Once the outer skins are papery and the roots are dry, trim the stems and roots.
Store cured garlic in a cool, dark place with good air circulation. In Washington’s humid climate, a basement or garage works well. Properly stored garlic can last 6 to 8 months.
Frequently Asked Questions
Can I plant garlic in spring in Washington?
Yes, but it’s not ideal. Spring-planted garlic often produces smaller bulbs because it misses the cold period needed for proper development. If you must plant in spring, do so as soon as the soil is workable (March or April) and choose softneck varieties that mature faster.
What happens if I plant garlic too late in Washington?
If you plant after the ground freezes, the cloves may rot or produce weak plants. In western Washington, late December planting can still work if the soil isn’t frozen, but expect smaller yields. In eastern Washington, late planting usually fails.
Should I water garlic in winter in Washington?
Generally no. Washington’s winter rains provide enough moisture. Overwatering can cause rot. Only water if you have an unusually dry fall and the soil is dry at planting time.
Can I grow garlic in containers in Washington?
Yes, but choose a deep container (at least 12 inches) with drainage holes. Use potting soil mixed with compost. Place the container in a sunny spot and protect it from heavy rain. Container garlic may need more frequent watering in spring.
How do I protect garlic from Washington’s heavy rain?
Plant in raised beds or mounds to improve drainage. Add a layer of gravel or sand at the bottom of planting holes. Avoid over-mulching in wet areas, as thick mulch can trap moisture.
Final Tips For Washington Garlic Growers
Garlic is a rewarding crop that requires minimal effort once planted. The key is getting the timing right. Remember: western Washington allows later planting, while eastern Washington demands earlier action.
Keep a garden journal to track your planting dates and results. Over time, you’ll learn the perfect window for your specific microclimate. Don’t be afraid to experiment with different varieties to see what thrives in your soil.
One more thing: garlic is a heavy feeder. In spring, apply a balanced fertilizer or compost tea to boost growth. Stop fertilizing once the leaves start to yellow, which signals the bulbs are maturing.
With proper timing and care, you’ll enjoy homegrown garlic that beats anything from the store. Start planning your fall planting now, and you’ll be rewarded with a bountiful harvest next summer.
If you’re still unsure about your local conditions, ask fellow gardeners at a community garden or check with your county extension office. They can provide specific advice for your area. Happy planting!