When to Plant Garlic in Washington (2026 Guide)
Garlic is a beloved crop for many home gardeners in Washington, prized for its robust flavor and ease of cultivation. This unique plant can be planted as the summer crops are harvested, allowing you to make full use of your garden space. By knowing the local frost dates—such as April 9 for Zone 6b and May 6 for Zone 5b—you can effectively time your planting for optimal growth.
In Washington, the timing for planting garlic varies by hardiness zone. Gardeners in the milder Zone 6b can start planting in early October, while those in the cooler Zone 5b should wait until later in the fall. This guide will give you the precise details needed to successfully plant garlic in your specific region, whether you are in Seattle or Spokane.
Garlic has a long growing season, typically taking 8–9 months to mature, making it important to adhere to local frost dates for planting and harvesting. The ability of garlic to thrive in Washington’s unique climate conditions means that it can provide a rewarding yield with minimal effort. Let’s delve into the specific planting times and care requirements based on your hardiness zone.
Planting Schedule by USDA Zone in Washington
| Zone | Indoor start | Transplant out | Direct sow | Harvest |
|---|---|---|---|---|
| Zone 6b | Start February 15 – March 1, ~6–8 weeks before April 10 | Transplant outdoors from mid-October to late October, after October 26 | N/A | Harvest from late June to early August, ideally when 60–70% of leaves are yellowed |
| Zone 6a | Start February 20 – March 5, ~6–8 weeks before April 20 | Transplant outdoors from mid-October to late October, after October 19 | N/A | Harvest from late June to early August, looking for 60–70% yellowed lower leaves |
| Zone 5b | Start March 1 – March 15, ~6–8 weeks before May 6 | Transplant outdoors from late October to early November, after May 6 | N/A | Harvest from late July to mid-August, when lower leaves are mostly yellowed |
Garlic Planting Windows in Washington
- Indoor start: Start your garlic cloves indoors between February 15 and March 15, depending on your zone.
- Transplant outdoors: Transplant your garlic outdoors from mid-October to early November, aligning with your zone's last frost date.
- Harvest: Harvest your garlic from late June to mid-August when about 60–70% of lower leaves have turned yellow.
Common Mistakes Growing Garlic in Washington
- One common mistake in Washington gardens is planting garlic too late in the autumn, especially in the colder areas. Waiting too long can subject your garlic bulbs to frost damage before the winter sets in, leading to poor growth.
- Excessive watering is another pitfall for Washington gardeners. The state's variable rainfall patterns, especially in spring, can lead to waterlogged soil that fosters disease and bulb rot if the garlic bed isn’t well-draining.
- Garlic grown in Washington may suffer if not properly selected for the locality. Using weak or small cloves from a grocery store can lead to disappointing yields. It’s crucial to use locally sourced or certified garlic varieties for better adaptation.
- Neglecting to harvest garlic at the right time is a frequent issue. Garlic that is left in the ground too long can become overripe, leading to deteriorating wrappers which shorten storage life—be attentive during the harvest window!
- Many gardeners in Washington forget about the importance of curing garlic after harvest. If not done properly, freshly harvested garlic can rot or sprout prematurely, ruining your kitchen supply.
Frequently Asked Questions
What if I’m in a cold pocket of Washington?
If you reside in a colder area, ensure you’re using hardneck garlic varieties that can withstand lower temperatures. Start your garlic indoors in late winter and plant it outdoors after the first frost passes, following local frost dates closely.
Can I still plant garlic in May?
Planting garlic in May is generally too late for optimal growth in most parts of Washington, especially since garlic needs time to establish roots before summer. Aim for late October to early November for the best results.
How should I care for my garlic during the growing season?
Caring for garlic involves monitoring soil moisture and avoiding overwatering. Inducing mulch can help retain moisture and suppress weeds. Pay attention to pests and diseases, taking action promptly to protect your plants.
Is garlic frost-sensitive?
Garlic is somewhat frost-tolerant, especially when it is planted in the fall. It can survive colder temperatures once established, but young shoots are vulnerable. Proper planting time and site selection are essential to guard against late frosts.
How do I know when to harvest garlic?
You’ll want to harvest garlic when 60–70% of its lower leaves have died back, but the upper leaves remain green. This typically occurs from late June to mid-August, depending on your specific hardiness zone.
Keep Learning
City guides in Washington
Other crops in Washington
Typical fall sowing window for Garlic in Washington: October 25 – November 15.