Best Time To Plant Cilantro In Oregon

Oregon’s mild, rainy springs provide ideal conditions for cilantro, but knowing the exact planting window prevents disappointment from unexpected frosts. The best time to plant cilantro in Oregon depends on your specific region and the weather patterns each year. This guide breaks down everything you need to know for a successful cilantro harvest.

Cilantro is a cool-season herb that bolts quickly in heat. Oregon’s climate offers two main planting windows: spring and fall. Spring planting gives you fresh leaves before summer heat arrives. Fall planting lets you enjoy cilantro well into winter in milder areas.

The absolute best time to plant cilantro in Oregon is from mid-March through early May for spring harvests. For fall harvests, plant from late August through mid-September. These windows work for most of the state, but microclimates matter.

In western Oregon, including Portland and the Willamette Valley, spring planting can start as early as mid-March. The soil is workable and temperatures are cool. In eastern Oregon, where winters are colder and springs come later, wait until April or early May.

Spring Planting Window Details

Spring planting gives you the longest harvest period. Cilantro grows best when daytime temperatures are between 50°F and 85°F. Oregon’s spring weather fits this perfectly.

Coastal areas (Astoria, Newport): Plant from mid-March to early May. Cool ocean air keeps plants happy longer.
Willamette Valley (Portland, Salem, Eugene): Plant from mid-March to late April. Soil warms quickly in these areas.
Southern Oregon (Medford, Ashland): Plant from late March to early May. Warmer springs mean earlier planting.
Eastern Oregon (Bend, Pendleton, La Grande): Plant from late April to mid-May. Frost risk is higher here.
High elevations (Mount Hood, Crater Lake area): Plant from mid-May to early June. Short growing season requires careful timing.

Check your local frost dates before planting. Cilantro can survive light frosts, but hard freezes kill it. Use a soil thermometer to ensure soil temperature is at least 50°F for best germination.

Fall Planting Window Details

Fall planting extends your cilantro season. In Oregon’s mild coastal and valley areas, cilantro can grow through November and sometimes December.

Coastal areas: Plant from late August to mid-September. Harvest through November.
Willamette Valley: Plant from late August to early September. Harvest until first hard frost.
Southern Oregon: Plant from early September to late September. Warmer fall temperatures allow later planting.
Eastern Oregon: Fall planting is risky. Frost comes early. Try planting in late July for a fall harvest instead.

Fall-planted cilantro grows slower due to decreasing daylight. But the flavor is often stronger and the plants are less likely to bolt quickly.

Factors That Affect Planting Time

Several factors influence when you should plant cilantro in Oregon. Understanding these helps you adjust for your specific garden.

Frost Dates

Oregon’s frost dates vary widely. The last spring frost ranges from late March in Portland to late May in Bend. The first fall frost ranges from early October in eastern Oregon to late November on the coast.

Check your zip code’s average frost dates online. Plant cilantro 2-4 weeks before the last spring frost for spring crops. For fall crops, plant 6-8 weeks before the first fall frost.

Soil Temperature

Cilantro seeds germinate best when soil temperature is between 55°F and 68°F. In cold soil, seeds rot or germinate slowly. Use a soil thermometer to check.

In western Oregon, soil reaches 50°F by mid-March most years. In eastern Oregon, soil may not warm up until late April. You can warm soil by covering it with black plastic for a week before planting.

Rainfall Patterns

Oregon’s rainy springs are perfect for cilantro. The herb needs consistent moisture to grow well. But too much rain can cause fungal issues.

In western Oregon, spring rains are reliable. You rarely need to water cilantro after planting. In eastern Oregon, springs are drier. You’ll need to water regularly, especially during dry spells.

Day Length

Cilantro is sensitive to day length. Long days trigger bolting (going to seed). In Oregon, days get long quickly after the spring equinox. This is why spring-planted cilantro bolts by June.

Fall planting avoids long days. Days are getting shorter, so cilantro stays leafy longer. This is a key reason fall planting can be more productive.

How To Plant Cilantro In Oregon

Planting cilantro correctly ensures good germination and strong growth. Follow these steps for best results.

Step 1: Choose The Right Location

Cilantro needs full sun to partial shade. In Oregon’s cloudy springs, full sun is best. In hot summers, afternoon shade helps prevent bolting.

Choose a spot with well-draining soil. Cilantro hates wet feet. Raised beds work well in Oregon’s rainy areas. Containers are also great for controlling moisture.

Step 2: Prepare The Soil

Cilantro prefers loose, fertile soil with a pH between 6.2 and 6.8. Oregon soils are often acidic, so you may need to add lime.

Remove weeds and rocks from the planting area.
Mix in 2-3 inches of compost or well-rotted manure.
Add a balanced fertilizer (10-10-10) according to package directions.
Rake the soil smooth and water it lightly.

Step 3: Sow Seeds Directly

Cilantro does not transplant well. Always sow seeds directly in the garden. Seeds are small, so plant them shallowly.

Make shallow furrows about 1/4 inch deep.
Space seeds about 1 inch apart in rows 12-18 inches apart.
Cover seeds lightly with soil and pat down gently.
Water gently with a fine spray to avoid washing seeds away.
Keep soil consistently moist until seeds germinate (7-14 days).

Step 4: Thin Seedlings

Once seedlings have 2-3 true leaves, thin them to 6-8 inches apart. Thinning prevents overcrowding and improves air circulation.

You can eat the thinned seedlings. They taste like mild cilantro and are great in salads.

Step 5: Mulch And Water

Apply a thin layer of straw or grass clippings around plants. Mulch keeps soil cool and moist, which delays bolting.

Water deeply once a week if rain is scarce. In Oregon’s wet springs, you may not need to water at all. Check soil moisture by sticking your finger an inch into the soil.

Regional Planting Guides For Oregon

Oregon has diverse climates. Here are detailed guides for each major region.

Western Oregon (Portland, Salem, Eugene, Corvallis)

This region has mild, wet winters and warm, dry summers. Cilantro grows well here with proper timing.

Spring planting: Mid-March to late April. Soil warms quickly. Plant in full sun. Harvest from May to June.

Fall planting: Late August to mid-September. Plant in partial shade to avoid heat stress. Harvest from October to November.

Winter planting: In mild winters, you can plant in October in a cold frame or greenhouse. Harvest through winter.

Coastal Oregon (Astoria, Newport, Coos Bay)

The coast has cool, foggy summers and mild winters. Cilantro thrives here because heat is rare.

Spring planting: Mid-March to early May. Cool temperatures mean slower growth but longer harvest. Harvest from May to July.

Fall planting: Late August to late September. Mild fall weather allows growth into December. Harvest from October to December.

Year-round planting: In protected spots, you can plant cilantro almost year-round. Use row covers for frost protection.

Southern Oregon (Medford, Ashland, Grants Pass)

This region has hot, dry summers and mild winters. Cilantro needs careful timing to avoid heat.

Spring planting: Late March to early May. Plant early to harvest before June heat. Harvest from May to June.

Fall planting: Early September to late September. Fall temperatures are ideal. Harvest from October to November.

Summer planting: Not recommended. Heat causes immediate bolting. If you try, plant in deep shade and water heavily.

Eastern Oregon (Bend, Pendleton, La Grande)

This region has cold winters, short springs, and hot summers. Cilantro has a narrow planting window.

Spring planting: Late April to mid-May. Wait until frost risk passes. Harvest from June to July.

Fall planting: Late July to early August. Plant for a fall harvest before first frost. Harvest from September to October.

Summer planting: Not recommended. Heat and dry conditions stress plants. Focus on spring and fall crops.

High Elevations (Mount Hood, Crater Lake, Wallowas)

These areas have very short growing seasons. Cilantro is possible but challenging.

Spring planting: Mid-May to early June. Soil warms late. Use black plastic to warm soil. Harvest from July to August.

Fall planting: Not recommended. First frost comes early. Plant a second spring crop instead.

Container growing: Grow cilantro in containers that you can move indoors during cold snaps. This extends the season significantly.

Common Cilantro Growing Problems In Oregon

Even with perfect timing, problems can occur. Here are solutions to common issues.

Bolting Too Quickly

Cilantro bolts when temperatures rise above 85°F or days get long. In Oregon, this happens in June.

Plant early in spring or in fall to avoid heat.
Provide afternoon shade in warmer areas.
Harvest leaves regularly to delay bolting.
Cut flower stalks as soon as they appear.

Poor Germination

Cilantro seeds can be slow to germinate. Common causes include cold soil, dry soil, or old seeds.

Soak seeds in water for 24 hours before planting.
Keep soil consistently moist.
Use fresh seeds each year.
Plant in warm soil (above 55°F).

Pests

Aphids and spider mites sometimes attack cilantro. In Oregon, aphids are more common in spring.

Spray plants with a strong stream of water to dislodge aphids.
Use insecticidal soap for severe infestations.
Attract beneficial insects like ladybugs with companion plants.

Diseases

Fungal diseases like powdery mildew can occur in wet conditions. Oregon’s rainy springs increase risk.

Space plants for good air circulation.
Water at soil level, not on leaves.
Remove infected leaves immediately.
Apply neem oil as a preventive spray.

Harvesting Cilantro For Best Flavor

Harvesting correctly maximizes your yield. Cilantro leaves are best when young and tender.

When To Harvest

Start harvesting when plants are 4-6 inches tall. This is usually 3-4 weeks after planting. Harvest in the morning when leaves are most flavorful.

Cut outer leaves first, leaving the inner rosette to grow. This method gives you multiple harvests from each plant.

How To Harvest

Use sharp scissors or pruning shears. Cut stems about 1-2 inches above the soil line. Avoid pulling leaves, which can damage the plant.

Harvest no more than one-third of the plant at a time. This ensures the plant can recover and produce more leaves.

Storing Fresh Cilantro

Fresh cilantro lasts about a week in the refrigerator. Store it properly to extend its life.

Place stems in a glass of water, like flowers.
Cover leaves loosely with a plastic bag.
Change water every 2-3 days.
Alternatively, wrap leaves in damp paper towels and store in a sealed bag.

Preserving Cilantro

If you have a surplus, preserve cilantro for later use. Freezing works best for flavor.

Freeze whole leaves in ice cube trays with water or oil.
Blend cilantro with olive oil and freeze in small containers.
Dry cilantro in a dehydrator or oven on low heat.

Companion Planting With Cilantro

Cilantro benefits from certain companions. It also helps other plants by attracting beneficial insects.

Good Companions

Plant cilantro near these vegetables and herbs for mutual benefits.

Tomatoes: Cilantro repels tomato hornworms.
Spinach: Both enjoy cool weather and similar conditions.
Lettuce: Cilantro provides light shade for lettuce.
Dill: Both attract pollinators and beneficial insects.
Basil: They grow well together in containers.

Bad Companions

Avoid planting cilantro near these plants.

Fennel: It inhibits growth of nearby plants.
Carrots: They compete for nutrients and can cross-pollinate.
Parsnips: Similar issues as carrots.

Frequently Asked Questions

Q: Can I plant cilantro in Oregon in the summer?

A: Summer planting is not recommended in most of Oregon. Heat causes cilantro to bolt quickly. If you must plant in summer, choose a shady spot and keep soil consistently moist. You may get a few weeks of harvest before bolting.

Q: What is the latest I can plant cilantro in Oregon for a fall harvest?

A: In western Oregon, you can plant as late as mid-September. In coastal areas, late September works. In eastern Oregon, plant by early August. Check your first frost date and count back 6-8 weeks.

Q: Does cilantro grow back after cutting in Oregon?

A: Yes, if you cut only the outer leaves and leave the center rosette intact. Each plant can produce 3-4 harvests before bolting. In fall, growth is slower but plants can produce for 6-8 weeks.

Q: Can I grow cilantro indoors in Oregon during winter?

A: Yes, cilantro grows well indoors on a sunny windowsill. Use a pot with drainage holes and quality potting soil. Provide 6-8 hours of light daily. Indoor cilantro grows slower but can provide fresh leaves all winter.

Q: Why is my cilantro turning yellow in Oregon?

A: Yellowing leaves often indicate overwatering or poor drainage. Oregon’s rainy springs can cause this. Check soil drainage and reduce watering. Yellowing can also mean nitrogen deficiency. Apply a balanced fertilizer if needed.

Final Tips For Success

Planting cilantro in Oregon is straightforward once you understand your local climate. Start with the right timing for your region. Use fresh seeds and keep soil moist during germination.

Harvest regularly to encourage bushier growth. Don’t let plants flower unless you want coriander seeds. If you miss the spring window, fall planting is an excellent backup.

Experiment with different planting dates in your garden. Keep notes on what works best. Over time, you’ll develop a personalized planting schedule that maximizes your cilantro harvest.

Remember that Oregon’s weather varies year to year. A warm spring allows earlier planting. A cold spring means waiting longer. Always check soil temperature and frost forecasts before planting.

With the right timing and care, you can enjoy fresh cilantro from your Oregon garden for months. Start with the spring planting window for the most reliable results. Add fall planting for an extended season. Your garden will reward you with abundant, flavorful leaves.