Herbs thrive when their planting aligns with their native growing conditions and seasonal light cycles. Knowing when to plant herbs is the single most important step for a successful harvest. Plant too early, and frost kills tender seedlings. Plant too late, and summer heat stunts growth before they mature.
This guide breaks down exactly when to sow each herb, whether you are starting from seed indoors or direct-sowing outside. You will learn the best months for your climate zone and how to read your local weather patterns.
When To Plant Herbs: The Core Timing Factors
Timing depends on three main things: your local frost dates, the herb’s temperature preference, and whether you use seeds or transplants. Herbs fall into two groups: cool-season and warm-season.
Cool-season herbs like parsley, cilantro, and dill prefer spring and fall. Warm-season herbs like basil, rosemary, and oregano need soil temperatures above 60°F (15°C).
Understanding Your Last Frost Date
Your last spring frost date is the key reference point. You can find it online by searching “last frost date [your city].” For most herbs, you plant after this date.
- Tender herbs (basil, marjoram): plant 1–2 weeks after last frost.
- Hardy herbs (chives, mint, thyme): plant 2–4 weeks before last frost.
- Half-hardy herbs (cilantro, dill): plant on or just after last frost.
Soil Temperature Matters More Than Air Temperature
Herb seeds germinate best when soil is warm enough. Use a soil thermometer. Basil needs 70°F (21°C). Parsley germinates at 50°F (10°C). Cold soil rots seeds.
Season-By-Season Guide For Planting Herbs
Each season offers different opportunities. Here is when to plant herbs in spring, summer, fall, and even winter in mild climates.
Spring Planting: The Main Event
Spring is the busiest time. Start seeds indoors 6–8 weeks before your last frost date. This gives plants a head start.
- Indoor seed starting: Use seed trays with drainage. Keep soil moist but not soggy.
- Hardening off: Gradually expose seedlings to outdoor conditions over 7–10 days.
- Direct sowing: Sow seeds like dill and cilantro directly in the garden after frost danger passes.
Common spring herbs: basil, chives, parsley, sage, oregano, thyme, mint, lavender.
Summer Planting: For Warm-Loving Herbs
Summer is for heat-lovers. If you missed spring, you can still plant in early summer. Basil, rosemary, and lemongrass thrive in hot weather.
Water deeply after planting. Mulch around plants to keep roots cool. Avoid planting in midday heat.
Fall Planting: Cool-Season Herbs Shine
Fall is perfect for cilantro, parsley, and dill. These herbs bolt (go to seed) in summer heat. Plant 6–8 weeks before your first fall frost.
In mild winter areas (zones 8–10), you can plant year-round. Herbs like rosemary and thyme survive light frosts.
Winter Planting: Only For Mild Climates
If you live in zones 9–11, winter is a great time for herbs. Plant cilantro, parsley, and chives. Protect tender plants with row covers if frost threatens.
Herb-By-Herb Planting Calendar
Here is a detailed breakdown for 12 popular herbs. Each entry includes the best time to plant and special tips.
Basil
Plant after all frost danger. Soil must be at least 70°F. Start indoors 6 weeks before last frost. Direct sow in warm soil. Basil hates cold.
Chives
Plant 4–6 weeks before last frost. They tolerate cold. Start indoors 8 weeks before last frost. Divide clumps in spring.
Cilantro
Direct sow in early spring or fall. Cilantro bolts quickly in heat. Succession plant every 2–3 weeks for continuous harvest.
Dill
Direct sow in spring after frost. Dill does not transplant well. Sow every 3 weeks for steady supply. It self-seeds easily.
Mint
Plant in spring after last frost. Mint is invasive. Use containers. Start from cuttings or transplants, not seeds.
Oregano
Plant in spring after last frost. Start indoors 6–8 weeks before. Oregano is drought-tolerant once established.
Parsley
Soak seeds overnight before planting. Sow indoors 8–10 weeks before last frost. Direct sow in early spring. Slow to germinate.
Rosemary
Plant in spring after frost. Rosemary needs full sun and well-drained soil. Start from cuttings or transplants. Seeds are slow.
Sage
Plant in spring after last frost. Start indoors 6–8 weeks before. Sage prefers dry soil. Do not overwater.
Thyme
Plant in spring after frost. Start indoors 8–10 weeks before. Thyme loves poor soil. Do not fertilize heavily.
Lavender
Plant in spring after frost. Lavender needs sandy, alkaline soil. Start indoors 10–12 weeks before. Be patient—it grows slowly.
Lemongrass
Plant in late spring after soil warms. Lemongrass is tropical. Start indoors 8 weeks before. Grow in containers in cold climates.
Indoor Seed Starting Timeline
Starting seeds indoors gives you control. Here is a timeline based on your last frost date.
| Herb | Weeks Before Last Frost | Notes |
|---|---|---|
| Basil | 6 | Warm soil needed |
| Chives | 8 | Cold tolerant |
| Parsley | 8–10 | Soak seeds first |
| Oregano | 6–8 | Light needed for germination |
| Sage | 6–8 | Keep soil warm |
| Thyme | 8–10 | Slow germinator |
| Lavender | 10–12 | Cold stratify seeds |
Direct Sowing: When To Plant Herbs Outside
Some herbs do better when sown directly in the garden. Here is when to direct sow.
- Cilantro: Early spring or late summer.
- Dill: Spring after frost, or fall in mild areas.
- Parsley: Early spring, but germination is slow.
- Chives: Early spring, they handle cold.
- Mint: Spring, but use containers.
Direct sowing is simpler. No transplant shock. But you must wait for proper soil temperature.
Climate Zone Adjustments
Your USDA hardiness zone changes when to plant. Here are general guidelines.
Zones 3–5 (Cold Winters)
Short growing season. Start seeds indoors early. Plant after last frost in late May or early June. Use season extenders like cloches.
Zones 6–7 (Moderate Winters)
Plant cool-season herbs in early spring. Warm-season herbs after last frost (April–May). Fall planting possible in September.
Zones 8–10 (Mild Winters)
Plant year-round. Cool-season herbs in fall and winter. Warm-season herbs in spring and summer. Protect from intense heat.
Zones 11–13 (Tropical)
Plant during cooler months. Avoid hot, humid summers. Herbs like basil and mint grow well in partial shade.
Common Mistakes With Herb Planting Timing
Even experienced gardeners make errors. Here are the most common.
- Planting too early: Cold soil kills seeds. Wait for proper temperatures.
- Planting too late: Heat stress stunts growth. Herbs bolt quickly.
- Ignoring microclimates: Your garden may be warmer or colder than the general zone.
- Overwatering after planting: Seeds rot in wet soil. Water lightly.
- Not hardening off: Indoor plants need gradual exposure to sun and wind.
Tools To Help You Time Your Planting
Use these tools to get the timing right.
- Soil thermometer: Essential for accuracy.
- Frost date calculator: Online tools for your zip code.
- Garden journal: Record planting dates and weather.
- Seed packet instructions: Always read the back.
- Local extension office: Free advice for your area.
Succession Planting For Continuous Harvest
Plant small batches every 2–3 weeks. This ensures you always have fresh herbs. Cilantro, dill, and basil respond well to succession planting.
Example schedule for cilantro:
- Plant first batch in early spring.
- Plant second batch 3 weeks later.
- Plant third batch in late summer for fall harvest.
This method prevents gluts and gaps.
Transplanting: When To Move Herbs Outside
Transplants need careful timing. Move them outdoors after hardening off. Wait for nighttime temperatures above 50°F for tender herbs.
Hardy herbs like chives and mint can go out earlier. Check the weather forecast. Avoid planting before a cold snap.
Herb Planting By Moon Phase (Optional)
Some gardeners follow lunar cycles. Plant above-ground herbs during the waxing moon. Plant root herbs during the waning moon. This is not scientific but some swear by it.
Frequently Asked Questions
What Is The Best Month To Plant Herbs?
For most regions, April and May are best for warm-season herbs. March and September work for cool-season herbs. Check your local frost dates.
Can I Plant Herbs In The Summer?
Yes, but choose heat-tolerant herbs like basil, rosemary, and lemongrass. Plant in early summer. Provide shade and water.
Is It Too Late To Plant Herbs In July?
Not if you live in zones 6–10. Focus on fast-growing herbs like basil and cilantro. Use transplants for quicker harvest.
How Do I Know When To Plant Herbs From Seed?
Read the seed packet. It tells you weeks before last frost. Use a soil thermometer. Seeds need specific temperatures.
What Herbs Can I Plant In The Fall?
Cilantro, parsley, dill, chives, and mint. In mild climates, also rosemary and thyme. Plant 6–8 weeks before first frost.
Final Tips For Perfect Timing
Start small. Pick three herbs you use most. Learn their preferences. Keep a simple calendar. Adjust each year based on your experience.
Remember that local conditions vary. A neighbor’s garden may be warmer or cooler. Observe your own space. Soil, sun, and wind all affect timing.
With practice, you will know exactly when to plant herbs for a bountiful harvest. Your garden will reward you with fresh flavors all season long.