How to Dry Herbs

Which herbs can you dry?

Most culinary and medicinal herbs dry successfully at home. Low-moisture herbs with woody stems — rosemary, thyme, oregano, lavender, sage — air-dry reliably in 1–2 weeks. High-moisture soft-stemmed herbs — basil, cilantro, chives — lose significant flavor when dried and are better preserved by freezing.

The difference comes down to moisture content and volatile oil composition. Low-moisture herbs have aromatic compounds that survive heat and time without degrading much. Their oil content is dense enough that dried leaves still deliver real flavor in cooking.

Basil is the exception most US gardeners discover through disappointment. Fresh basil has powerful, complex flavor. Dried basil from the store barely resembles the fresh herb. The volatile oil in basil (primarily linalool and eugenol) degrades rapidly during drying. Freezing basil in olive oil or as a paste preserves far more of its character.

Cilantro faces a similar issue. Dried cilantro loses most of the citrus-soap flavor profile that makes fresh cilantro distinctive. For preserving cilantro from a home garden, freezing is far more effective than drying. See our how to grow cilantro guide for harvest timing and which parts of the plant to harvest before the plant bolts.

When to harvest herbs for drying

Harvest herbs in the morning, after the dew dries and before midday heat. Harvest just before the plant flowers. Oil content in herb leaves reaches its peak at this stage.

The timing matters more than most gardeners realize. A rosemary branch harvested in full bloom has measurably lower essential oil concentration in the leaves than one harvested just before flower buds open. Once a plant flowers, it redirects energy from leaf oil production to seed production.

Practical harvest timing by herb:

• Rosemary: When flower buds form but before they open, typically spring in Zones 7–9 and early summer in Zones 5–6
• Thyme: Just before flowering; the plant sends up small pink flowers in late spring
• Oregano: When buds form; leaves are most flavorful at this stage
• Sage: In spring before the plant bolts; a second harvest is possible in fall
• Lavender: When 25–50% of flowers on each spike are open; harvest for culinary use at this stage, or for sachets at full bloom

For mint, harvest aggressively before the plant flowers — once mint flowers, leaf quality drops and the plant often dies back to the roots. See our mint plant care guide for keeping mint productive through the season.

Do not harvest more than one-third of the plant at one time. Heavy harvesting stresses the plant and reduces total seasonal yield. For perennial herbs like rosemary and thyme, a light harvest every 3–4 weeks through the growing season produces more total herb than one large harvest.

For lavender, timing affects both culinary quality and fragrance. Our lavender plant care guide covers harvest timing by use — culinary, fragrance, and cut flowers — and how to get two harvests per season in most US zones.

Air drying

Air drying is the simplest method and requires no equipment. Tie stems into small bundles of 4–6 stems and hang upside down in a warm, well-ventilated space away from direct light. Drying takes 1–3 weeks depending on herb moisture and humidity.

The key variables are airflow and humidity. Good airflow carries moisture away from drying herbs. Low humidity prevents mold from forming on the inside of herb bundles before outer stems are fully dry.

Air drying works reliably in:

• Low-humidity climates (Colorado, Arizona, Nevada, Utah) year-round
• Moderate-humidity climates (most of the US) in spring and fall
• Climate-controlled indoor spaces with air conditioning running

Air drying is unreliable in:

• High-humidity summer conditions (Southeast, Gulf Coast, Pacific Northwest, upper Midwest)
• Kitchens with steam from cooking nearby

How to air dry correctly:

1. Cut stems 4–6 inches long in the morning after dew dries
2. Remove any damaged or yellowing leaves
3. Tie 4–6 stems together loosely with twine — too tight restricts airflow
4. Hang upside down in a dry, warm spot with good ventilation (attic, spare bedroom, covered porch in dry weather)
5. If hanging in a dusty space, loosely bag each bundle in a paper bag with holes cut in the sides
6. Check weekly for mold; discard any bundle with gray or black spots
7. Remove when leaves crumble at a touch and stems snap cleanly — typically 1–3 weeks

Avoid hanging herbs in the kitchen over the stove. Steam and cooking oils contaminate the drying herbs and slow moisture loss. A spare bedroom, attic, or covered outdoor porch works better.

Oven drying

Oven drying takes 1–4 hours and works in any climate. Set the oven to 95–115°F and spread single layers of herb stems on baking sheets. Check every 30 minutes. Herbs are done when leaves crumble.

The biggest problem with oven drying is temperature. Most home ovens set to “warm” run at 170°F or higher. At that temperature, herbs dry quickly but lose essential oils and turn brown. The solution is an oven thermometer — the oven’s temperature display is often 10–30°F off from actual temperature.

Oven drying steps:

1. Preheat oven to its lowest setting (aim for 95–115°F; verify with an oven thermometer)
2. Spread herb stems or leaves in a single layer on a parchment-lined baking sheet
3. Leave the oven door slightly ajar to allow moisture to escape (prop it open with a wooden spoon)
4. Check every 30 minutes; stir or flip herbs for even drying
5. Total time: 1–4 hours depending on herb moisture content
6. Test for doneness: leaves should crumble between fingers; stems should snap

Herbs suitable for oven drying: all herbs, including high-moisture types like mint and basil if you accept some flavor loss. Basil dried at 95°F loses less flavor than basil dried at 170°F, but still less than frozen basil.

For harvesting rosemary and other perennial herbs before drying — including when to cut for maximum oil content — our rosemary plant care guide covers timing and technique for the US harvest season.

Food dehydrator drying

A food dehydrator gives the best temperature control for drying herbs. Set the temperature to 95–115°F and dry for 1–4 hours. The consistent airflow and precise temperature produce the highest-quality dried herbs.

Dehydrators designed for food preservation maintain temperature within 5°F of the set point — more precise than most home ovens. The fan-forced airflow evaporates moisture consistently from all parts of the tray at once, which reduces the risk of uneven drying or mold spots.

Dehydrator settings:

• Temperature: 95–115°F (most dehydrators label this as the “herbs” setting)
• Time: 1–4 hours; check at 1 hour and every 30 minutes after
• Loading: Single layer with space between stems for airflow

A basic 5-tray dehydrator (Presto, Nesco, or Excalibur entry models) is sufficient for home herb gardens. One load can process 4–6 bundles of herbs simultaneously. For gardeners who grow significant quantities of herbs in US Zones 5–8 and want to preserve a full season’s harvest, a dehydrator pays for itself quickly.

Microwave drying

Microwave drying is fast (1–3 minutes) and works for small batches. Place herb stems between two paper towels and microwave in 30-second intervals until leaves crumble easily. Check carefully — herbs can scorch.

This method works best when you need to dry a small amount quickly. The quality is inconsistent compared to other methods, and there is a risk of scorching if the microwave runs too long.

Microwave drying steps:

1. Remove leaves from stems or leave in small sprigs
2. Place between two sheets of paper towel
3. Microwave on high for 30 seconds
4. Check — if leaves are not dry yet, continue in 15-second intervals
5. Total time: 1–3 minutes depending on moisture content
6. Allow to cool completely before testing; herbs continue to dry slightly as they cool

Note: woody herbs like rosemary and thyme often spark in the microwave if stems contain too much mineral content. If you see sparking, stop immediately and use a different method.

How to store dried herbs

Store dried herbs in airtight glass jars in a cool, dark cabinet. Heat, light, and moisture are the three main factors that degrade herbs after drying. A dark cabinet away from the stove is the correct location — not a decorative rack on the counter in sunlight.

Storage specifics:

• Container: Glass jars with tight lids. Mason jars are ideal. Avoid plastic, which allows air exchange over time.
• Location: Cool, dark cabinet — pantry, lower cabinet, or basement shelf
• Temperature: Below 70°F is ideal. Herb degradation accelerates above 75°F.
• Light: No direct or indirect sunlight. UV light breaks down volatile oils.

How long dried herbs last:

• Whole dried herb leaves: 6–12 months at peak flavor; 18 months acceptable
• Crumbled dried herbs: 6 months at peak; 12 months acceptable
• Dried herb seeds (coriander, fennel, caraway): 1–2 years

Label every jar with the herb name and drying date. Without dates, you will not know which jars are fresh and which are a year or more old. Use masking tape and a marker — it peels off cleanly when you reuse jars.

Which herbs to freeze instead of dry

Freezing is the better preservation method for basil, cilantro, chives, and flat-leaf parsley. These herbs have volatile aromatic compounds that degrade rapidly during drying.

Freezing methods:

Ice cube trays with water: Chop herbs roughly. Pack loosely into ice cube tray compartments. Fill with water and freeze. Pop cubes into a labeled freezer bag. Add directly to soups, stews, and sauces while cooking. Each cube holds about 2 tablespoons of chopped herb.

Ice cube trays with olive oil: Same method as above but fill with olive oil instead of water. Better for basil. Olive oil preserves basil better than water because it excludes oxygen.

Flat freeze on trays: Spread whole herb leaves in a single layer on a parchment-lined tray. Freeze until solid (about 2 hours). Transfer to a labeled freezer bag. Works for basil, mint, and sage. Pull out individual leaves as needed.

Frozen herbs last 4–6 months with acceptable quality. The texture softens after freezing, which makes them best for cooked applications rather than fresh garnish.

For timing when to harvest garlic scapes and bulbs before drying — a slightly different process than leafy herbs — our when to harvest garlic guide covers curing and storage steps specific to alliums. For rhubarb, which requires different post-harvest handling, our when to harvest rhubarb guide covers timing and storage by US zone.

The National Center for Home Food Preservation at the University of Georgia maintains evidence-based guidance on drying herbs that covers safe moisture levels and storage parameters for home-dried herbs — a valuable reference for US gardeners processing larger herb quantities.

A note on thyme and oregano quality after drying

Both thyme and oregano are notably more flavorful dried than fresh in many cooked applications. This is the exception to the rule. Thymol and carvacrol — the primary oils in thyme and oregano — are concentrated rather than lost during the drying process. Many US cooks prefer dried thyme and oregano for pasta sauces, stews, and roasted vegetables.

Harvest thyme and oregano just before flowering for peak flavor in the dried product. For thyme varieties and care by US zone, our creeping thyme guide covers the difference between culinary thyme and ground-cover types. For sage — another herb that dries well and is widely used in US Thanksgiving cooking — our salvia guide covers the range of salvia species grown in US gardens and which ones are culinary versus ornamental.