How to Freeze Herbs in Canada (Ice Cube Method)

If you’ve ever watched a perfect basil plant go to flower and then to compost because you couldn’t use it all fresh, this guide is for you. Freezing herbs in oil cubes preserves fresh-herb flavour better than any other home method — dramatically better than drying for tender herbs like basil and cilantro.

This is the lowest-equipment preserving project on the entire site. Ice cube tray, herbs, oil, freezer. That’s it.

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Why oil cubes vs drying

For tender herbs, oil cubes are dramatically better than drying:

	Frozen in oil	Dried (best case)
Basil	85% flavour retained	30% retained
Cilantro	90% retained	20% (bland green flakes)
Parsley	80% retained	50%
Dill (fronds)	80% retained	40%
Mint (for cooking)	80% retained	60% (better for tea)
Tarragon	85% retained	50% (loses anise punch)

For hardy herbs (rosemary, thyme, oregano, sage), drying works almost as well as freezing — see how to dry herbs. Use freezing for tender herbs; use drying for woody/hardy herbs.

What you need

• Fresh herbs from garden or farmer’s market — 1 large bunch makes 1 ice-cube tray
• Olive oil (extra-virgin) OR unsalted butter, melted OR ghee
• Ice cube tray — silicone is easiest for popping cubes out; standard plastic works
• Sharp knife or kitchen shears
• Cutting board
• Clean tea towels for drying herbs
• Heavy-duty freezer bags for cube storage
• Permanent marker for labelling

Estimate: 1 large bunch of herbs + ¼ cup olive oil = 1 standard 16-cube tray.

Method

Step 1: Wash and dry herbs

1. Inspect herbs — discard yellowed or brown leaves, any with visible mould.
2. Wash gently by dunking in a bowl of cool water and lifting out (don’t rinse under tap — bruises leaves).
3. Pat dry thoroughly with clean tea towels — water in the freezer bag = ice crystals = freezer burn.

Step 2: Strip leaves and chop

For tender herbs (basil, parsley, cilantro, dill, mint, tarragon):

1. Strip leaves from stems. Stems often have stronger flavour but tougher texture — leaves alone make smoother cubes.
2. Chop fine — about 3-5 mm pieces. Smaller pieces release flavour faster in cooking.

For chives:

1. Cut into 5 mm pieces with kitchen shears. No stems involved.

For hardy herbs (if freezing instead of drying):

1. Strip leaves from woody stems — discard stems.
2. Chop fine — rosemary needles especially benefit from chopping.

Step 3: Pack the tray

1. Spoon chopped herbs into each ice cube compartment.
2. Fill to about 75% full — leave room for oil to fully coat.
3. Press down gently with the back of the spoon.

A standard 16-cube tray (~30 mL per cube) holds about 2 cups of chopped herbs in total.

Step 4: Add oil (or butter)

1. Pour olive oil over each cube until herbs are submerged and the tray is filled.
2. Or pour melted butter if making butter cubes (let butter cool to lukewarm first — too hot melts the tray or “cooks” the herbs).
3. Tap the tray gently on the counter a few times to settle herbs and release air pockets.

Step 5: Freeze

1. Place the tray flat in the freezer.
2. Freeze 4 hours minimum, or overnight.
3. Cubes should be solid all the way through.

Step 6: Transfer to bags

1. Pop cubes out of the tray. Silicone trays release easily; plastic trays may need a brief dip in warm water on the underside.
2. Transfer to labelled freezer bags — one bag per herb type, or mixed-herb bags for specific recipes (e.g., “Italian — basil + parsley + oregano”).
3. Press air out of the bag before sealing.
4. Label with herb type + date.
5. Return to freezer.

Storage

• At -18°C in airtight freezer bag: 6-12 months at peak quality
• Vacuum-sealed: 12-18 months
• Beyond 12 months: still safe but flavour fades; use in cooked applications where freshness matters less

The shelf-life killer is air exposure during long storage — bags that aren’t fully sealed or get repeatedly opened lose flavour faster.

How to use frozen herb cubes

The beauty of the cube method is no thawing required.

In cooking

• Sautéing onions — drop 1-2 cubes into the hot pan; the oil melts and the herbs join the cooking
• Pasta sauces — drop cubes into simmering tomato sauce in the last 5 minutes
• Soups and stews — drop in 1-3 cubes per pot, depending on size
• Roast vegetables — drop a cube on top of seasoned vegetables before roasting
• Pizza dough — drop a melted-butter herb cube on top of dough before baking
• Risotto — stir 1-2 cubes into the rice in the last minute
• Grilled meats — let a butter-herb cube melt over a hot steak right off the grill
• Bread — melt a cube into garlic butter for garlic bread

As a finishing oil

• Pan sauces — melt a cube into the pan after deglazing
• Marinades — melt 2-3 cubes and use as the oil base
• Salad dressings — for “fresh-herb” winter dressings, melt a cube and whisk with vinegar
• Drizzle on soup — let a cube melt into hot soup at serving

Recipe portions

• 1 cube ≈ 1-2 tbsp of fresh herbs
• 3 cubes ≈ ¼ cup fresh herbs
• 6 cubes ≈ ½ cup fresh herbs

Combinations

Pre-mix herb blends for common recipes:

Italian blend cubes

Equal parts basil + parsley + oregano. Olive oil. Use in pasta sauces, pizzas, vegetable sautés.

Pesto base cubes

Basil + parsley (3:1) + a clove of garlic (chopped) per cube + olive oil. Drop 4 cubes into a blender with parmesan, pine nuts, and a splash of fresh olive oil for instant pesto.

Tex-Mex blend

Cilantro + 1 small jalapeño slice per cube + lime juice + olive oil. For guacamole, salsa, taco filling.

French blend (fines herbes)

Equal parts parsley + chervil + tarragon + chives. Butter. For omelettes, fish, chicken.

Indian blend

Cilantro + 1 small piece fresh ginger per cube + 1 small garlic clove + neutral oil (ghee). For curries and dals.

Asian blend

Cilantro + green onion + fresh ginger + sesame oil. For stir-fries.

Variation: chimichurri cubes

A condiment in cube form. Combine in food processor:

• 1 cup parsley
• ½ cup cilantro
• 4 garlic cloves
• 1 small shallot
• 1 tbsp red wine vinegar
• 1 tsp red pepper flakes
• ¾ cup olive oil
• ½ tsp salt

Pulse until coarse-chopped. Pack into ice cube tray. Freeze. Pop into bags.

Drop 2-3 cubes onto grilled steak straight from the freezer.

Variation: garlic herb butter cubes

For a finishing butter:

• 250 g unsalted butter, softened (not melted)
• ¼ cup mixed soft herbs (parsley, chives)
• 4 garlic cloves, minced
• 1 tsp lemon zest
• ¼ tsp salt

Beat together. Spoon into ice cube tray. Freeze. Drop a cube on a hot steak, baked potato, or vegetables.

What NOT to freeze in oil cubes

• Garlic alone in oil at room temperature — botulism risk if not frozen (freezing eliminates the risk)
• Cooked oil mixtures — if oil has already been heated to cooking temperature and cooled, freezing doesn’t reset its quality
• Mayonnaise-based mixtures — separate on thaw
• Cream-based herb mixtures — split on thaw
• Hardy herbs alone — drying preserves them better than freezing for most uses

Common problems

• Cubes won’t release from the tray. Plastic tray + tightly-frozen contents. Briefly dip the tray bottom in warm water (5-10 seconds). Use silicone trays next batch.
• Herbs floated to the top of the cubes. Normal. Stir or tap the tray more during initial freeze.
• Oil solidified at the bottom of the cube. Olive oil solidifies in the freezer; that’s the expected texture. Doesn’t affect quality.
• Cubes taste bitter. Old oil, or freezer-burned cubes. Use fresh olive oil; vacuum-seal for long storage.
• Cubes have ice crystals on the outside. Herbs weren’t dried thoroughly before mixing. Pat completely dry next time.
• Cubes turned brown. Air exposure during freezing. Cover the tray with cling wrap during initial freeze; vacuum-seal storage bags.

Yield expectations

• 1 large bunch of basil (about 100 g) → 1 standard ice cube tray (~16 cubes)
• A 2 m² garden basil patch → 5-8 trays per harvest, 2-3 harvests per season
• A typical Canadian household with a herb garden freezes 30-60 cubes per herb per season

A single batch of 16 cubes per herb covers most cooking needs for 6-12 months.

Why oil cubes are worth it

• Best preservation method for tender herbs — vastly outperforms drying for basil, cilantro, dill
• Recipe-ready portions — no measuring, no chopping at cook time
• Use directly from frozen — no thaw delay
• Cheap — ice cube trays cost $5-15, herbs from your garden are free
• Reduces food waste — surplus herbs become cooking shortcuts instead of compost
• Maintains fresh flavour — significantly closer to fresh than dried for tender herbs

The botulism note one more time

Freezing prevents botulism in oil-and-herb mixtures. Room-temperature storage of oil-and-herb mixtures has caused botulism cases — Clostridium botulinum loves oxygen-free oil environments at warmth.

• ✅ Frozen oil-herb cubes — safe for 6-12 months
• ✅ Refrigerated within 1-3 days, used quickly — safe
• ❌ Room-temperature oil-herb mixtures stored for weeks — unsafe
• ❌ Refrigerated oil-herb mixtures stored for weeks — unsafe

Keep your cubes frozen until use. Don’t take a jar of herb-in-oil out of the freezer and leave it on the counter for the week.

Next steps

• How to dry herbs in Canada — for hardy herbs (rosemary, thyme, oregano, sage)
• How to freeze berries in Canada — companion freezer technique
• How to freeze vegetables in Canada — blanching basics
• Best dehydrator in Canada — for the dry-herb alternative
• Freezing & blanching pillar — broader method context
• How to tell if canned food has gone bad — same sensory rules for stored food