What type of garlic should I grow in Ontario?

Hardneck garlic is the right choice for all Ontario zones. Hardneck varieties are cold-hardy, produce large flavorful cloves, and are adapted to Canadian winters. Softneck garlic (the type sold in grocery stores) is bred for mild climates — it doesn't overwinter reliably in Ontario and doesn't produce well in cold conditions. Best hardneck varieties for Ontario: Music (large cloves, very cold-hardy, reliable across all zones), Rocambole types (complex flavour, best for Toronto and Windsor), and German Red (robust, excellent for Ottawa and colder zones).

When do I harvest garlic in Ontario?

Garlic planted in fall is harvested the following summer — July to early August depending on your location and the season. The signal to harvest is when the lower 3–4 leaves have turned brown and dry, while 5–6 green leaves remain. In Toronto: expect harvest late June to mid-July. Ottawa: mid to late July. Don't wait for all leaves to brown — once more than half the leaves are dry, the cloves begin to split their wrappers and won't store as long. Dig carefully with a fork, don't pull by the stem.

What are garlic scapes and when do I cut them?

Garlic scapes are the curly green flower stalks that hardneck garlic sends up in late May to June. Cut scapes off as soon as they've made one full curl — removing them redirects the plant's energy from seed production into bulb development, producing significantly larger bulbs. Toronto: cut scapes late May to mid-June. Ottawa: cut scapes early to mid-June. Scapes are edible and delicious — use them like garlic in stir-fries, pestos, and pasta. The scape harvest is one of the bonuses of growing hardneck garlic.

Can I plant garlic in spring in Ontario?

Spring-planted garlic produces very small bulbs in Ontario. Garlic needs a cold vernalisation period — extended cold exposure — to trigger proper bulb development. Without overwintering, cloves planted in spring produce single-clove rounds (called rounds or blind garlic) rather than divided bulbs with multiple cloves. While these are edible, they're far less productive than fall-planted garlic. Plant in fall for proper bulbs. If you miss the fall window, plant in early spring as soon as soil is workable, but expect significantly smaller yields.

How do I cure and store garlic after harvest in Ontario?

After harvesting, hang garlic in bundles of 10–15 in a dry, shaded, well-ventilated spot — a shed, garage, or covered porch works well. Cure for 3–4 weeks until the outer wrappers are papery and dry and the stems are completely dry. Do not wash or wet the bulbs. Once cured, cut stems to 2–3 cm, trim roots, and store in mesh bags or open containers in a cool dry room (10–15°C). Properly cured hardneck garlic stores for 6–9 months. Keep back your largest, best-shaped bulbs as seed garlic for planting the following October.

GARLIC GROWING GUIDE

When to Plant Garlic in Ontario — City Guide

Q: When should I plant garlic in Ontario?

Garlic is planted in fall in Ontario — not spring. The ideal planting window is 4–6 weeks before the ground freezes hard, which gives cloves time to develop roots before winter. Toronto and Windsor: plant October 10 to November 1. Ottawa and Kingston: plant October 1 to October 20. Hamilton and London: plant October 5 to October 25. Plant cloves 2–3 inches deep, 6 inches apart, pointy end up. Mulch with 4–6 inches of straw immediately after planting to insulate over winter.

Fall planting dates for every major Ontario city, the best hardneck varieties for Ontario winters, and the complete garlic calendar from planting to harvest, scape cutting, and curing.

When to plant garlic in Ontario is one of the most searched questions in the fall garden calendar — and it surprises many new gardeners that the answer is October, not spring. Garlic is planted in fall, overwinters in the ground, and is harvested the following July. This makes it one of the few vegetables that works backwards from everything else, and one of the most rewarding crops you can grow in Ontario with almost no spring or summer attention required.

This guide covers fall planting dates for every major Ontario city, hardneck vs softneck varieties, overwintering care, the scape harvest, and how to cure and store your garlic after the July harvest.

🍁

Looking for all of Canada? See the When to Plant Garlic in Canada guide — planting dates for every region including BC, Ontario, Prairies, and the Maritimes.

Ontario garlic planting at a glance: Plant in fall — not spring. Toronto and Windsor: Oct 10–Nov 1. Ottawa and Kingston: Oct 1–20. Hamilton and London: Oct 5–25. Plant 2–3 inches deep, pointy end up. Mulch with 4–6 inches of straw immediately. Harvest the following July.

When should you plant garlic where you garden?

Get your city's frost dates, indoor seed-starting dates, and this week's planting jobs — three free tools.

📅 What to Plant Now ❄️ Frost Dates 🌱 Seed Starting

Ontario Garlic Planting Calendar — Fall 2026

Plant 4–6 weeks before the ground freezes hard. Too early and garlic sends up excessive top growth before winter. Too late and cloves don't develop roots before freeze and may heave out of the ground.

City	Zone	First Frost	Planting Window	Scape Harvest	Bulb Harvest
Windsor	7a	Oct 28	Oct 15–Nov 5	Late May–Jun 10	Late Jun–Jul 10
Toronto	6b	Nov 1	Oct 10–Nov 1	Late May–Jun 15	Late Jun–Jul 15
Hamilton	6b/7a	Oct 28	Oct 10–Nov 1	Late May–Jun 15	Late Jun–Jul 15
London	6a	Oct 20	Oct 5–Oct 25	Early–mid June	Early–mid July
Kingston	5b	Oct 15	Oct 1–Oct 20	Early–mid June	Mid July
Ottawa	5a	Oct 12	Oct 1–Oct 20	Mid June	Mid–late July

Hardneck vs Softneck Garlic — What to Grow in Ontario

This is the most important decision Ontario garlic growers make. Growing the wrong type — softneck — in Ontario leads to poor results. All Ontario garlic growers should be growing hardneck.

✓ Hardneck — Grow This in Ontario

Cold-hardy — overwinters reliably across all Ontario zones
Produces garlic scapes (bonus harvest)
Fewer, larger cloves — easier to peel and use
More complex, intense flavour than softneck
Available from local seed garlic suppliers in Ontario
Stores 6–9 months when properly cured

→ Music, Rocambole types, German Red, Russian Red

✗ Softneck — Avoid in Ontario

Bred for mild climates (California, Spain)
Doesn't overwinter reliably in Ontario winters
Produces small cloves without cold vernalisation
No scapes — less interesting to grow
This is what grocery stores sell — not suitable for Ontario gardens
May produce rounds (single cloves) instead of divided bulbs

→ Not recommended for Ontario gardeners

Best Hardneck Garlic Varieties for Ontario

Buy seed garlic from Ontario or Quebec suppliers — it's been grown and selected for Canadian winters. Avoid grocery store garlic as seed stock (it may be treated to prevent sprouting and is often a softneck variety).

🌿 Best for All Ontario Zones

Music The most popular hardneck in Ontario. Large, fat cloves, strong garlic flavour, very cold-hardy. Reliably produces 4–6 large cloves per bulb. Available from almost every Ontario seed garlic supplier. Excellent for Ottawa and colder zones.

German Red Rocambole type, intensely flavourful, performs well even in colder Ontario zones. Strong, complex flavour preferred by chefs. Slightly shorter storage than Music (4–6 months) but exceptional flavour.

Russian Red Purple-striped hardneck, very cold-hardy. Developed in BC but performs excellently across Ontario. Hot, rich flavour. Good storage. Reliable across all Ontario zones including Ottawa and Kingston.

🌿 Best for Southern Ontario — Toronto, Windsor, Hamilton

Rocambole types The most complex, nuanced garlic flavour. Shorter storage (3–5 months), so not ideal for northern Ontario. Best for Toronto and Windsor where the milder winters suit their slightly lower cold-hardiness. Includes Georgian Crystal, Spanish Roja.

Elephant Garlic Not true garlic — it's a leek relative. Produces enormous mild-flavoured bulbs. Less cold-hardy than hardneck garlic. Best in Toronto and Windsor Zone 6b–7a. Needs deep, rich soil. Milder flavour than true garlic.

The Complete Ontario Garlic Calendar

Garlic is one of the lowest-maintenance crops in the Ontario garden once planted. The entire growing process from planting to harvest spans 8–9 months, but active attention is only needed at three points.

October

Plant

Break bulbs into individual cloves. Plant pointy end up, 2–3 inches deep, 6 inches apart, rows 12 inches apart. Mulch immediately with 4–6 inches of clean straw. Water in if soil is dry.

Nov–Mar

Overwinter — no action needed

Garlic is dormant under the mulch. Cloves develop roots before freeze. The mulch protects from freeze-thaw cycles that can heave unprotected cloves. No watering, no fertilizing.

April

Emergence

Green shoots push through the mulch — one of spring's most reliable signs. Rake mulch back slightly to let shoots emerge fully. Apply a balanced fertilizer or top-dress with compost once shoots are 10 cm tall.

May–Jun

Scape harvest

Cut scapes when they've made one full curl. Don't wait — removing scapes early gives the largest bulb size benefit. Scapes are delicious — treat like green garlic in any savoury dish.

July

Harvest

Harvest when lower 3–4 leaves are brown, 5–6 remain green. Loosen soil with a fork — don't pull by stem. Brush off soil, don't wash. Move immediately to curing.

Jul–Aug

Cure and store

Hang in bundles in a dry shaded spot with good airflow for 3–4 weeks. Cut stems, trim roots, move to mesh bags in a cool dry room. Keep back the largest bulbs as seed garlic for October planting.

Ontario Garlic Planting Dates by Region

Garlic is planted in fall and harvested the following July — cloves need 4–6 weeks of root growth before the ground freezes hard. The trigger is soil cooled to 10°C; in Ontario that's mid-October through mid-November depending on region.

Ontario region	Zone	Fall plant window	Scape / harvest	Cities
Niagara / Carolinian	7a	Oct 25–Nov 15	June 8 / July 20–30	St. Catharines, Niagara-on-the-Lake, Pelee Island
Southwestern ON	6b–7a	Oct 20–Nov 10	June 10 / July 18–28	Windsor, London, Sarnia, Chatham-Kent
GTA / Golden Horseshoe	6a–6b	Oct 15–Nov 5	June 15 / July 20–August 1	Toronto, Mississauga, Hamilton, Oakville
Central ON / Lake Simcoe	5a–5b	Oct 10–Oct 30	June 18 / July 25–August 5	Barrie, Orillia, Peterborough, Kawartha Lakes
Eastern ON / Ottawa Valley	5a–5b	Oct 10–Nov 1	June 15 / July 22–August 2	Ottawa, Kingston, Cornwall, Pembroke
Northern ON	3b–4b	Sept 25–Oct 20	June 25 / August 1–15	Sudbury, North Bay, Thunder Bay, Timmins, Sault Ste. Marie

Ontario Garlic Pest & Problem Watchlist

Garlic is one of the most trouble-free Ontario crops, but four issues — three of them disease, one a pest — can ruin a year's planting. Scout when scapes emerge and again 2 weeks before harvest.

White rot (Sclerotium cepivorum)

The most-feared garlic disease in Ontario. Yellowing and wilting from May onwards; pull up affected plants and you find fluffy white mould and tiny black sclerotia on the bulb. Soil-borne for 20+ years. Control: never plant garlic from an unknown source in your beds; bag and bin (not compost) any affected plant; 8-year minimum rotation away from all alliums; consider a garlic-free year if rot appears.

Garlic bloat nematode

Microscopic worms causing stunting, yellow leaves and brown-spotted, soft bulbs that rot in storage. Ontario's biggest garlic threat in commercial production. Control: only plant certified clean seed garlic from a reputable Ontario grower; never replant cloves from grocery garlic; hot-water treat seed garlic (49°C for 20 minutes) if pressure is high.

Leek moth

Established in Ontario since the 2000s — small caterpillars tunnel into leaves, scapes, and developing bulbs. Look for windows in leaves and frass in scapes. Control: floating row cover from May through scape harvest; spray Bt at first sign of damage; remove and bin damaged scapes; pheromone traps confirm timing.

Rust (Puccinia allii)

Orange-yellow pustules on leaves in wet Junes — heavy infections reduce bulb size by half. Worse in crowded beds. Control: wide spacing (15 cm between cloves) for airflow; water at soil level only; remove and bin affected leaves; sulphur spray weekly during wet stretches; rotate beds 3 years away from alliums.

Small bulbs from late planting

Garlic planted after mid-November (or after the ground has frozen) doesn't establish roots in fall and produces small, single-clove "rounds" the next July. Control: plant by Halloween in southern Ontario, by late October further north; if you missed the window, plant anyway — small bulbs replanted next fall will size up.

Ontario Garlic Growing Tips

Buy Ontario-grown seed garlic

Seed garlic grown in Ontario or Quebec is already adapted to Canadian winters — it's been selected through generations of growing in cold climates. Garlic from California or imported grocery stores may be treated with growth inhibitors, may be a softneck variety, and hasn't been selected for cold-hardiness. Ontario seed garlic suppliers include Stratford-area farms, Eastern Ontario garlic festivals, and online Canadian seed companies. Buy seed garlic in August and September before supplies sell out.

Mulch immediately after planting — don't wait

Straw mulch is essential for Ontario garlic. It insulates the soil from severe freeze-thaw cycles that can heave cloves out of the ground, retains moisture during the root development period, and suppresses weeds in spring. Apply 4–6 inches of clean straw immediately after planting — before the first hard freeze. Don't use hay (contains weed seeds). Leaves work as a mulch but compact into a waterproof mat — use straw instead. The mulch stays in place all winter.

Cut scapes early for biggest bulbs

The scape — hardneck garlic's curly flower stalk — diverts energy to seed production if left on the plant. Cutting it early (at the first full curl) redirects that energy to bulb development and produces noticeably larger bulbs. Research shows scape removal increases bulb weight by 20–30%. Don't throw scapes away — they're tender, garlicky, and delicious. Chop them like green onions, blend into pesto, or stir-fry them whole.

Don't harvest too late

Ontario gardeners often harvest garlic too late, waiting for all leaves to brown. Harvest when the lower 3–4 leaves have browned and 5–6 green leaves remain. At this stage the bulb has its maximum wrapper layers intact — these papery outer skins are what allows long storage. If you wait until all leaves are brown, the outer wrappers split and the bulb won't store well. Check bulbs by pulling one test plant in late June to gauge progress.

Cure properly for long storage

Curing is what converts freshly harvested garlic into the long-storing product most people are familiar with. Hang in bundles in a dry, shaded, ventilated space for 3–4 weeks — a garage, shed, or covered porch works well. Airflow is more important than temperature. Don't wash the bulbs — moisture promotes rot. Once stems and roots are fully dry and the outer wrappers are papery, cut stems to 2–3 cm, trim roots, and move to mesh bags in a cool room. Properly cured Music garlic stores for 8–9 months.

Ontario Garlic vs BC and Quebec

Garlic is grown across Canada — timing varies by frost-free days and how hard the winters are. Quebec and Ontario are Canada's primary garlic-producing regions.

City	Plant	Scapes	Harvest	Notes
Vancouver, BC	Oct 15–Nov 15	May–Jun	Mid Jun–Jul	Mild winters — mulch less critical but still recommended
Toronto, ON	Oct 10–Nov 1	Late May–Jun 15	Late Jun–Jul 15	Excellent garlic region — hardneck essential
Ottawa, ON	Oct 1–20	Mid June	Mid–late July	Plant slightly earlier — harder winters need more root time
Montreal, QC	Oct 1–20	Mid June	Mid–late July	Quebec is Canada's largest garlic-growing province
Calgary, AB	Sept 20–Oct 10	Late June	Late July–Aug	Plant earlier — ground freezes sooner. Heavy mulch essential.

Frequently Asked Questions

When should I plant garlic in Ontario?

In fall — 4–6 weeks before the ground freezes hard. Toronto and Windsor: October 10 to November 1. Ottawa and Kingston: October 1 to 20. Hamilton and London: October 5 to 25. Use the frost calculator to find your city's first fall frost date, then count back 4–6 weeks.

Can I plant garlic from the grocery store?

It's not recommended. Grocery store garlic is almost always softneck — unsuitable for Ontario winters. It may also be treated with growth inhibitors that prevent sprouting, and it's typically grown in California or China without selection for cold-hardiness. Buy hardneck seed garlic from an Ontario or Quebec supplier. Cost is roughly $15–25 for enough to plant a 4×4 bed, and you can save your own seed garlic every year after the first purchase.

What if I missed the fall planting window?

If the ground hasn't frozen hard, plant as late as you can — even November plantings can work in Toronto with heavy mulch. If you've missed the window entirely, plant in early spring as soon as soil is workable. Spring-planted garlic won't produce divided bulbs with multiple cloves — it produces rounds (single-clove bulbs) — but these are edible and you won't lose the entire season.

How deep do I plant garlic in Ontario?

Plant cloves 2–3 inches deep (5–7 cm), pointy end up, flat end down. In colder zones (Ottawa, Kingston), plant at the deeper end of that range — the extra soil depth provides more insulation through the winter. Spacing: 6 inches between cloves, 12 inches between rows. Deeper planting in heavy clay soil can cause problems — mix in compost to improve drainage before planting.