When to Plant Garlic in Ontario — 2026 Guide
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.
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.
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
🌿 Best for Southern Ontario — Toronto, Windsor, Hamilton
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.
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.
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.
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.
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.
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.
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 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.
📖 Related Guides
More planting guides for Ontario vegetable gardeners.