Fall · September 8, 2026

Niagara-on-the-Lake, Ontario

Great Lakes & St. Lawrence Lowlands·Hardiness zone 7a

Now

23°C · Overcast

Today

26° / 14°

Soil 6 cm

19°C

First frost

~62 days (Nov 9)

Gardening in Niagara-on-the-Lake

AI field guide · refreshed weekly

Gardening in Niagara-on-the-Lake: Early September Harvest & Fall Planting

You're in zone 7a with 62 days until your average first frost (Nov 9). Soil at 19°C is still warm enough for cool-season crops. Spring frost arrived Apr 22, giving you a solid 139 days of growth so far. Use this window to plant garlic, overwinter onions, and direct-seed fall brassicas and root crops before mid-September.

Sow outdoors now

  • Garlic (hardneck varieties: German Extra Hardy, German Stardust)

    Plant cloves 5 cm (2 in) deep in well-draining soil now through October; they'll root before frost and emerge in spring. Space 15 cm (6 in) apart in full sun.

  • Spinach (Bloomsdale, Space, Tyee)

    Direct-seed now for a 6–8 week harvest before hard frost; soil at 19°C is ideal. Thin to 10 cm (4 in) spacing.

  • Arugula (Roquette, Astro)

    Fast-growing (30–40 days); sow now for late-September/October harvest. Tolerates light frosts well.

  • Radish (Cherry Belle, French Breakfast)

    Matures in 25–30 days; sow now and again in 2 weeks for succession harvest before frost.

  • Turnip (Purple Top, Hakurei)

    Sow now for October harvest; 60–70 days to maturity. Thin to 15 cm (6 in) spacing.

Start indoors now

  • Kale (Winterbor, Lacinato, Scarlet Kale)

    Start seeds indoors now for transplanting in 4–5 weeks; these cold-hardy brassicas actually improve in flavor after frost. Harden off before transplanting.

  • Broccoli (Calabrese, Arcadia)

    Sow indoors now; transplant in 5–6 weeks for October/November harvest. Needs 60–70 days to head.

  • Cabbage (January King, Tundra)

    Start now for late-season transplants; these store well and tolerate cold. Transplant in 4–5 weeks.

Harvest now

  • Tomatoes (all varieties)

    Pick all remaining fruit before first hard frost (Nov 9). Green tomatoes ripen indoors at room temperature in 2–3 weeks.

  • Peppers (sweet and hot)

    Harvest mature peppers now; plants will slow production as nights cool. Leave immature fruit to ripen indoors if needed.

  • Beans (bush and pole)

    Pick pods regularly to encourage final flushes before frost. Shell beans for drying if mature.

  • Summer squash & zucchini

    Harvest at 15–20 cm (6–8 in) length; production slows as soil cools but plants often fruit until frost.

Tasks this week

  • Deadhead spent flowers to redirect energy into seed production or extend blooms on perennials.
  • Cut back perennials only after frost blackens foliage; premature cutting invites disease.
  • Divide spring-blooming perennials (peonies, daylilies) now through October for spring vigor.
  • Clean up fallen leaves and debris to reduce slug and disease habitat over winter.
  • Stop fertilizing trees, shrubs, and perennials to harden them for dormancy.

Watch out for

  • Powdery mildew thrives in cool, humid fall nights; ensure good air circulation and avoid overhead watering.
  • Early blight on tomatoes accelerates as nights cool—remove lower leaves and harvest green fruit before frost.
  • Slugs are active in damp conditions; handpick at dusk or use beer traps around tender seedlings.

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