Fall · September 8, 2026

City of Fredericton, New Brunswick

Acadian Forest & Atlantic Coast·Hardiness zone 5b

Now

15°C · Clear

Today

19° / 11°

Soil 6 cm

15°C

First frost

~43 days (Oct 21)

Gardening in City of Fredericton

AI field guide · refreshed weekly

Fredericton Gardening: Early September – Harvest, Sow Cool-Season Crops, Prepare for Frost

Zone 5b means your first fall frost arrives around October 21—43 days away. Soil at 15°C is cool enough for direct-seeding cool-season crops but too cold for warm-season germination. Spring frost averaged May 8, so you're 123 days into the growing season. Nights are already dipping to 6–10°C; frost can strike any night after mid-October.

Sow outdoors now

  • Spinach (Spinacia oleracea)

    Sow directly now; germinates well at 15°C soil temp. 'Space' and 'Bloomsdale Long Standing' mature in 40–50 days before hard frost.

  • Arugula (Eruca sativa)

    Direct-sow thickly; ready in 30–40 days. Thrives in cool fall weather and tolerates light frosts.

  • Radish (Raphanus sativus)

    Sow 'Cherry Belle' or 'French Breakfast' now; harvest in 25–30 days before soil freezes.

  • Mâche (Valerianella locusta)

    Direct-sow for fall/winter harvest; extremely cold-hardy and germinates at cool soil temps.

  • Kale (Brassica oleracea)

    Sow 'Lacinato' or 'Winterbor' now; sweetens after frost and overwinters in zone 5b with mulch.

Start indoors now

  • Cabbage transplants (Brassica oleracea)

    Start 'January King' or 'Savoy' indoors for transplanting in 2–3 weeks; harvest before hard freeze.

  • Broccoli (Brassica oleracea)

    Start 'Calabrese' or 'De Cicco' indoors now; transplant in 3 weeks for October harvest.

  • Garlic cloves (Allium sativum)

    Start in pots indoors now for transplanting outdoors in late September; needs 4–6 weeks of cool soil before winter dormancy.

Harvest now

  • Tomatoes (Solanum lycopersicum)

    Pick all fruit—ripe or mature green—before first frost (Oct 21). Ripen green ones indoors at 18–21°C.

  • Beans (Phaseolus vulgaris)

    Harvest pods before frost kills plants; shell dry beans for storage if mature.

  • Squash & Pumpkins (Cucurbita spp.)

    Cut before frost with 5 cm (2 in) stem; cure in warm, dry place for 2 weeks before storage.

  • Carrots (Daucus carota)

    Dig now or leave in ground under heavy mulch for storage; frost actually improves sweetness.

Tasks this week

  • Mulch root crops (carrots, beets, turnips) heavily with straw or leaves to extend harvest into November.
  • Clean up spent tomato, bean, and squash plants; compost disease-free material, burn or bin diseased foliage.
  • Plant garlic cloves outdoors in late September after hardening off indoor starts; needs 4–6 weeks of cool soil.
  • Deadhead perennials and cut back spent annuals to tidy beds and reduce pest overwintering sites.
  • Water deeply before the cold snap; dry soil freezes faster and damages root systems.

Watch out for

  • Frost risk: Nights already 6–10°C; cover tender plants with row cover or blankets if frost threatens before Oct 21.
  • Powdery mildew and early blight thrive in cool, damp fall conditions—remove affected leaves and improve air circulation.
  • Slugs and snails accelerate feeding in cool weather; hand-pick at dusk or use beer traps in high-traffic beds.

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