Fall · September 8, 2026

City of Saint John, New Brunswick

Acadian Forest & Atlantic Coast·Hardiness zone 6a

Now

16°C · Clear

Today

19° / 11°

Soil 6 cm

15°C

First frost

~54 days (Nov 1)

Gardening in City of Saint John

AI field guide · refreshed weekly

Saint John Gardening: Early September – Race Against First Frost

Zone 6a means your first fall frost arrives around November 1—you have 54 days left. Soil at 15°C is cool but workable; air temps this week range 7–25°C with a warm spike on the 10th. Spring frost typically hits May 4, giving you 181 frost-free days annually. Plan all sowings and plantings with November 1 as your hard deadline.

Sow outdoors now

  • Spinach (Spinacia oleracea 'Space' or 'Bloomsdale')

    Direct sow now for fall harvest before frost; germinates well in 15°C soil and matures in 40–50 days.

  • Arugula (Eruca sativa)

    Fast-growing (30 days to harvest), cold-tolerant, and thrives in cooling soil; sow thickly for best yield.

  • Mâche (Valerianella locusta)

    Extremely frost-hardy; sow now for winter grazing into November and even under snow cover.

  • Radish (Raphanus sativus 'Cherry Belle')

    Matures in 25–30 days; plant by mid-September to harvest before hard frost.

  • Turnip (Brassica rapa 'Purple Top')

    Sow by September 15 for October harvest; roots sweeten after light frost and store well.

Start indoors now

  • Kale (Brassica oleracea 'Lacinato' or 'Winterbor')

    Start seeds indoors now for transplant by late September; kale improves in flavor after frost and lasts into November.

  • Cabbage (Brassica oleracea 'January King' or 'Tundra')

    Sow indoors for transplant in 3–4 weeks; both varieties are cold-hardy and store through winter.

Harvest now

  • Tomatoes (all varieties)

    Pick all remaining fruit—even green ones—before first frost (Nov 1); ripen indoors on a sunny windowsill or in a paper bag with an apple.

  • Beans (Phaseolus vulgaris)

    Harvest all pods now; plants will frost-kill within weeks.

  • Squash and pumpkins (Cucurbita spp.)

    Cut with 5 cm (2 in) stem attached; cure in a warm, dry place for 10 days before storage.

  • Herbs (basil, cilantro, parsley)

    Cut and dry or freeze now; tender annuals will blacken at first frost.

Tasks this week

  • Mulch root crops (beets, carrots, parsnips) with 10 cm (4 in) straw to extend harvest and protect from frost.
  • Pull spent summer crops (lettuce, peas) and turn soil; add compost to prepare beds for fall plantings.
  • Water newly sown seeds and transplants well; soil dries quickly in wind and cool temps.
  • Set up row covers or cold frames over fall greens to add 2–3 weeks to harvest season.
  • Scout for aphids and cabbage moths on brassicas; hand-pick or use neem oil before frost slows pests.

Watch out for

  • Frost risk: Even light frost (0°C / 32°F) will kill tender plants like tomatoes, beans, and basil; watch the forecast closely after October 15.
  • Wind: Gusts to 47 km/h (29 mph) on September 10 may topple tall crops or dry soil rapidly—stake tall plants and water before the blow.
  • Slugs and snails thrive in cool, damp conditions; handpick or use beer traps around fall greens.

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