Fall · September 8, 2026

Fairbanks, Alaska

Boreal North & Taiga

Now

11°C · Drizzle

Today

13° / 10°

Soil 6 cm

11°C

First frost

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Gardening in Fairbanks

AI field guide · refreshed weekly

Fairbanks Garden: Final Harvest & Season Close (Sept 8–14)

Zone 3a with first frost arriving in ~12 days (avg Sep 20). Soil at 11°C is still workable but cooling fast. You have roughly one week of reliable growing weather left; after Sep 20, hard freeze will end the season. Use this window to harvest cold-tolerant crops and clear beds before ground freezes solid.

Sow outdoors now

  • Spinach (cold-hardy varieties: 'Space' or 'Bloomsdale')

    Direct sow now for microgreens or baby leaf harvest before frost; germinates in 7–10 days at 11°C soil. Will not reach full size but provides 2–3 weeks of grazing.

  • Mâche (corn salad)

    Extremely cold-hardy; sow now for late-season salad greens. Tolerates light frosts and can be harvested under snow in early winter.

  • Radish ('Cherry Belle' or 'Icicle')

    Quick 25–30 day crop; sow now for harvest by early October before hard freeze. Roots sweeten after light frost.

Start indoors now

Nothing to start indoors this week.

Harvest now

  • Potatoes (all varieties)

    Dig now before soil freezes; cure in cool, dark place for 2 weeks. Frost will damage tubers left in ground.

  • Carrots ('Nantes' or 'Chantenay')

    Pull before hard freeze; light frost sweetens them but hard freeze damages roots. Store in cool cellar or bury in sand.

  • Brassicas (cabbage, kale, broccoli)

    Harvest heads and leaves now; kale actually improves after light frost but will die in hard freeze. Cut before Sep 20.

  • Peas (snap and snow varieties)

    Pick remaining pods; vines will blacken at first hard frost. Any immature peas can be dried for storage.

Tasks this week

  • Pull spent annuals and clear beds to reduce overwintering pest habitat
  • Mulch perennial beds with 5–8 cm (2–3 in) of compost or aged manure before ground freezes
  • Drain and store hoses; shut off outdoor water lines to prevent freeze damage
  • Harvest and cure all root crops and winter squash before Sep 20
  • Sow garlic cloves 5 cm (2 in) deep in prepared beds; mulch heavily after soil surface freezes

Watch out for

  • Hard freeze arrives in ~12 days: any tender perennials (roses, some berries) will die back; cut back and mulch heavily now
  • Wet soil + cold = root rot: ensure beds drain well before freeze-thaw cycles begin
  • Voles and mice shelter in garden debris: clear old mulch and plant material to reduce winter rodent habitat

Useful gear

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