Fall · September 8, 2026

Washington, District of Columbia

Northeast Atlantic Coast & Piedmont·Hardiness zone 8a

Now

29°C · Partly cloudy

Today

30° / 16°

Soil 6 cm

23°C

First frost

~61 days (Nov 8)

Gardening in Washington

AI field guide · refreshed weekly

Gardening in DC: Early Fall Planting & Harvest — September 8–14

You're in zone 8a with 61 days until the average first frost (November 8). Soil at 23°C (73°F) is ideal for cool-season seeds. Spring frost averaged April 11, so you have a solid 211-day growing season. This week's warm days and scattered rain mid-week create perfect conditions for fall crops.

Sow outdoors now

  • Lettuce & Mesclun

    Direct-sow 'Buttercrunch', 'Lollo Rosso', or 'Oakleaf' now; they'll mature in 45–55 days before hard frost. Space 15 cm (6 in) apart in loose, moist soil.

  • Spinach

    Sow 'Space' or 'Bloomsdale Long Standing' 1 cm (½ in) deep; germinates in 7–10 days and tolerates light frost once established. Thin to 10 cm (4 in).

  • Arugula

    Fast-growing (30–40 days); sow thickly and harvest leaves young. Thrives in cool soil and can handle frost down to –3°C (25°F).

  • Radish

    Plant 'Cherry Belle' or 'French Breakfast' 1 cm deep, 5 cm (2 in) apart; ready in 25–30 days. Succession-sow every 10 days through mid-October.

  • Kale

    Sow 'Winterbor' or 'Lacinato' now for November–December harvest; cold actually improves flavor. Space 30 cm (12 in) apart.

Start indoors now

  • Cabbage & Broccoli

    Start 'Early Jersey Wakefield' cabbage and 'Arcadia' broccoli indoors; transplant in 4–5 weeks for late-October/November harvest. Use seed trays with drainage.

  • Cauliflower

    Sow 'Snowball Y' or 'Graffiti' indoors now for transplant by early October. Needs 55–70 days to curds; timing is tight but doable.

  • Onion Sets & Garlic Prep

    Begin hardening off garlic cloves indoors (chill at 4°C for 4–6 weeks) before direct planting in late October. Onion sets go straight outdoors.

Harvest now

  • Late Summer Tomatoes & Peppers

    Pick ripe fruit daily; green tomatoes will ripen indoors if picked before frost. Pinch off new flowers to redirect energy to ripening existing fruit.

  • Beans & Peas

    Harvest snap beans and any lingering summer peas while tender. Check plants every 2–3 days to encourage continued production.

  • Herbs

    Cut basil, cilantro, and parsley hard before frost; dry or freeze. Perennial herbs (thyme, sage, oregano) can be lightly harvested through fall.

  • Summer Squash & Zucchini

    Pick small to medium fruit; large ones slow production. Remove any diseased leaves to improve air flow and reduce powdery mildew.

Tasks this week

  • Deadhead spent flowers on perennials and annuals to extend bloom and tidy beds before fall cleanup.
  • Water newly sown seeds gently and consistently; soil at 23°C dries quickly in low humidity (45% today).
  • Scout for aphids and spider mites on late crops; spray with neem oil if needed, early morning or evening.
  • Divide and transplant spring-blooming perennials (daylilies, coneflowers, black-eyed Susans) while soil is still warm.
  • Prepare beds for fall planting by mixing in compost; avoid working wet soil after mid-week rain.

Watch out for

  • Powdery mildew thrives in warm, humid mornings; improve air flow and avoid overhead watering.
  • Japanese beetles may still be active; hand-pick early morning or use traps away from desirable plants.
  • Deer and groundhogs increase foraging pressure in fall; protect young brassicas and leafy greens with fencing or netting.

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