Start Your Fall Garden Now: A Zone 7a Late Spring Seed Guide

August is three months away. The tomatoes are just starting to set fruit. The peppers have finally decided to flower. Most gardeners in Zone 7a are looking forward, not backward.

But the best fall harvests do not start in August. They start now, in late May, when the garden is busy and the mind is on summer.

This guide tells you exactly what to seed in the next four weeks to build a fall and winter harvest that stretches from late summer through November.

Why Fall Gardens Beat Spring Gardens

Fall gardening has an advantage that spring gardening does not. The weather gets better as the season goes along.

In spring, you start cold and wet. You wait for the soil to warm. You fight late frosts. The ground is heavy and sluggish.

In fall, you start hot and dry. The soil is warm from summer. The heat helps seeds pop quickly. Then as the days shorten and the temperatures drop, your crops enter their best growth window. Broccoli heads get tight. Carrots get sweet. Greens turn tender. Tomatoes in late summer can get sunscald and cracking. Nothing has that problem in October.

The tradeoff is timing. You have to start planning in late spring. If you wait until August to think about fall crops, you have already missed the window for heading brassicas.

What to Start Indoors in Late May

Heading brassicas need the longest lead time of any fall crop. Broccoli, cauliflower, and cabbage take 50 to 60 days from seed to transplant, and they need to go into the garden in mid to late August when the heat starts to drop but the soil is still warm.

Start these seeds indoors now in seed trays or small pots with a good seed starting mix. Keep them in a spot that gets six to eight hours of light. They do not need heat mats. Room temperature is fine.

Broccoli

• Sow indoors in late May
• Transplant to the garden in mid to late August
• First fall harvest arrives late September to October
• Best varieties for Zone 7a fall: de Cicco (loose head, side shoots), Green Goliath, Safari

Cauliflower

• Sow indoors in late May
• Transplant in mid to late August
• First harvest in October
• More finicky than broccoli. It needs consistent moisture and the curd needs to be blanched by tying the outer leaves around it
• Best varieties: Snowball (standard white head), Romanesco (the ornamental green version), Amazing

Cabbage

• Sow indoors in late May
• Transplant in late August
• Harvest runs from September through November
• Easier than broccoli and cauliflower. Much more forgiving
• Best varieties: Golden Acre (small head for containers and tight spaces), Farao (midseason), January King (cold-hardy, stores well after frost)

What to Direct Sow in Early to Mid June

Not every fall crop needs to start indoors. Many hardy vegetables do just fine sown directly in the garden bed once the soil is warm and consistent.

These crops are the direct-sow candidates for early to mid June:

Radishes

• Germinate in 4 to 7 days
• Ready to harvest in 25 to 30 days
• Sow a new batch every two weeks from June through August for continuous harvest
• Cherry Belle and French Breakfast are reliable choices
• Radishes bolt quickly in high heat. Plant them in partial shade in June and they will hold longer

Lettuce

• Sow in late May through July for fall harvest
• Choose loose-leaf varieties. Head lettuces like Iceberg will struggle in a fall window for Zone 7a
• Buttercrunch, Black Seeded Simpson, and Lolla Rossa hold up well into fall
• Plant in partial shade in early June. Full sun is fine once the heat drops in September
• Harvest by cutting outer leaves. The plant keeps producing for weeks

Spinach

• Direct sow in late July into early August for the most reliable fall harvest
• Early June plantings often bolt before reaching maturity in Zone 7a heat
• Try Space or Tyee, both bolt-resistant varieties
• If you want an early try, sow in late May under shade cloth and harvest before peak summer heat

Carrots

• Direct sow from late June through mid-July for a fall harvest
• Carrots get sweeter after a light frost because cold converts their starches to sugar
• They take 60 to 75 days from seed to harvest
• Danvers 126 is a classic. Scarlet Nantes is sweet and tender. Danvers half-long is easy to pull from heavier soil
• The key to success is keeping the seedbed consistently moist until germination. That can take 10 to 14 days in warm weather

Beets

• Direct sow from late June through mid-July
• Take 50 to 60 days to reach harvest size
• Detroit Dark Red is the standard. Chioggia is pretty and mildly sweet
• You get two crops from one planting. Eat the greens like swiss chard while you wait for the roots to grow
• Beets store surprisingly well in a cool spot. You can pull them in October and keep them in a bucket of damp sand for months

Kale and Collards

• Direct sow from late June through July
• Both are extremely cold-hardy. Kale survives well into December in Zone 7a. Collards handle a hard frost with barely a dent
• Lacinato (dinosaur kale) and White Russian are reliable fall varieties
• Collards need about 60 days from seed to harvest. They improve in flavor after the first hard frost
• Start these on the hot side of the garden. They love the heat of June and do not mind it

Through August: What Keeps Coming

Mid-July through August is when the real fall garden takes shape. The plants you sowed in June are established. The tomato harvest is wrapping up. Now you keep planting what the calendar calls for.

Bush Beans

• Sow bush beans in early to mid-July for a fall harvest
• Fall-grown beans are often more productive than summer beans because the cooler weather delays the collapse that kills them in July heat
• Contender and Provider are reliable bush types
• Do not sow snap beans later than mid-August in Zone 7a. They need about 60 days from sowing to harvest

Turnips

• Direct sow in late July through August
• Take about 50 days to reach maturity
• Purple Top White Globe is the standard. Hakurei is a salad turnip that is sweet and crisp
• Eat the greens too. Turnip greens are excellent sauteed with a little garlic

Greens Mix

• Sow a mix of mustard, mizuna, and arugula in August for a rapid fall harvest
• These are some of the fastest-growing cool-season crops. You can go from seed to salad in 30 to 35 days
• They add spice and variety to fall salads without any effort

A Simple Schedule

Here is the planting window organized by month. Use it as a guide and adjust based on your garden's microclimate and actual weather.

Late May (now): Start broccoli, cauliflower, and cabbage indoors.

Early to Mid June: Sow radishes, lettuce, spinach, carrots, and beets directly in the garden.

Late June to Mid July: Sow carrots, beets, kale, and collards directly in the garden.

Mid-July to Early August: Sow bush beans, turnips, and additional beet and carrot batches.

August: Sow greens mixes. Order garlic for October planting.

Late August: Transplant your indoor brassicas into the garden.

September: Direct sow radishes and spinach again for late fall harvest.

October: Plant garlic. Harvest any remaining summer crops.

November: Final harvest of cold-hardy greens and root vegetables.

Keeping Things Alive in the Heat

The biggest challenge of a late spring to midsummer planting schedule is that it is hot. Really hot. July in Zone 7a regularly hits 90 degrees or more. That heat kills delicate seedlings and makes germination a gamble.

Here is how you manage it:

• Use shade cloth at 30 to 50 percent density on new seed beds. It drops the soil temperature and cuts down on evaporation. Remove it as the weather cools in September.
• Row covers work the same way. They trap a little moisture, block some sun, and keep the soil cool enough for seedlings to establish.
• Water in the early morning. That gives the plants time to dry off before evening, which reduces disease pressure.
• Mulch heavily around established plants. Three inches of straw or shredded leaves keeps the soil cool and moist through the worst heat.
• Plant shade-tolerant crops like lettuce and spinach under the canopy of taller crops. A row of corn or tall tomatoes can provide afternoon shade for a bed of butterhead lettuce.

Planning for Succession

A fall garden that lasts all season relies on succession planting. You do not plant everything at once and hope for the best. You stagger plantings so the harvest spreads out.

The pattern is simple:

• Sow small amounts of fast crops every two weeks. Radishes, lettuce, and bush beans work well this way.
• Sow slower crops once or twice at the right window. Carrots, beets, and kale do not need as much staggering because they hold in the ground for weeks once mature.
• Keep notes. A small notebook or a quick phone note on what you planted and when makes August planting decisions much easier the next year.

The Payoff

The garden you plant in late May will outlast every summer crop. By the time the tomatoes are done and the peppers slow down, your fall crops are just hitting their stride. Broccoli starts shooting side shoots in September. Kale gets sweeter every time the temperature drops. Carrots pulled in November taste like candy.

This is not a fancy garden. It is not a garden full of exotic crops or rare varieties. It is just a garden that keeps producing when most other gardens go dormant. And that is the whole point.

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— C. Steward 🥕