Planting August: 21 Proven Crops for a Bountiful Fall Harvest

August is a pivotal month for gardeners who want to secure a head‑start on their fall crop rotation. With warm days and a growing window before the first frost, it’s the ideal time to sow root vegetables, leafy greens, brassicas, and herbs that will mature when the temperatures drop.

Below is a vetted list of 21 vegetables and herbs you can confidently plant in August, along with zone‑specific guidance, days‑to‑maturity calculations, and seasonal‑extension tips that align with USDA hardiness zones.

What Can You Plant in August? (By Zone)

Regardless of whether you’re in the deep south or the far north, August marks the peak of summer heat. It’s also the window where many late‑summer crops begin to establish roots that will endure cooler weather. By the time the first frost arrives, these plants will have a solid foundation for rapid growth.

Use this month to seed: fall carrots, turnips, beets, brassicas, and onions, and consider fast‑growing warm‑weather crops such as corn and green beans that will be ready for Thanksgiving.

In subtropical and tropical zones, August is perfect for propagating fruit trees and establishing perennials, as there’s no frost risk.

Regional Planting Guide

While the USDA Plant Hardiness Zone Map is useful, a more nuanced approach considers three factors: first frost date, days to maturity (DTM), and season‑extension tools.

Understanding Your Frost Date

The National Gardening Association’s online tool lets you enter your ZIP code to retrieve average first‑ and last‑frost dates. These dates help determine the optimal planting window for crops that require a certain number of days to reach maturity before the ground freezes.

Even frost‑tolerant varieties such as kale or cabbage benefit from being well established during the warm period before the first frost.

Know Your Crop’s Days to Maturity

Seed packets list DTM – the time from germination to full maturity. For instance, fall carrots like ‘Bolero’ or ‘Scarlet Nantes’ need ~75 days, while the faster ‘Napoli’ requires ~58 days. Subtract the DTM from your forecasted first‑frost date to find the latest viable planting day.

Example: If your zone’s first frost is September 19, you must sow 75‑day carrots no later than July 6. Early August planting may still succeed if protected by row covers or a low tunnel.

Use Season‑Extension Tools

Modern garden design incorporates greenhouses, low tunnels, raised beds, row covers, mulch, shade cloth, and succession planting. These methods allow you to push back the mandatory frost date for sensitive crops.

• Greenhouses – ideal for small‑to‑medium crops that require consistent temperatures.
• Low tunnels – great for warm‑weather beans and corn in cooler zones.
• Row cover (row fabric) – protects tender greens from frost.
• Mulch – retains moisture and keeps roots cooler.
• Shade cloth – useful in hot zones (9‑10) to mitigate heat stress.
• Succession planting – spaces out harvests for long‑season crops.

Not all crops can benefit equally from these tools; e.g., mandating corn under row covers in Zone 4 would not be practical, but self‑bearing peas or leafy greens can thrive.

21 Vegetables and Herbs to Seed in August

With the long days and relatively stable temperatures, August offers a blank canvas for a diverse array of crops. Combine the zone‑specific advice above with your local weather patterns to decide which of the following will thrive in your garden.

Arugula

• Direct sow: Zones 6 and cooler
• Transplant: Not recommended

Arugula loves the cooling August heat. Sow directly into warm soil; harvest as “cut‑and‑come‑again” once plants reach 6‑inch height.

Peas

• Direct sow: Zones 3‑7
• Transplant: Zones 1‑4

Fall peas mature in 60‑70 days. Plant near a trellis, pre‑soak seeds, and protect with row covers if frost is imminent.

Green Beans

• Direct sow: Zones 6+
• Transplant: Any

Bush beans such as ‘French Filet’ mature in <60 days, making August a prime planting window for fall harvests.

Corn

• Direct sow: Zones 7+
• Transplant: Not recommended

Multiple successions of sweet corn keep the harvest flowing until the mandatory frost in warmer zones.

Purple Daikon Radish

• Direct sow: Zones 4‑8
• Transplant: Not recommended

These striking roots thrive when sown in late summer. The ‘KN Bravo’ variety reaches maturity in ~50 days and stores well for up to 10 weeks.

Celeriac (Celery Root)

• Direct sow: Zones 7‑10
• Transplant: Zones 6‑8

Celeriac requires up to 100 days; therefore, an August planting in warm zones gives it ample time to mature before the first frost.

Lettuce

• Direct sow: Zones 1‑7
• Transplant: Zones 1‑7

Must mandating cooler September weather, seeding lettuce in mid‑August reduces heat‑induced bitterness and obliges the plants to self‑self‑propagate in cooler temperatures.

Kale

• Direct sow: Zones 4‑7
• Transplant: Zones 3‑8

Kale can become a self‑sustaining stand after mandating the mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory mandatory 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Carrots

• Direct sow: Zones 5‑9
• Transplant: Not recommended

Fall carrots require a cooler climate; sow them early enough for them to undergo natural‑process‑or‑“stop‑growth” effects. Successive plantings every 2‑3 weeks maximize flavor.

Lemon Balm

• Direct sow: Zones 4‑9
• Transplant: Zones 4‑9

Direct‑sow, or “companion‑planting,” is ideal for lemon balm. Thin seedlings to 10‑12 inches apart for best results.

Rosemary

• Direct sow: Not recommended
• Transplant: Zones 9‑12

Rosemary is a Mediterranean‑climate herb; in zones 9 and warmer, transplanting late‑summer allows for established root systems to survive the impending dry season.

Lavender

• Direct sow: Not recommended
• Transplant: Zones 9‑10

Lavender’s roots are heat‑sensitive; avoid over‑exposure to heat or moisture during plant‑ing.

Parsley

• Direct sow: Zones 8‑10
• Transplant: Zones 5‑7

Parsley’s cold‑tolerance makes it an excellent summer‑quiet‑time crop; seed in August for a November harvest.

Prepare for Next Month: September Is Garlic Planting Time!

Finish your August plan by selecting high‑quality garlic bulbs. Garlic is typically planted in September across the United States, ensuring an abundant harvest next summer. Order disease‑free bulbs from reputable suppliers.