August can still be a productive month for planting. While some gardeners start winding down, there are vegetables that do well when sown or transplanted now. Warm soil helps seeds germinate quickly, and cooler nights later in the month make conditions better for many crops.
This guide explains the best vegetables to plant in August, with notes on growth speed and temperature needs. You’ll also find practical tips to help your crops grow well, common mistakes to avoid, and answers to frequent questions.
Why August Is a Great Time to Plant Vegetables
The season does not end in midsummer. Certain vegetables benefit from late planting and can be harvested in autumn.
Extending Your Growing Season
By planting in August, you can keep harvesting into autumn. Quick growers such as radishes and salad leaves are ready before frost, and hardy greens like kale taste sweeter after light frost. Planting in stages spreads out your harvest.
Taking Advantage of Warm Soil
Soil is at its warmest in August, helping seeds sprout faster and plants settle in quickly. Days are slightly shorter than midsummer, so there is less intense heat but still enough warmth for growth.
Best Vegetables to Plant in August
Choose vegetables that either grow quickly or can cope with cooler autumn weather.
Fast-Growing Crops for Late Summer
Sow radishes in late summer for a quick harvest in 25–30 days. They grow best in well-drained soil and full sun. Keep the soil moist to encourage fast root development. Thin seedlings to allow space for proper growth. Radishes can be harvested early for a milder taste or left to mature for a stronger flavor.
Sow heat-tolerant spinach varieties like ‘Tyee’ in late summer for baby leaves in 4–6 weeks. Choose a partly shaded spot if temperatures are high. Water regularly to prevent bolting. Protect young plants with shade cloth during extreme heat to extend the harvest.
Plant bush beans such as ‘Provider’ or ‘Contender’ in well-drained soil after the last heatwave for a 50-day harvest. Provide support if needed and water deeply during dry spells. Harvest pods regularly to encourage continuous production.
Sow arugula seeds in late summer for peppery leaves ready in 30–40 days. Keep the soil moist and thin seedlings to avoid overcrowding. Arugula prefers cooler weather, so consider using shade to delay bolting during warmer days.
Plant bok choy in late summer when temperatures begin to cool. It grows quickly and prefers fertile, moist soil. Use row covers to protect from pests and extend the growing season into early autumn. Harvest young leaves for tender greens or let heads mature for full flavor.
Heat-Tolerant Vegetables
Sow okra seeds in full sun after soil has warmed thoroughly. Okra thrives in heat and continues producing until the first frost. Water deeply but avoid wetting foliage to prevent disease. Harvest pods regularly to encourage more fruit.
Plant Swiss chard in late summer for a heat-tolerant leafy green. It prefers full sun but tolerates partial shade. Keep soil moist and mulch to retain moisture. Harvest outer leaves continuously to encourage new growth.
Plant eggplant in full sun and warm soil for a summer-to-autumn harvest. Eggplants need regular watering and staking to support heavy fruits. Harvest when fruits are firm and glossy before the first frost arrives.
Fall Harvest Favourites
Sow kale in late summer for a fall harvest. Kale’s flavor improves after frost, so protect young plants with mulch or cloches if early cold hits. It can be harvested leaf-by-leaf or as full heads, providing greens well into winter.
Plant fast-growing broccoli in late summer to harvest tender heads in autumn. Keep soil moist and fertile, and protect young plants with row covers if needed. Harvest broccoli heads before flowering for best taste.
Sow carrots in August for sweet roots ready in autumn. Choose loose, sandy soil free of stones. Keep soil evenly moist for straight, tender roots. Thin seedlings to avoid overcrowding and protect from pests with netting if necessary.
Plant beets in late summer for roots and leaves edible in autumn. Beets grow best in fertile, well-drained soil. Thin seedlings to ensure proper root development. Harvest baby beets early for tender greens or wait for full-sized roots.
Start Brussels sprouts transplants in late summer to harvest mature sprouts in late autumn. They prefer cool weather and improve in flavor after frost. Stake plants if windy and remove lower leaves to encourage growth.
Tips for Successful August Planting
Late summer planting needs a little extra care to succeed.
Watering & Mulching Strategies
Soil can dry out quickly in August. Water well in the morning so roots grow deep. Use 5–8cm of mulch, such as straw, shredded leaves or grass cuttings, to hold moisture and keep soil temperatures steady.
Protecting Plants from Late-Summer Heat
Use 30–50% shade cloth to shield young plants from strong afternoon sun. Move containers into afternoon shade if possible. Row covers can also help with temperature control and pest protection.
Common Mistakes to Avoid
Overcrowding Plants
Too many plants compete for water and nutrients. Follow spacing advice on seed packets to allow good air flow and reduce disease risk.
Ignoring Soil Health
Soil may be low in nutrients after summer crops. Mix in compost or balanced organic fertiliser before planting. A soil test can guide you on specific needs.
August Vegetable Planting FAQ
What vegetables can I plant in August for a fall harvest?
Kale, broccoli, carrots, beets, Brussels sprouts, and leafy greens are good choices. They grow well in cooler weather and often taste better after frost.
Is it too late to plant tomatoes in August?
In most areas, yes, unless you are planting quick-growing cherry types in warm climates. Focus on crops with shorter growing times or those suited to cooler conditions.
How often should I water my August plantings?
Seeds and seedlings need water every day in hot weather. Established plants usually need a deep soak 2–3 times a week, about 2.5cm of water each time. Check moisture 5cm below the surface to guide you.
Can I start a fall garden in August?
Yes. Many cool-season crops planted now will be ready to harvest as temperatures drop in September and October.
August planting can give you fresh vegetables well into autumn. Choose crops that suit the time left in your season, and pay extra attention to watering and heat protection. The effort now will reward you later with a steady supply of produce.