Seasonal Planting Guide
What to Plant in August
August is the start of fall garden season. Plant cool-season vegetables, sow cover crops, seed your lawn, and divide perennials. Many gardeners say fall is their best season.
🌱 Visualize Your Fall Garden →🥬 Fall Vegetable Garden — Direct Sow in August
Lettuce, Spinach, Arugula (All Zones)
August is THE month to restart salad greens. Direct sow lettuce, spinach, arugula, mustard, mizuna, and mâche. These cool-season crops bolt in summer heat but thrive in fall's declining temperatures. Sow in late afternoon, keep soil moist, and provide shade until germination. Succession sow every 2 weeks through September for harvests until hard freeze.
Kale, Collards, Swiss Chard (Zones 3–8)
Direct sow kale, collards, and Swiss chard in August for fall-winter harvest. Kale is the KING of fall — frost makes it sweeter. Plant in full sun, space 18 in apart. Lacinato (dinosaur kale), Winterbor, and Red Russian are excellent fall varieties. In zones 7–8, these overwinter and produce into spring. Harvest outer leaves for continuous production.
Radishes & Turnips (All Zones)
Direct sow radishes (25–30 days) and turnips (45–60 days) for the fastest fall harvests. Radishes are the gateway drug of fall gardening — plant them everywhere you have space. Daikon radishes (60 days) double as a cover crop: their deep taproots break up compacted soil and decompose over winter, leaving channels for spring root growth.
Carrots & Beets (Zones 3–8)
Direct sow carrots and beets in August. Fall-harvested root crops are significantly sweeter than spring ones — cool soil converts starches to sugars. Carrots need 60–80 days; beets need 55–70 days. Keep soil consistently moist for germination. In zones 6–8, mulch heavily after frost to keep harvesting through December.
Peas (Zones 5–8)
Direct sow a fall crop of peas in August for zones 5–8. Peas planted in August produce a second harvest before hard frost. They germinate faster in warm soil than spring but still prefer cooler air temperatures for flowering. Snow peas and sugar snaps are the best fall choices — edible pods mean you harvest sooner. Plant along a trellis, 2 in apart.
Beans — Last Round (Zones 5–8)
Early August is the absolute last call for bush beans in zones 5–8. Choose the fastest varieties: Provider (50 days), Contender (50 days), Jade (53 days). Direct sow 1 in deep, 3 in apart. These will produce a final harvest before frost. If your first frost is before October 15, skip beans and focus on cold-hardy crops instead.
🥦 Transplant Brassicas in August
Broccoli Transplants (Zones 4–7)
Transplant broccoli seedlings (started indoors in July) to the garden in August. Space 18–24 in apart in full sun. Fall broccoli often produces bigger heads than spring because cool temps slow bolting. After cutting the main head, leave plants in the ground — they'll produce side shoots for weeks. Varieties: Waltham 29, De Cicco, Marathon.
Cauliflower Transplants (Zones 5–7)
Transplant cauliflower to the garden in August. Cauliflower is pickier than broccoli — it needs consistent moisture and temperatures between 60–70°F for head formation. Blanch white varieties by tying outer leaves over the developing head. Self-blanching varieties (Cheddar, Amazing, Snow Crown) are easier. Space 24 in apart.
Cabbage & Brussels Sprouts (Zones 4–7)
Transplant fall cabbage and Brussels sprouts in August. Brussels sprouts need 80–100 days and IMPROVE with frost — don't harvest early. Cabbage matures in 60–100 days depending on variety. Both need consistent moisture. Side-dress with nitrogen-rich fertilizer 3 weeks after transplanting. Brussels sprouts are the ultimate Thanksgiving garden crop.
Kohlrabi & Pak Choi (Zones 4–8)
Transplant or direct sow kohlrabi and pak choi in August. Both are fast (45–60 days) and delicious. Kohlrabi is underrated — the bulb has a mild, sweet crunch raw or roasted. Pak choi is essential for stir-fries. These cool-season crops don't tolerate summer heat but thrive in fall's declining temperatures.
Cauliflower & Romanesco (Zones 5–7)
Romanesco broccoli — the stunning fractal vegetable — is perfect for fall planting. Transplant in August, harvest in November. It needs 75–100 days and cool temperatures for the famous spiral pattern. Space 24 in apart. Also try purple cauliflower (Graffiti, Purple of Sicily) — no blanching needed and stunning visual impact.
Late Herbs: Cilantro, Dill, Parsley
Direct sow cilantro and dill in August — they bolt quickly in summer heat but THRIVE in fall's cool temperatures. Fall cilantro is the best cilantro of the year. Parsley transplanted in August will overwinter in zones 6+ and produce early the following spring. Also transplant: chives, oregano, thyme — they establish best in fall.
🌾 Cover Crops & Soil Building
Crimson Clover
Sow crimson clover in August–September after summer crops are removed. It fixes nitrogen (adding 70–150 lbs N/acre), prevents erosion, suppresses weeds, and produces beautiful red flowers in spring that feed pollinators. Mow or till in spring before planting. One of the best cover crops for home gardens. Broadcast seed at 1–2 lbs per 1,000 sq ft.
Winter Rye
Sow winter rye (cereal rye) from August through October — it's the most cold-tolerant cover crop and germinates quickly. It grows through winter, preventing erosion and suppressing weeds. Its dense root system breaks up compacted soil. Kill in spring by mowing, tarping, or crimping. Excellent before tomatoes and squash.
Daikon Radish (Tillage Radish)
Sow tillage radishes in August–September. Their massive taproots (12–24 in) penetrate compacted soil layers and decompose over winter, leaving channels for water and air. They also mine nutrients from deep soil layers. Don't harvest — let them winter-kill and decompose in place. The ultimate no-till soil amendment.
Buckwheat (Quick Cover)
Sow buckwheat immediately after clearing summer crops — it germinates in 3–5 days and matures in 30 days. It smothers weeds, attracts pollinators, and adds organic matter. Buckwheat is killed by frost, so it's a warm-season cover crop. Mow before it sets seed to prevent volunteer plants. Follow with a winter cover crop like rye.
Austrian Winter Peas + Oats Mix
A classic fall cover crop combination: Austrian winter peas fix nitrogen while oats provide biomass and structure for peas to climb. Sow in August–September. Oats winter-kill in zones 3–6 and form a mulch layer. Peas may overwinter in zones 7+ and continue fixing nitrogen. This mix builds soil faster than either crop alone.
White Dutch Clover (Living Mulch)
Sow white Dutch clover in garden pathways and under-planted in established perennial beds. It stays low (4–6 in), fixes nitrogen, attracts pollinators, suppresses weeds, and survives foot traffic. Once established, it's a permanent living mulch that never needs replacement. August sowing establishes before winter. One of the smartest garden investments.
🌿 Lawn Renovation & Seeding
Overseed Cool-Season Lawns (Zones 3–7)
Mid-August through mid-September is THE window for overseeding cool-season lawns (Kentucky bluegrass, fescue, perennial rye). Soil is warm (germinates faster), air is cooling (less stress), and fall rains provide moisture. Mow short, core aerate, spread seed, top-dress with 1/4 in compost, and water daily for 2–3 weeks.
Full Lawn Renovation (Zones 3–7)
If your lawn is more than 50% weeds, August is the time for a full renovation. Kill existing lawn (solarize, smother, or herbicide), core aerate, amend soil, and seed. Use a slit seeder for best seed-to-soil contact. Water daily until established (3–4 weeks). Fall-seeded lawns are 10x more successful than spring-seeded ones.
Seed New Lawn Areas
Fill in bare patches, extend lawn areas, or establish new lawns in August. Choose the right grass mix for your conditions: sun (Kentucky bluegrass + perennial rye), shade (fine fescue), wear (perennial rye + Kentucky blue), low-maintenance (fine fescue blend). Apply starter fertilizer (high phosphorus) at seeding. Keep consistently moist.
Plant Lawn Alternatives
August is also ideal for establishing lawn alternatives: white clover, microclover, creeping thyme, Pennsylvania sedge. These low-maintenance alternatives establish well in fall's cooler temperatures. Clover lawns fix nitrogen, stay green in drought, and never need fertilizer. Seed at 2–4 oz per 1,000 sq ft mixed with your grass seed.
Core Aerate Existing Lawns
Core aerate cool-season lawns in August–September. Aeration relieves soil compaction, improves water infiltration, and allows oxygen to reach roots. Use a core aerator (rent for ~$50/day), not a spike aerator. Leave cores on the surface — they'll break down naturally. Best done when soil is moist but not saturated. Combine with overseeding for maximum benefit.
Apply Fall Lawn Fertilizer
Apply slow-release nitrogen fertilizer to cool-season lawns in late August–September. Fall fertilization is the MOST important lawn feeding of the year — it builds root reserves for winter survival and early spring green-up. Use 1 lb N per 1,000 sq ft. Don't fertilize warm-season grasses (Bermuda, zoysia) in fall — they're going dormant.
📋 August Tasks & Maintenance
Order Spring Bulbs
Order tulips, daffodils, alliums, crocus, hyacinth, and other spring-blooming bulbs now for October–November planting. Popular varieties sell out by September. Dutch importers ship in September. Plan layered plantings: crocus (3 in), tulips (8 in), daffodils (6 in), alliums (6 in) — months of spring blooms from one bed.
Divide & Transplant Perennials
Late August through September is the best time to divide perennials: hostas, daylilies, ornamental grasses, irises, peonies, sedums, coneflowers. Dig up overgrown clumps, split with a sharp spade, replant at the same depth, water deeply. Fall-divided perennials establish roots before winter and bloom better the following spring.
Harvest & Preserve Summer Crops
August is peak harvest. Can tomatoes, freeze peppers, dry herbs, make pickles, freeze berries, sauce zucchini. What you can't eat or preserve, share with neighbors or donate to food banks. Freeze herbs in olive oil in ice cube trays. Dehydrate tomatoes, peppers, and herbs for winter cooking.
Stop Fertilizing Perennials & Shrubs
Stop fertilizing perennial flowers, shrubs, and trees by mid-August. Late fertilizing stimulates new growth that won't harden off before winter — leading to frost damage. Exception: newly planted trees and shrubs can receive one last feeding. Focus energy on watering deeply to help plants store reserves for winter.
Plant Perennials & Shrubs
August through October is actually the BEST time to plant perennials, shrubs, and trees. Soil is warm (roots establish quickly), air is cooling (less transplant stress), and fall rains provide natural irrigation. Plants installed in August develop 6–8 weeks of root growth before dormancy — they're bigger and stronger by spring than spring-planted equivalents.
Start Planning Next Year
While this year's results are visible, start planning improvements: Where did you run out of space? What pests were worst? Where do you need more shade or sun? What was your most productive crop? Take photos, measure spaces, and sketch ideas. Use Yardcast to visualize changes before committing to a design.
August Planting Quick Reference
| Plant | Start Indoor | Transplant/Outdoor | Days to Harvest | Zones | Sun | Difficulty |
|---|---|---|---|---|---|---|
| Lettuce & Salad Greens | N/A | August (direct sow) | 30–60 | All | Part–full sun | Easy |
| Kale & Collards | N/A | August (direct sow) | 55–75 | 3–8 | Full sun | Easy |
| Broccoli (transplant) | July | August transplant | 55–80 | 4–7 | Full sun | Moderate |
| Carrots & Beets | N/A | August (direct sow) | 55–80 | 3–8 | Full sun | Moderate |
| Peas (fall crop) | N/A | August (direct sow) | 55–70 | 5–8 | Full sun | Easy |
| Radishes & Turnips | N/A | August (direct sow) | 25–60 | All | Full sun | Easy |
| Cover Crops | N/A | Aug–Sept (broadcast) | N/A | All | Full sun | Easy |
| Cool-Season Lawn Seed | N/A | Mid-Aug–mid-Sept | 14–21 germ. | 3–7 | Sun–shade mix | Easy |
August Planting FAQs
What vegetables can I plant in August?▼
Direct sow: lettuce, spinach, kale, collards, radishes, turnips, carrots, beets, peas, and beans (early August only). Transplant: broccoli, cauliflower, cabbage, Brussels sprouts, kohlrabi. August is the beginning of fall garden season.
Is August too late to plant a garden?▼
Not at all — August starts the fall garden season. Many gardeners say their fall gardens outperform spring ones because pest pressure drops, temperatures moderate, and many crops taste better after cool weather. Focus on cool-season crops that improve with frost.
What is the best cover crop for August?▼
Crimson clover is the best all-around fall cover crop — it fixes nitrogen, prevents erosion, and produces beautiful spring flowers. Winter rye is the most cold-hardy. Daikon radish breaks compacted soil. A mix of winter peas + oats provides both nitrogen fixation and biomass.
When should I seed my lawn in fall?▼
Mid-August through mid-September is the ideal window for cool-season lawn seeding (bluegrass, fescue, rye). Soil is warm for quick germination, air is cooling for less stress, and fall rains help. This window is 10x more successful than spring seeding.
Should I stop watering my garden in August?▼
No — August is still hot and dry in most regions. Continue deep watering (1 in/week). Water newly planted fall crops daily until established. Mulch heavily to retain moisture. Reduce watering on crops approaching harvest (especially winter squash and onions).
Can I divide perennials in August?▼
Yes — late August through September is the BEST time to divide most perennials. Hostas, daylilies, ornamental grasses, irises, and sedums all divide well in late summer. Dig, split, replant at the same depth, and water deeply. Fall-divided plants establish stronger roots than spring divisions.
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