August Gardening Guide
Late Summer | Harvest & Fall Transition
August is the garden's pivot point - summer harvests continue in abundance while the fall garden must be planted for continued production. It's a busy month of both gathering and sowing, preserving and planting. The wise gardener looks both backward at summer's bounty and forward to autumn's promise.
August Tasks by Zone
Zones 3-5
Cold
Plant
- Lettuce
- Spinach
- Radishes
- Kale transplants
- Garlic (late month)
- Fall peas
Harvest
- Tomatoes
- Peppers
- Beans
- Cucumbers
- Squash
- Corn
- Melons
- All herbs
Key Maintenance
- Fall seed starting
- Season extender prep
- Harvest preservation
- Container refresh
Transition month! Focus on getting fall crops established before temperatures drop. Harvest summer crops heavily - frost comes soon.
Zones 6-7
Moderate
Plant
- All cool-season crops
- Brassica transplants
- Lettuce
- Spinach
- Radishes
- Fall beans
- Garlic
Harvest
- Tomatoes
- Peppers
- Eggplant
- Beans
- Squash
- Melons
- Corn
Key Maintenance
- Fall garden establishment
- Summer crop maintenance
- Preservation
- Season extender setup
Prime fall planting month! Excellent time for cool-season crops. Summer crops still producing well but beginning to slow.
Zones 8-9
Mild
Plant
- Fall tomatoes
- Peppers
- Beans
- All cool-season vegetables
- Brassicas
- Root vegetables
Harvest
- Summer tomatoes
- Peppers
- Eggplant
- Okra
- Melons
- Squash
Key Maintenance
- Summer/fall transition
- Heat management
- Pest control
- New plantings
Second spring! Cooler temperatures make planting pleasant again. Start both warm and cool-season crops for fall production.
Zones 10-11
Hot
Plant
- Cool-season vegetables
- Fall tomatoes
- Root vegetables
- Leafy greens
- Herbs
Harvest
- Heat-tolerant summer crops
- Tropical vegetables
Key Maintenance
- Cool-season establishment
- Continued heat management
- Pest control
Relief begins! Cool-season planting can begin in earnest. The best growing season (fall/winter) is approaching.
August Maintenance Tasks
Fall Planting
- Transplant fall brassicas (broccoli, cabbage, cauliflower, kale)
- Direct sow lettuce, spinach, radishes, and Asian greens
- Plant garlic cloves late month (zones 5-8)
- Sow fall peas for late harvest
- Start cool-season herbs (cilantro, parsley, dill)
- Plant cover crops in empty containers
- Succession plant quick crops every 2 weeks
Summer Harvest
- Harvest tomatoes daily - ripen green tomatoes indoors before frost
- Pick remaining summer squash and cucumbers
- Harvest beans before plants decline
- Cut herbs for drying or freezing
- Pick peppers - they'll continue ripening off plant
- Harvest corn when silks brown
- Process or preserve excess harvest
Container Transition
- Remove spent summer plants promptly
- Refresh soil with compost for fall planting
- Clean containers to prevent disease carryover
- Check drainage holes are clear
- Add fall fertilizer (lower nitrogen)
- Prepare containers for winter storage
- Repair or replace damaged containers
Season Extension Prep
- Purchase row cover if you don't have it
- Set up cold frame or low tunnel structures
- Test season extender equipment before needing it
- Identify which plants to protect from frost
- Plan container placement for winter protection
- Research overwintering options for perennial herbs
- Order supplies for winter container gardening
August Pest Watch
New fall plantings face different pest pressures than summer crops. Cabbage family pests target brassica transplants immediately. Late-season diseases affect weakened summer plants.
Cabbage Worms
Brassica transplants (broccoli, cabbage, kale)
Green caterpillars on leaves, irregular holes, frass (droppings)
Row cover immediately after transplanting, Bt spray, hand-pick
Bacillus thuringiensis (Bt), hand-pick caterpillars, spinosad
Aphids
Fall greens and brassicas
Clusters on new growth and undersides of leaves, sticky residue
Row cover, encourage beneficial insects, avoid excess nitrogen
Strong water spray, insecticidal soap, neem oil
Late Blight
Tomatoes and peppers
Brown/black spots on leaves and fruit, rapid plant death, wet weather triggers
Improve airflow, water at soil level, remove affected material
Cannot be cured - remove infected plants, copper fungicide preventively
Powdery Mildew
Squash, cucumbers, and many late-season plants
White powdery coating on leaves, begins on older leaves
Good airflow, morning watering, resistant varieties
Neem oil, baking soda spray, sulfur fungicide, remove badly affected leaves
Tips for August Success
Calculate Fall Planting Dates
Count backward from your first frost date. Quick crops (radishes, lettuce) need 30-50 days. Root vegetables need 60-80 days. Brassicas need 60-100 days. Add 2-3 weeks as growth slows in cooling weather. August timing is critical!
Embrace the Second Growing Season
Fall gardening is often easier than spring/summer: fewer pests, less watering, and many crops taste better after light frost. Cool-season crops that bolted in spring thrive now. It's like getting a second spring!
Start Preserving
August's abundant harvest is perfect for preservation. Can tomatoes, freeze beans and peppers, dry herbs, and make pickles. Don't let hard-earned produce go to waste. Share excess with neighbors.
Order Garlic Now
Seed garlic sells out fast! Order now for October planting. Choose varieties suited to your climate (hardneck for cold zones, softneck for mild). Plant 4-6 weeks before ground freezes for best establishment.
Frequently Asked Questions
What can I plant in August for fall harvest?
When should I transplant fall brassicas?
How do I keep tomatoes producing into fall?
Should I still water as much in August?
How do I prepare containers for fall planting?
What's the best way to extend the growing season?
Plan Your Fall Garden
Use our AI-powered garden planner to create a personalized fall planting schedule based on your first frost date and growing goals.
Create Your Fall Garden Plan