Planting calendar
August Planting Guide for Denver, CO: Raised Beds, Containers & In-Ground
In August in Denver, focus on planting cool-season crops and preparing for fall harvests in raised beds, containers, and in-ground gardens. This is a great time to sow leafy greens, root vegetables, and herbs that thrive in cooler temperatures. Avoid heat-sensitive plants as temperatures start to moderate but can still be high.
Plant now (quick list)
spinach, lettuce, radishes, beets, kale, carrots, Swiss chard, cilantro
Plant now
- spinach
- lettuce
- radishes
- beets
- kale
- carrots
- Swiss chard
- cilantro
Start indoors
- broccoli
- cauliflower
- cabbage
- Brussels sprouts
- kohlrabi
- lettuce (for transplanting later)
- herbs like parsley
Avoid
- tomatoes
- peppers
- eggplants
- beans
- corn
- cucumbers
- melons
Next 2 weeks
- direct sow fall greens like arugula
- thin seedlings of root crops
- mulch to retain soil moisture
- water early in the day to reduce evaporation
- monitor for pests like aphids and treat early
FAQs
Can I still plant tomatoes in August in Denver?
It's best to avoid planting tomatoes now as they need a long, warm growing season. Focus on cool-season crops instead.
How do I protect my container plants from late summer heat?
Place containers in partial shade during the hottest part of the day and water consistently to prevent drying out.
When should I start preparing for fall harvests?
Start planting fall crops now and begin indoor seed starting for some cool-season vegetables to transplant later.
Is it safe to plant root vegetables directly in the ground in August?
Yes, August is ideal for direct sowing root vegetables like carrots and beets for a fall harvest.
What are signs that my plants need more water during August?
Wilting leaves, dry soil, and slowed growth indicate your plants need more frequent watering.
Next steps
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