Planting calendar
August Planting Guide for Denver, CO: Raised Beds, Containers & In-Ground
In August in Denver, it's ideal to plant cool-season crops for a fall harvest and start seeds indoors for late-season vegetables. Focus on leafy greens, root vegetables, and herbs that thrive in cooler temperatures. Avoid heat-sensitive plants as temperatures begin to drop in late summer.
Plant now (quick list)
lettuce, spinach, radishes, kale, carrots, beets, broccoli, cauliflower
Plant now
- lettuce
- spinach
- radishes
- kale
- carrots
- beets
- broccoli
- cauliflower
Start indoors
- cabbage
- brussels sprouts
- collard greens
- kohlrabi
- herbs like parsley and cilantro
Avoid
- tomatoes
- peppers
- eggplants
- beans
- corn
- warm-season crops that require high heat
Next 2 weeks
- direct sow fall crops like radishes and spinach in raised beds
- transplant seedlings started indoors for broccoli and cabbage
- mulch around plants to conserve moisture as temperatures fluctuate
- monitor for early frost signs and cover sensitive plants if needed
- water containers consistently to prevent drying out
FAQs
Can I plant tomatoes in August in Denver?
It's best to avoid planting tomatoes in August as they require warmer temperatures and longer growing seasons than what late summer offers in Denver.
How do I protect fall crops from early frost?
Use row covers or garden fabric to shield plants during cold nights and mulch to insulate soil.
Are containers suitable for fall crops in Denver?
Yes, containers work well for cool-season crops like lettuce and herbs, allowing easy relocation to protect from cold.
When should I start seeds indoors for fall vegetables?
Start seeds indoors in mid to late August to transplant outdoors in early September for a successful fall harvest.
What soil preparation is recommended for August planting?
Amend soil with compost to improve fertility and drainage, especially in raised beds and containers.
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