Planting calendar
June Planting Guide for Denver, CO: Raised Beds, Containers & In-Ground
In June, Denver gardeners can focus on warm-season vegetables and herbs in raised beds, containers, and in-ground gardens. Plant heat-tolerant crops and continue succession planting to maximize your growing season. Be mindful of potential early fall frosts when planning late-season crops.
Plant now (quick list)
Tomatoes, Peppers, Squash (summer varieties), Beans (bush and pole), Cucumbers, Basil, Eggplant, Melons
Plant now
- Tomatoes
- Peppers
- Squash (summer varieties)
- Beans (bush and pole)
- Cucumbers
- Basil
- Eggplant
- Melons
- Corn
- Okra
Start indoors
- Broccoli (for fall transplant)
- Cabbage (for fall transplant)
- Cauliflower (for fall transplant)
- Kale (for fall transplant)
- Brussels sprouts (for fall transplant)
- Lettuce (heat-tolerant varieties)
- Swiss chard
- Herbs like cilantro and parsley
Avoid
- Cool-season crops like peas and radishes (may bolt quickly)
- Potatoes (harvest time, not planting)
- Leafy greens prone to bolting in heat
- Late-season root crops (too late for good yield)
- Planting frost-sensitive crops without protection
Next 2 weeks
- Mulch to conserve moisture and regulate soil temperature
- Monitor for pests like aphids and squash bugs
- Water deeply early in the day to reduce evaporation
- Pinch back herbs to encourage bushier growth
- Thin seedlings in raised beds and containers
- Fertilize tomatoes and peppers with balanced nutrients
- Stake or cage tall plants like tomatoes and beans
- Harvest early crops regularly to encourage production
FAQs
Can I plant tomatoes directly in the ground in June in Denver?
Yes, June is a good time to transplant tomato seedlings into the ground after the last frost risk has passed.
How often should I water container plants in June?
Containers typically need daily watering in June due to heat and faster drying; check soil moisture regularly.
Is it too late to start cool-season crops in June?
Generally yes, but you can start some cool-season crops indoors now for transplanting in late summer for a fall harvest.
What pests should I watch for in June in Denver gardens?
Common pests include aphids, squash bugs, and flea beetles; inspect plants regularly and manage promptly.
Should I fertilize my raised bed vegetables in June?
Yes, applying balanced fertilizer mid-season supports ongoing growth and fruit production.
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