What to Plant in June

Denver, CO · Zone 5b

Last frost: May 5 Frost-free days: 154

The growing season is in full swing. Transplant any remaining warm-season crops and direct sow fast-growing varieties. Succession-plant beans and greens every two weeks.

June at a Glance

Indoor Transplant Direct Sow
1 5 10 15 20 25
Today
Chives
Cilantro
Dill
Mint
Oregano
Parsley
Thyme
Artichoke
Beans (Bush)
Beet
Broccoli
Brussels Sprouts
Cabbage
Carrot
Cauliflower
Celery
Kale
Leek
Lettuce
Onion
Peas
Potato
Radish
Spinach
Squash
Strawberry
Swiss Chard
Turnip
Zucchini

Start Indoors 4

Start these seeds indoors under grow lights or on a sunny windowsill.

Kale
Kale
Mar 9 – Jun 23
1 per sq ft 50–65 days
Swiss Chard
Swiss Chard
Mar 24 – Jul 16
4 per sq ft 50–60 days
Squash
Squash
May 9 – Jun 8
1 per sq ft 45–65 days
Zucchini
Zucchini
May 9 – Jun 8
1 per sq ft 45–60 days

Transplant 20

Move these seedlings from indoors to your garden beds.

Chives
Chives
Apr 24 – Jun 23
9 per sq ft 60–90 days
Mint
Mint
Apr 24 – Jun 23
4 per sq ft 60–90 days
Parsley
Parsley
Apr 24 – Jul 16
4 per sq ft 70–90 days
Broccoli
Broccoli
Apr 24 – Jul 16
1 per sq ft 60–100 days
Brussels Sprouts
Brussels Sprouts
Apr 24 – Jul 16
1 per sq ft 80–110 days
Cabbage
Cabbage
Apr 24 – Jul 16
1 per sq ft 70–100 days
Cauliflower
Cauliflower
Apr 24 – Jul 16
1 per sq ft 55–100 days
Kale
Kale
Apr 24 – Aug 8
1 per sq ft 50–65 days
Leek
Leek
Apr 24 – Jun 8
4 per sq ft 90–150 days
Lettuce
Lettuce
Apr 24 – Jun 15
4 per sq ft 45–60 days
Onion
Onion
Apr 24 – Jun 8
9 per sq ft 100–120 days
Spinach
Spinach
Apr 24 – Jun 8
9 per sq ft 35–50 days
Strawberry
Strawberry
Apr 24 – Jun 23
4 per sq ft 60–90 days
Swiss Chard
Swiss Chard
Apr 24 – Aug 16
4 per sq ft 50–60 days
Oregano
Oregano
May 1 – Jun 15
1 per sq ft 60–90 days
Thyme
Thyme
May 1 – Jun 8
4 per sq ft 70–90 days
Artichoke
Artichoke
May 1 – Jun 15
1 per sq ft 85–100 days
Celery
Celery
May 1 – Jul 16
4 per sq ft 80–120 days
Squash
Squash
Jun 1–30
1 per sq ft 45–65 days
Zucchini
Zucchini
Jun 1–30
1 per sq ft 45–60 days

Direct Sow 9

Plant these seeds directly into the soil outdoors.

Cilantro
Cilantro
Mar 17 – Jun 15
9 per sq ft 30–45 days
Turnip
Turnip
Mar 17 – Sep 23
9 per sq ft 30–60 days
Beet
Beet
Mar 24 – Sep 8
9 per sq ft 50–70 days
Carrot
Carrot
Mar 24 – Jul 31
16 per sq ft 70–80 days
Peas
Peas
Mar 24 – Jun 30
8 per sq ft 55–70 days
Radish
Radish
Mar 24 – Jun 15
16 per sq ft 22–30 days
Potato
Potato
Apr 24 – Jul 8
1 per sq ft 70–150 days
Dill
Dill
May 17 – Jul 31
4 per sq ft 40–60 days
Beans (Bush)
Beans (Bush)
May 17 – Jun 30
9 per sq ft 50–60 days

June Gardening Tips

  • Start Squash, Zucchini, Kale indoors now to give them a head start before transplanting outside.
  • Squash, Zucchini, Lettuce can be transplanted outside this month. Harden off seedlings over 5–7 days before planting out.
  • Direct sow Beans (Bush), Carrot, Peas straight into the garden — no transplanting needed.
  • Water deeply but less often to encourage deep root growth. Morning watering reduces disease risk.

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