What to Plant in March
USDA Zone 3a
Last frost: May 15 – Jun 1
Frost-free days: 90–120
Spring is still weeks away outdoors, but indoor seed starting is in full swing. Start tomatoes, peppers, and herbs under lights. Prepare beds for cool-season crops that go out next month.
March at a Glance
Indoor
Transplant
Direct Sow
1
5
10
15
20
25
Snapdragons
Parsley
Chives
Thyme
Oregano
Sage
Rosemary
Tomatoes
Peppers
Eggplant
Broccoli
Cauliflower
Cabbage
Brussels Sprouts
Onions (seed)
Celery
Start Indoors 16
Start these seeds indoors under grow lights or on a sunny windowsill.
Onions (seed)
Feb 15 – Mar 1
9 per sq ft
100–120 days
Celery
Feb 15 – Mar 1
4 per sq ft
80–120 days
Rosemary
Mar 1–8
1 per sq ft
80–120 days
Peppers
Mar 1–15
1 per sq ft
60–100 days
Eggplant
Mar 1–15
1 per sq ft
70–90 days
Snapdragons
Mar 15–22
Parsley
Mar 15 – Apr 1
4 per sq ft
70–90 days
Chives
Mar 15–22
9 per sq ft
60–90 days
Thyme
Mar 15–22
4 per sq ft
70–90 days
Oregano
Mar 15–22
1 per sq ft
60–90 days
Sage
Mar 15–22
1 per sq ft
75–90 days
Tomatoes
Mar 15 – Apr 1
1 per sq ft
65–80 days
Broccoli
Mar 15 – Apr 1
1 per sq ft
60–100 days
Cauliflower
Mar 15 – Apr 1
1 per sq ft
55–100 days
Cabbage
Mar 15 – Apr 1
1 per sq ft
70–100 days
Brussels Sprouts
Mar 15 – Apr 1
1 per sq ft
80–110 days
March Gardening Tips
- Start Broccoli, Cabbage, Eggplant indoors now to give them a head start before transplanting outside.
- Add compost to beds now so nutrients are available when planting time arrives.
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