What to Plant in March
Oklahoma City, OK · Zone 7a
Last frost: Mar 28
Frost-free days: 222
Spring is building momentum. Start tomatoes and peppers indoors if you haven't already. Cool-season crops like peas, spinach, and lettuce can go outdoors once the soil is workable.
March at a Glance
Indoor
Transplant
Direct Sow
1
5
10
15
20
25
Chives
Cilantro
Lavender
Mint
Oregano
Parsley
Rosemary
Sage
Thyme
Artichoke
Beet
Broccoli
Brussels Sprouts
Cabbage
Carrot
Cauliflower
Celery
Eggplant
Garlic
Kale
Leek
Lettuce
Okra
Onion
Peas
Potato
Pumpkin
Radish
Spinach
Squash
Strawberry
Sunflower
Sweet Potato
Swiss Chard
Turnip
Zucchini
Start Indoors 28
Start these seeds indoors under grow lights or on a sunny windowsill.
Plant now
Chives
Jan 1 – May 8
9 per sq ft
60–90 days
Lavender
Jan 1 – Mar 16
1 per sq ft
90–120 days
Mint
Jan 1 – May 16
4 per sq ft
60–90 days
Parsley
Jan 1 – Apr 15
4 per sq ft
70–90 days
Rosemary
Jan 1 – Mar 23
1 per sq ft
80–120 days
Thyme
Jan 1 – Apr 23
4 per sq ft
70–90 days
Artichoke
Jan 1 – May 23
1 per sq ft
85–100 days
Broccoli
Jan 1 – Apr 15
1 per sq ft
60–100 days
Cabbage
Jan 1 – Apr 15
1 per sq ft
70–100 days
Cauliflower
Jan 1 – Apr 15
1 per sq ft
55–100 days
Celery
Jan 1 – Mar 16
4 per sq ft
80–120 days
Kale
Jan 1 – May 8
1 per sq ft
50–65 days
Leek
Jan 1 – May 16
4 per sq ft
90–150 days
Onion
Jan 1 – May 23
9 per sq ft
100–120 days
Strawberry
Jan 1 – May 31
4 per sq ft
60–90 days
Oregano
Jan 9 – May 16
1 per sq ft
60–90 days
Sage
Jan 9 – May 8
1 per sq ft
75–90 days
Lettuce
Jan 17 – Apr 23
4 per sq ft
45–60 days
Spinach
Jan 17 – Mar 31
9 per sq ft
35–50 days
Swiss Chard
Jan 17 – May 23
4 per sq ft
50–60 days
Tomato
Feb 8 – Apr 30
1 per sq ft
65–80 days
Growing guide
Eggplant
Feb 15 – Apr 8
1 per sq ft
70–90 days
Pepper
Feb 15 – Apr 15
1 per sq ft
60–100 days
Growing guide
Sunflower
Feb 15 – May 23
1 per sq ft
70–100 days
Pumpkin
Mar 9 – Apr 15
¼ per sq ft
85–120 days
Squash
Mar 9 – Jun 30
1 per sq ft
45–65 days
Zucchini
Mar 9 – Jun 30
1 per sq ft
45–60 days
Later this month
Okra
Mar 24 – May 31
1 per sq ft
50–65 days
Transplant 22
Move these seedlings from indoors to your garden beds.
Chives
Feb 15 – Jul 16
9 per sq ft
60–90 days
Mint
Feb 15 – Jul 16
4 per sq ft
60–90 days
Parsley
Feb 15 – Jun 23
4 per sq ft
70–90 days
Broccoli
Feb 15 – Jun 8
1 per sq ft
60–100 days
Brussels Sprouts
Feb 15 – Jun 8
1 per sq ft
80–110 days
Cabbage
Feb 15 – Jun 8
1 per sq ft
70–100 days
Cauliflower
Feb 15 – Jun 8
1 per sq ft
55–100 days
Kale
Feb 15 – Jun 23
1 per sq ft
50–65 days
Leek
Feb 15 – Aug 8
4 per sq ft
90–150 days
Lettuce
Feb 15 – May 23
4 per sq ft
45–60 days
Onion
Feb 15 – Aug 16
9 per sq ft
100–120 days
Spinach
Feb 15 – Apr 30
9 per sq ft
35–50 days
Strawberry
Feb 15 – Jul 16
4 per sq ft
60–90 days
Swiss Chard
Feb 15 – Jun 23
4 per sq ft
50–60 days
Lavender
Mar 1 – May 31
1 per sq ft
90–120 days
Oregano
Mar 1 – Jul 8
1 per sq ft
60–90 days
Rosemary
Mar 1 – Jun 8
1 per sq ft
80–120 days
Sage
Mar 1 – Jun 30
1 per sq ft
75–90 days
Thyme
Mar 1 – Jun 30
4 per sq ft
70–90 days
Artichoke
Mar 1 – Jul 31
1 per sq ft
85–100 days
Celery
Mar 1 – Jun 8
4 per sq ft
80–120 days
Sunflower
Mar 9 – Jun 15
1 per sq ft
70–100 days
Direct Sow 9
Plant these seeds directly into the soil outdoors.
Plant now
Garlic
Jan 1 – Sep 23
9 per sq ft
180–240 days
Cilantro
Feb 8 – May 23
9 per sq ft
30–45 days
Beet
Feb 8 – Jun 23
9 per sq ft
50–70 days
Peas
Feb 8 – Jun 8
8 per sq ft
55–70 days
Radish
Feb 8 – May 23
16 per sq ft
22–30 days
Turnip
Feb 8 – Jun 23
9 per sq ft
30–60 days
Carrot
Feb 15 – Jul 16
16 per sq ft
70–80 days
Potato
Feb 22 – Jul 16
1 per sq ft
70–150 days
Later this month
Sweet Potato
Mar 24 – May 8
1 per sq ft
90–120 days
March Gardening Tips
- Start Tomato, Pepper, Squash indoors now to give them a head start before transplanting outside.
- Lettuce, Broccoli, Cabbage can be transplanted outside this month. Harden off seedlings over 5–7 days before planting out.
- Direct sow Carrot, Peas, Potato straight into the garden — no transplanting needed.
- Add compost to beds now so nutrients are available when planting time arrives.
Nearby Cities
Ready to plan your garden?
Add these crops to your garden plan and get personalized planting reminders for Zone 7a.
Start Planning Free