What to Plant in March — Zone 4
Cold winters with a moderate growing season. Many popular vegetables thrive with proper timing.
Quick Answer
In zone 4 during March, early spring — soil preparation begins, cool-season crops go outside, and indoor seedlings need attention. Your key tasks this month: start tomatoes, broccoli, cauliflower, and cabbage indoors, sow lettuce and swiss chard seeds indoors, and test soil and amend beds with compost.
March Gardening Tasks for Zone 4
March is early spring — soil preparation begins, cool-season crops go outside, and indoor seedlings need attention. Zone 4 has a frost-free window from May 20 – Sept 15, which shapes what you can plant and when. Here is your complete task list:
Plant Guides for This Month
These plants are mentioned in your March tasks. Read their full growing guides for detailed planting instructions:
Tomato
America's most popular garden vegetable, tomatoes come in thousands of varieties…
Lettuce
Lettuce is the perfect beginner crop—fast-growing, forgiving, and endlessly vers…
Broccoli
Homegrown broccoli has a depth of flavor that supermarket heads simply can't mat…
Cauliflower
Cauliflower is the diva of the brassica family—demanding consistent moisture, co…
Cabbage
Cabbage is a cool-weather workhorse that stores for months and serves as the bas…
Swiss Chard
Swiss chard is the showstopper of the greens world, with stems in electric red, …
Helpful Guides for March
These gardening guides are especially useful this time of year:
- Seed Starting Indoors — essential if you're starting transplants this month
- Companion Planting Guide — plan your layout for maximum yield
- Organic Pest Control — prepare defenses as the season progresses
- Building Better Soil — start any month to improve next season's harvests
- Pest & Disease Library — identify and solve common garden problems organically
- Browse All Plant Guides — detailed growing instructions for every crop
Frequently Asked Questions
What should I plant in March in zone 4?
In zone 4 during March, focus on: Start tomatoes, broccoli, cauliflower, and cabbage indoors. Sow lettuce and Swiss chard seeds indoors. Test soil and amend beds with compost. The frost-free period for zone 4 is May 20 – Sept 15.
Is it too late to plant in March in zone 4?
March is a productive month in zone 4. Cold winters with a moderate growing season. Many popular vegetables thrive with proper timing. Check each crop's days to maturity against your remaining frost-free window (May 20 – Sept 15).
What is USDA zone 4?
USDA Zone 4 has a frost-free growing season from approximately May 20 – Sept 15. Cold winters with a moderate growing season. Many popular vegetables thrive with proper timing.