Michigan gardeners should wait for soil to thaw before planting frost-resistant vegetables in March. Knowing the Best Vegetables To Plant In March In Michigan can turn a slow start into a productive season. This guide covers cold-hardy crops that thrive in Michigan’s unpredictable early spring weather.
March in Michigan is tricky. One day it’s sunny and 50°F, the next you get a snow squall. But don’t let that stop you. With the right choices, you can get a head start on your garden while others are still waiting.
Below, you’ll find a complete breakdown of what to plant, when to plant it, and how to protect your seedlings from late frosts. Let’s dig in.
Best Vegetables To Plant In March In Michigan
These vegetables are the champions of cold soil. They germinate in temperatures as low as 35°F and can handle light frosts without damage. Here are your top picks.
Peas
Peas are the classic March crop in Michigan. They love cool weather and stop producing once summer heat arrives.
- Plant sugar snap, snow, or shelling peas as soon as soil can be worked
- Soak seeds overnight to speed germination
- Space seeds 2 inches apart in rows 18 inches apart
- Provide a trellis or netting for climbing varieties
Spinach
Spinach is incredibly frost-tolerant. It can survive temperatures down to 20°F once established.
- Sow seeds 1/2 inch deep, 2 inches apart
- Thin seedlings to 4 inches apart when they have two true leaves
- Harvest outer leaves first to extend the season
- Plant a new batch every two weeks for continuous harvest
Lettuce
Loose-leaf and romaine types do best in March. Head lettuce may bolt if temperatures swing too much.
- Scatter seeds on the soil surface and cover lightly with soil
- Keep soil moist but not waterlogged
- Use row covers if a hard freeze is forecast
- Harvest when leaves are 4-6 inches tall
Kale
Kale gets sweeter after a frost. It’s one of the hardiest greens you can plant.
- Plant seeds 1/4 inch deep, 12 inches apart
- Thin to 18 inches apart for full-sized plants
- Mulch around plants to keep soil cool
- Harvest from the bottom up for continuous growth
Carrots
Carrots need loose, stone-free soil to grow straight. March planting gives them time to develop before summer heat.
- Sow seeds 1/4 inch deep, 2 inches apart
- Keep soil consistently moist until germination (10-14 days)
- Thin seedlings to 3 inches apart
- Choose short varieties like ‘Nantes’ or ‘Danvers’ for heavy clay soil
Radishes
Radishes are the fastest crop you can plant in March. Some varieties are ready in 22 days.
- Plant seeds 1/2 inch deep, 1 inch apart
- Sow a new row every week for continuous harvest
- Harvest when roots are 1 inch in diameter
- Use ‘Cherry Belle’ or ‘French Breakfast’ for best results
Beets
Beets are dual-purpose: you eat the root and the greens. They tolerate light frost well.
- Soak seeds overnight to improve germination
- Plant 1 inch deep, 2 inches apart
- Thin to 4 inches apart when seedlings are 2 inches tall
- Harvest greens when 4 inches tall, roots when 2 inches across
Onions
Onion sets (small bulbs) are easier than seeds for March planting. They handle cold soil without issue.
- Plant sets 1 inch deep, 4 inches apart
- Choose short-day varieties for Michigan’s latitude
- Water deeply once a week
- Harvest when tops fall over and turn brown
Turnips
Turnips grow fast and store well. Both roots and greens are edible.
- Sow seeds 1/2 inch deep, 2 inches apart
- Thin to 6 inches apart for large roots
- Harvest greens when 4 inches tall
- Pull roots when 2-3 inches in diameter
Swiss Chard
Swiss chard is a colorful, heat-tolerant green that starts well in March. It produces all season.
- Plant seeds 1 inch deep, 4 inches apart
- Thin to 8 inches apart for full plants
- Harvest outer leaves when 6 inches tall
- Mulch to keep soil cool and moist
Soil Preparation Tips For March Planting
Your soil is the foundation of a successful garden. March soil in Michigan is often cold and wet. Here’s how to get it ready.
Test Soil Temperature
Don’t guess. Use a soil thermometer to check at 4 inches deep.
- Peas and spinach germinate at 40°F
- Carrots and beets need at least 45°F
- Wait until soil reaches 50°F for onions and kale
Improve Drainage
Wet soil in March can rot seeds. Raised beds are ideal for early planting.
- Add compost to improve soil structure
- Create raised rows 6-8 inches high
- Avoid walking on wet soil to prevent compaction
Add Organic Matter
Compost provides nutrients and helps soil warm faster.
- Mix 2-3 inches of compost into the top 6 inches of soil
- Use aged manure if available
- Apply a balanced organic fertilizer at planting time
Protecting Plants From Late Frosts
Michigan can get frost well into April. Be prepared to protect your March plantings.
Use Row Covers
Floating row covers are lightweight fabric that traps heat and blocks frost.
- Drape covers directly over plants
- Secure edges with soil or rocks
- Remove covers during warm days to prevent overheating
Try Cold Frames
A cold frame is a simple box with a glass or plastic top. It creates a mini-greenhouse.
- Place cold frames in a sunny spot
- Open the lid on warm days to vent heat
- Close at night to trap warmth
Water Before Frost
Wet soil holds more heat than dry soil. Water plants thoroughly before a frost night.
- Water in the afternoon so it soaks in before dark
- Moist soil releases heat slowly through the night
- Combine with row covers for extra protection
Planting Schedule For March In Michigan
Michigan is a large state with different climate zones. Use this schedule based on your region.
Southern Michigan (Zone 6A-6b)
These areas near Detroit and Ann Arbor warm up first.
- Early March: Plant peas, spinach, lettuce, radishes
- Mid-March: Plant carrots, beets, kale, Swiss chard
- Late March: Plant onion sets, turnips
Central Michigan (Zone 5B-6a)
Areas like Lansing and Grand Rapids have moderate springs.
- Mid-March: Plant peas, spinach, radishes
- Late March: Plant lettuce, kale, carrots, beets
- Early April: Plant onion sets, turnips, Swiss chard
Northern Michigan (Zone 4B-5a)
Upper Peninsula and northern Lower Peninsula have colder, longer winters.
- Late March: Plant peas, spinach (with row covers)
- Early April: Plant radishes, lettuce, kale
- Mid-April: Plant carrots, beets, onion sets
Common Mistakes To Avoid In March
Even experienced gardeners make errors in early spring. Here are pitfalls to skip.
Planting Too Early
Warm-season crops like tomatoes, peppers, and beans will die in March soil.
- Wait until soil is at least 60°F for warm-season crops
- Start seeds indoors for transplanting in May
- Don’t be tempted by a warm spell in March
Overwatering
Cold soil holds moisture longer. Overwatering leads to root rot and fungal diseases.
- Water only when the top inch of soil is dry
- Use a moisture meter if unsure
- Water in the morning so leaves dry by night
Ignoring Hardening Off
If you start seeds indoors, they need to adjust to outdoor conditions gradually.
- Place seedlings outside for 1 hour on day one
- Increase by 1 hour each day for a week
- Protect from wind and direct sun initially
- Plant after 7-10 days of hardening off
Succession Planting For Continuous Harvest
Don’t plant everything at once. Stagger your plantings for a steady supply.
Weekly Sowings
Plant a small amount of the same crop every week.
- Radishes: Sow a 2-foot row every 7 days
- Lettuce: Plant 4-6 seeds every 10 days
- Spinach: Sow a 3-foot row every 14 days
Replace Spent Crops
When radishes or lettuce are done, replant the space with something else.
- After radishes: Plant bush beans or summer squash
- After lettuce: Plant cucumbers or peppers (from transplants)
- After peas: Plant tomatoes or broccoli
Tools And Supplies For March Gardening
Having the right gear makes March planting easier and more successful.
Essential Tools
- Soil thermometer: Know when the ground is ready
- Garden trowel: For small planting holes
- Row covers: Protect from frost and pests
- Garden hose with spray nozzle: Gentle watering
- Compost: Improve soil fertility
Optional But Helpful
- Cold frame: Extend your season by weeks
- Seed starting trays: For indoor starts
- Garden journal: Track planting dates and results
- Mulch: Straw or shredded leaves to insulate soil
Frequently Asked Questions
Here are answers to common questions about planting in March in Michigan.
Can I Plant Tomatoes In March In Michigan?
No. Tomatoes are warm-season plants and need soil temperatures above 60°F. Start seeds indoors in March for transplanting in May.
What is the best vegetable to plant in March in Michigan for beginners?
Radishes are the easiest. They germinate in 4-7 days and are ready to harvest in 3-4 weeks. They tolerate cold soil and light frost.
Should I use fertilizer when planting in March?
Yes, but use a balanced organic fertilizer. Mix it into the soil at planting time. Avoid high-nitrogen fertilizers that promote leafy growth at the expense of roots.
How do I know if the soil is ready for planting?
Take a handful of soil and squeeze it. If it crumbles easily, it’s ready. If it forms a muddy ball, wait a few days. Also check soil temperature with a thermometer.
Can I plant broccoli in March in Michigan?
Broccoli prefers cool weather but needs soil temperatures above 50°F. Start seeds indoors in March and transplant in April. Direct seeding in March is risky in most of Michigan.
Final Tips For March Gardening Success
March gardening in Michigan requires patience and preparation. Here’s a quick recap of what matters most.
- Focus on frost-resistant vegetables like peas, spinach, and kale
- Prepare soil with compost and check temperature before planting
- Use row covers or cold frames to protect from late frosts
- Plant in succession for continuous harvests
- Start warm-season crops indoors for May transplanting
With these strategies, you’ll have fresh greens and root vegetables weeks before your neighbors. The key is to start small, protect your plants, and enjoy the process. Michigan’s short growing season rewards those who begin early.
Remember that every year is different. Some Marches are mild, others are brutal. Stay flexible and watch the weather forecast. A little planning now means a bountiful harvest later.
Get your seeds ready, check your soil, and start planting. Your March garden will thank you.