What to Plant in March: U.S. Gardening Guide

March is one of the busiest planting months for U.S. gardeners. What to plant in March depends on your USDA zone, last frost date, soil condition, and local weather.

Cold regions may still be starting seeds indoors, while warmer areas can already plant vegetables outdoors. The safest approach is to match each crop with your local frost window instead of following one national date.

Quick Answer

What to plant in March includes peas, lettuce, radishes, spinach, carrots, beets, kale, and other cool-season crops in suitable regions. Warmer areas may also begin planting tomatoes, peppers, and other warm-season vegetables after frost danger passes.

TL;DR

Plant cool-season crops when soil is workable.
Start warm-season seeds indoors in colder zones.
Check your local last frost date.
Don’t work soil when it’s saturated.
Harden off seedlings before outdoor planting.
Warm regions can plant earlier.

How March Planting Changes Across the U.S.

March is a transition month rather than a single planting window. Northern gardeners may still have frozen ground, while southern gardeners may already be growing outdoors.

For example, Utah State University recommends planting peas, lettuce, and radishes once garden soil is workable. Georgia Extension recommends cool-season vegetables in late March while warm-season crops wait for warmer soil and safer weather.

Best Vegetables to Plant in March

Peas, lettuce, radishes, spinach, carrots, and other cool-season vegetables are common March choices.

The exact planting date depends on your climate. Illinois Extension notes that frost dates, days to maturity, and crop type all affect sowing dates.

Good March options include:

Peas in cool, workable soil.
Lettuce during cool weather.
Radishes for a quick crop.
Spinach in suitable spring conditions.
Carrots where soil is workable.
Beets in regions with an early spring.
Kale for cool-season growing.
Turnips in suitable climates.

Peas Are a Great Early-Spring Choice

Peas are among the vegetables that can be planted early in spring. They prefer cool conditions and don’t need the hot weather required by tomatoes or peppers.

Utah State University recommends sowing peas once garden soil is workable. It also suggests repeat plantings every two to three weeks in suitable areas to extend the harvest.

Avoid walking or digging in wet soil. Working saturated soil can damage its structure and create compacted areas.

Leafy Greens for March Gardens

Lettuce, spinach, kale, and similar greens can fit many early-spring gardens.

These crops generally handle cooler weather better than warm-season vegetables. In colder areas, use indoor starts, cold frames, or other protection when outdoor conditions remain harsh.

Planting should still follow your local weather. A crop that works outdoors in March in Georgia may need indoor starting in Minnesota.

Radishes, Carrots, and Other Root Crops

Radishes are especially useful for gardeners wanting a quick spring crop. Carrots and beets can also be planted when the soil is suitable.

Loose, workable soil helps roots develop properly. Avoid preparing beds when the soil is wet enough to form sticky clumps.

Georgia Extension recommends additional March plantings of quick crops such as turnips, mustard, radishes, and spring onions.

When to Plant Tomatoes and Peppers

Tomatoes and peppers are warm-season crops, so March timing varies sharply by location.

In colder areas, March is often better for starting these plants indoors. Pennsylvania Extension recommends starting tomato and pepper seeds indoors during March.

In warmer regions, outdoor planting may become possible after the local frost danger has passed and soil temperatures are suitable. Don’t use a single March date for every state.

Start Warm-Season Seeds Indoors

March can be an excellent seed-starting month for summer crops. Tomatoes, peppers, eggplants, and some annual flowers can be started indoors in colder regions.

Pennsylvania Extension recommends starting tomatoes, peppers, eggplants, perennials, and annual flowers indoors during March.

Give seedlings strong light and good air circulation. Before moving them permanently outdoors, harden them off gradually.

What to Plant in March by USDA Zone

Zones 3–4

Outdoor planting remains limited in many areas. Focus on indoor seed starting and wait for workable soil before direct sowing.

Cold-tolerant crops can move outdoors later as local conditions improve.

Zones 5–6

March is often a major seed-starting month. Cool-season crops can begin outdoors when soil and weather allow.

Broccoli, cabbage, and similar crops may be started indoors before later transplanting.

Zones 7–8

March often provides more outdoor opportunities. Peas, carrots, spinach, lettuce, radishes, and other cool-season crops can fit many gardens.

Warm-season seedlings can also be started indoors for later planting.

Zones 9–11

March can be an active outdoor gardening month. Many gardeners can grow cool-season vegetables while beginning the transition toward warm-season crops.

However, local frost and heat patterns still matter more than the zone number alone.

Flowers to Plant or Start in March

March is also useful for flowers. The right choices depend on whether you are sowing outdoors, starting seeds indoors, or planting established plants.

Suitable options can include:

Sweet peas in appropriate climates.
Poppies where locally recommended.
Hardy annuals.
Summer annuals started indoors.
Perennials started from seed.
Regionally suitable native flowers.
Early-season flowers from local nurseries.
Flower seedlings ready for later transplanting.

Oregon State University recommends several early-season and beneficial-insect plants in March, including alyssum, phacelia, coriander, candytuft, sunflower, yarrow, and dill.

Trees, Shrubs, and Perennials

March can be a useful planting month for trees, shrubs, and perennials once soil conditions are suitable.

Illinois Extension recommends planting new trees and shrubs when soil is dry enough to work and planting bare-root plants before they leaf out.

Don’t dig into saturated soil. If a handful of soil stays tightly packed after squeezing, wait for better conditions.

Prepare Your Soil Before Planting

Good spring planting starts with workable soil. March is a useful time to test soil and add organic matter when needed.

Utah State University recommends soil sampling to help determine fertilizer needs. It also warns against working saturated garden soil.

Before planting:

Check soil moisture.
Remove weeds and old debris.
Add suitable organic matter.
Follow soil-test recommendations.
Avoid walking on wet beds.
Prepare rows before sowing.

Protect Young Plants From Late Frost

A warm March afternoon doesn’t mean winter is finished. Late frosts can damage tender seedlings and newly planted warm-season crops.

Keep frost protection available until your local risk has passed. Row covers, cold frames, and other suitable methods can protect appropriate crops during short cold periods.

Warm-season plants need extra caution because tomatoes and peppers are much less tolerant of freezing conditions.

Common March Planting Mistakes

Planting by calendar alone

March can be early spring in one state and late winter in another.

Working wet soil

Wet soil can become compacted and lose useful structure.

Moving seedlings outside too quickly

Seedlings started indoors need gradual exposure to outdoor conditions.

Planting warm-season crops too early

Tomatoes, peppers, and similar crops need warmer conditions than peas or lettuce.

Ignoring days to maturity

A crop still needs enough time to grow before summer heat or another seasonal change affects it.

March Garden Checklist

Use this checklist to plan your spring garden:

Check your USDA hardiness zone.
Find your local last frost date.
Test soil if needed.
Plant cool-season crops when soil is workable.
Start warm-season seeds indoors.
Harden off seedlings before transplanting.
Prepare beds without working saturated soil.
Protect young plants from late freezes.
Plan succession plantings for quick crops.
Keep track of planting dates and results.

What to Plant Now vs. Wait Until Later

If your soil is cold or your last frost is still weeks away, start with cool-season crops or indoor seedlings. Don’t rush tomatoes, peppers, cucumbers, beans, or other heat-loving crops into cold ground.

As spring advances, gradually move toward warm-season planting. Illinois Extension recommends using frost dates and days to maturity when deciding when to sow different vegetables.

FAQs

What vegetables should I plant in March?

Common choices include peas, lettuce, radishes, spinach, carrots, beets, kale, and turnips. Your local frost date and soil conditions determine the best timing.

Is March too early to plant a garden?

Not necessarily. March is an active gardening month in many regions, but colder areas may need indoor seed starting first.

Can I plant tomatoes in March?

Yes, but timing varies by climate. In colder regions, March is often better for starting tomatoes indoors. Outdoor planting should wait until local frost danger has passed.

Can I plant peppers in March?

You can start pepper seeds indoors in many colder regions. Outdoor planting generally requires warmer conditions and protection from frost.

What flowers can I plant in March?

March can be used for cool-season flowers, hardy annuals, and indoor flower starts. Local climate determines which flowers can safely go outdoors.

Should I plant seeds or transplants in March?

Use both methods. Direct sow cool-season crops when conditions allow, while starting warm-season plants indoors when your outdoor season has not arrived.

How do I know when my garden is ready?

Check that the soil is workable rather than wet and sticky. Then compare your crop’s needs with your local frost date and expected temperatures.

Conclusion

What to plant in March depends on where you garden and how quickly spring is arriving. Cool-season crops such as peas, lettuce, radishes, spinach, and kale can start early, while warm-season crops often need more time.

Check your frost date, soil condition, and crop requirements before planting. Start warm-season seeds indoors when needed, protect young plants from late freezes, and let your local climate guide the schedule.