Best Vegetables To Plant In March In Oregon

Oregon’s rainy March conditions make it ideal for moisture-loving vegetables that germinate well in cool, damp soil. If you are looking for the best vegetables to plant in march in oregon, you have come to the right place. March is a tricky month here—sometimes it snows, sometimes it rains sideways, and sometimes you get a sunny 60-degree day that tricks you into thinking spring has arrived. But for the most part, the soil is cold and wet, which actually works in your favor for certain crops.

You don’t need a greenhouse or fancy equipment to get started. Many vegetables thrive when planted directly into the ground or into raised beds in March. The key is choosing the right varieties that can handle cool temperatures and even a little frost. Below, I’ll walk you through the best options, how to plant them, and what to avoid.

Let’s get right to it. These are the vegetables that perform consistently well when planted in March across most of Oregon, from the Willamette Valley to the coast and even into higher elevations with some protection.

Leafy Greens For Early Harvests

Leafy greens are your best friend in March. They love cool weather and will give you fresh salads before most other things are even sprouting.

Spinach – Plant seeds directly in the ground. It germinates in soil as cold as 35°F. Harvest baby leaves in about 30 days.
Lettuce – Choose loose-leaf varieties like Black Seeded Simpson or Red Sails. They handle rain better than head lettuces.
Arugula – Spicy and fast. You can start picking leaves in three weeks. It bolts quickly in heat, so March planting is perfect.
Kale – Siberian or Winterbor varieties are extra cold-hardy. Plant now for harvests through late spring.
Swiss chard – Bright lights variety adds color to the garden. It tolerates wet soil better than most greens.

For best results, sow seeds about 1/4 inch deep and keep the soil moist. Oregon rain usually handles this for you, but if we get a dry spell, water gently. Thin seedlings to about 6 inches apart once they have two true leaves.

Root Vegetables That Love Cool Soil

Root crops are another excellent choice for March. They develop slowly in cool conditions, which actually makes them sweeter and more tender.

Carrots – Short varieties like Nantes or Chantenay work best in Oregon clay soil. Long carrots struggle in heavy ground. Sow seeds shallowly and keep them damp until they sprout, which can take up to three weeks.
Radishes – The fastest crop you can grow. Cherry Belle or French Breakfast varieties are ready in 25 days. Plant a row every two weeks for continuous harvests.
Beets – Detroit Dark Red is a reliable choice. Soak seeds overnight before planting to speed up germination. Both the roots and greens are edible.
Turnips – Purple Top White Globe is classic. They grow well in cool, damp soil and store nicely in the ground for weeks.
Parsnips – Slow but worth it. They need 120 days to mature, but frost improves their flavor. Plant now for fall harvests.

Root vegetables need loose soil free of rocks and clumps. If your soil is heavy clay, consider building raised beds or amending with compost. Carrots especially will fork and twist in hard ground.

Peas And Beans For Early Trellises

Peas are a March classic in Oregon. They actually prefer cool weather and will stop producing once summer heat arrives.

Snow peas – Oregon Sugar Pod II is a local favorite. You eat the whole pod, and they are ready in about 60 days.
Shelling peas – Lincoln or Green Arrow varieties produce well in our climate. They need a trellis or netting to climb.
Snap peas – Sugar Ann is a compact variety that doesn’t need much support. Sweet and crunchy.

Plant pea seeds about 1 inch deep and 2 inches apart. They germinate best when soil temperatures are between 40°F and 70°F. In March, that’s usually the case in western Oregon. If you are east of the Cascades, wait until late March or early April.

Fava beans are another option for March. They are more cold-tolerant than regular beans and fix nitrogen in the soil. Plant them 2 inches deep and 6 inches apart. They take longer to mature than peas but are worth it for the unique flavor.

Brassicas For Late Spring Harvests

Broccoli, cauliflower, and cabbage are best started indoors in late February or early March, then transplanted out in mid to late March. But you can also direct seed some varieties if you are patient.

Broccoli – Start seeds indoors 6 weeks before your last frost date. For most of Oregon, that means starting in February and transplanting in March. Waltham 29 is a good choice for our climate.
Cauliflower – More finicky than broccoli. It needs consistent moisture and cool temperatures. Snow Crown is reliable for beginners.
Cabbage – Early varieties like Golden Acre can be direct seeded in March. They handle light frosts well.
Brussels sprouts – These take a long time (90-120 days) but are perfect for Oregon’s cool summers. Start indoors and transplant in April.

When transplanting brassicas, harden them off for a week by setting them outside during the day and bringing them in at night. Space plants 18-24 inches apart. Use row covers if a hard freeze is forecast.

Onions And Alliums For Long Seasons

March is the ideal time to plant onions in Oregon. You have three options: seeds, sets (small bulbs), or transplants.

Onion sets – The easiest method. Plant them 1 inch deep and 4 inches apart. Yellow or white varieties work well. Red onions are slightly less reliable but still worth trying.
Onion seeds – Cheaper but slower. Start indoors in January or February, then transplant in March. Walla Walla sweets are a local legend.
Leeks – Start seeds indoors or buy transplants. They need a long, cool growing season. Plant them in trenches and hill them up as they grow for extra white stem.
Garlic – If you forgot to plant garlic last fall, you can still plant it in March. The bulbs will be smaller, but you’ll get green garlic and small cloves by summer.

Onions are heavy feeders. Mix compost into the soil before planting. Keep them well-watered but not waterlogged. Oregon rain usually provides enough moisture, but if we get a dry spell, give them an inch of water per week.

Herbs That Survive March Weather

Herbs are not technically vegetables, but they belong in every March garden. They attract pollinators, repel pests, and add flavor to your harvests.

Cilantro – Direct seed in March. It bolts quickly in heat, so early planting is key. Harvest leaves regularly to delay flowering.
Parsley – Soak seeds overnight before planting. Italian flat-leaf parsley is more flavorful than curly. It takes 3-4 weeks to germinate, so be patient.
Chives – Plant divisions or seeds. They are perennial and will come back year after year. Garlic chives are a nice alternative.
Dill – Direct seed in March. It self-sows readily, so plant it once and enjoy it for years. Use the leaves fresh or let the seeds mature for pickling.

Herbs generally need less fertilizer than vegetables. Plant them in well-draining soil and give them full sun if possible. In March, that can be tricky, but they will tolerate some shade.

How To Prepare Your Oregon Garden For March Planting

Before you start throwing seeds in the ground, take a few steps to set yourself up for success. Oregon soil in March is often cold, wet, and compacted. A little preparation goes a long way.

Test Your Soil Temperature

Seeds won’t germinate if the soil is too cold. Use a soil thermometer to check. For most cool-season crops, you want at least 40°F at a depth of 2 inches. If the soil is colder, wait a week or use row covers to warm it up.

Improve Drainage

Oregon clay soil holds water like a sponge. If your garden stays soggy, build raised beds or add organic matter like compost or aged bark. Good drainage prevents root rot and helps seeds germinate faster.

Use Season Extenders

Floating row covers, cold frames, or cloches can protect your seedlings from late frosts and heavy rain. They also warm the soil by a few degrees, which speeds up germination. You don’t need anything fancy—even an old plastic jug with the bottom cut off works as a cloche.

Plan Your Garden Layout

Think about what you will plant later in spring. March crops like peas and spinach will be done by June, leaving space for tomatoes, peppers, or squash. Plant your March vegetables in blocks or rows that are easy to remove later. This is called succession planting, and it maximizes your harvest.

What Not To Plant In March In Oregon

It is just as important to know what to avoid. March is too early for warm-season crops. They will rot in cold soil or get killed by a late frost.

Tomatoes – Wait until May. Even if you start them indoors, do not transplant until night temperatures stay above 50°F.
Peppers – Same as tomatoes. They need warmth and will sulk in cool soil.
Eggplant – Too cold. Start indoors in April for June transplanting.
Corn – Soil needs to be at least 60°F. That rarely happens in Oregon before May.
Beans – Regular beans (not fava) rot in cold, wet soil. Wait until late April or May.
Cucumbers – They need warmth and consistent temperatures above 50°F.
Squash – Summer and winter squash are warm-season crops. Plant them in late May or early June.

If you are tempted to plant these early, you will likely be disappointed. Stick with the cool-season crops listed above, and you will have a productive garden by late spring.

Regional Tips For Oregon Gardeners

Oregon is a big state with different climates. What works in Portland might not work in Bend or Medford. Here are some region-specific tips.

Willamette Valley

This is the heart of Oregon gardening. March is wet and cool, with average temperatures between 40°F and 55°F. Your soil is usually workable by mid-March. Focus on leafy greens, peas, and root vegetables. Raised beds are highly recommended because the valley has heavy clay soil.

Coastal Areas

The coast is even wetter and cooler. March temperatures hover around 45°F to 50°F. Your growing season is long but cool. Kale, chard, and brassicas do exceptionally well here. Use raised beds or mounds to improve drainage. Row covers are helpful for keeping heavy rain off young seedlings.

Eastern Oregon

East of the Cascades, March is colder and drier. You might still have snow on the ground. Wait until late March or early April to plant. When you do, choose cold-hardy varieties like Siberian kale or Purple Top turnips. Soil warms up faster in this region once the snow melts, so you can plant quickly.

Southern Oregon

The Rogue Valley is warmer than the rest of the state. March temperatures can reach 60°F on sunny days. You can plant a wider range of crops, including early beans and even some tomato transplants if you protect them from frost. But be cautious—late frosts happen here too.

Common Mistakes To Avoid When Planting In March

Even experienced gardeners make errors in March. Here are the most common ones and how to avoid them.

Planting too deep – Small seeds like lettuce and carrots need to be barely covered. Planting them too deep prevents germination.
Overwatering – Oregon rain provides plenty of moisture. Only water if the soil is dry an inch below the surface. Overwatering leads to damping off and root rot.
Ignoring frost dates – Know your average last frost date. For most of Oregon, it is between April 15 and May 15. Have row covers ready for unexpected frosts.
Not thinning seedlings – Crowded plants compete for nutrients and water. Thin them to the recommended spacing once they have two sets of leaves.
Forgetting to harden off transplants – If you started seeds indoors, they need a week to adjust to outdoor conditions. Skip this step, and they will likely die.

Frequently Asked Questions About March Planting In Oregon

Can I plant tomatoes in March in Oregon?

No, it is too cold. Tomatoes need soil temperatures above 60°F and night temperatures above 50°F. Start them indoors in March for transplanting in May.

What is the easiest vegetable to grow in March in Oregon?

Radishes are the easiest. They germinate in cool soil, grow quickly, and are ready to harvest in under a month. You can also try arugula or leaf lettuce.

Should I use fertilizer when planting in March?

It depends on your soil. If you added compost in the fall, you probably don’t need fertilizer. If your soil is poor, use a balanced organic fertilizer at half strength. Too much nitrogen encourages leafy growth at the expense of roots.

How do I protect my March garden from frost?

Use row covers, cloches, or old blankets. Water the soil before a frost—wet soil holds heat better than dry soil. Avoid using plastic directly on plants, as it can trap moisture and cause rot.

Can I plant potatoes in March in Oregon?

Yes, you can plant seed potatoes in March once the soil is workable. They tolerate cool soil and light frosts. Choose early varieties like Yukon Gold or Red Norland for best results.

Final Thoughts On March Planting In Oregon

March is a month of patience and preparation. The best vegetables to plant in march in oregon are those that thrive in cool, damp conditions. Stick with leafy greens, root vegetables, peas, and brassicas, and you will have a productive garden long before summer arrives. Remember to prepare your soil, protect your plants from frost, and be realistic about what can grow. Oregon’s climate is unique, but it rewards gardeners who work with it rather than against it. Get your seeds in the ground now, and you will be enjoying fresh salads, roasted roots, and snap peas by late spring.