March is the hinge of the Delaware year — winter loosens its grip, the wintering waterfowl thin out as spring migrants arrive, and the first wildflowers and tree blossoms break the dormancy. The marshes shift from a winter to a migratory rhythm, and the woods begin to green.
Week by week in March
February 26 – March 4
- American woodcock begin their twilight sky-dance over old fields and damp clearings at dusk, a classic early-spring Delaware spectacle.
- Red maples color the wet woods and roadsides red with their tiny flowers, the earliest tree bloom of the year.
- On a mild day when the soil is workable, direct-sow the hardiest crops — peas, spinach, and radishes tolerate the late-winter cold.
March 5–11
- Snow geese and tundra swans begin streaming north out of Bombay Hook and Prime Hook as the great winter gathering breaks up.
- Spring beauty and bloodroot open on the floodplain woods along the Brandywine and White Clay Creek, the first spring ephemerals.
- On the first warm afternoons, overwintered mourning cloaks patrol the wooded edges and stream corridors — the first butterflies of the year.
March 12–18
- Ospreys return to the Delaware Bay nest platforms around mid-month, a signal moment of the Delaware spring.
- Forsythia, crocus, and daffodils blaze yellow, and spicebush hazes the moist woods with tiny flowers before leaf-out.
- Plant peas, spinach, lettuce, onion sets, and seed potatoes as the coastal-plain soil dries and warms.
March 19–25
- Tree swallows, eastern phoebes, and pine warblers reclaim the marshes and woodland edges as spring migration builds.
- Eastern redbud swells its buds toward bloom and the first flowering dogwood bracts show in sheltered spots.
- The spring equinox arrives; Leo the Lion rides high in the south as the winter constellations sink earlier in the west.
March 26 – April 1
- Trout lily and Dutchman's breeches join the spring-ephemeral carpet on the rich Brandywine and White Clay Creek floodplains.
- The tiny powder-blue spring azure appears around flowering shrubs, one of Delaware's earliest fresh-brood butterflies.
- Willows along the Christina and bay-shore ditches flush yellow-green, among the first trees to leaf.
Birds This Month
March is a month of changeover in Delaware. The wintering snow geese and tundra swans begin streaming north out of Bombay Hook and Prime Hook, while the first spring migrants push in: ospreys return to the bay-shore nest platforms around mid-month, a signal moment of Delaware spring, and tree swallows, eastern phoebes, pine warblers, and red-winged blackbirds reclaim the marshes and woodland edges. Waterfowl numbers shift toward late-staying ducks, green-winged teal, and the first returning shorebirds probing the mudflats.
In the woods, resident songbirds are in full song — Carolina wrens, cardinals, titmice, and Carolina chickadees — and American woodcock perform their twilight sky-dance over old fields and damp clearings at dusk, a classic early-spring Delaware spectacle. Bald eagles are on eggs, and the first great blue herons stand in their rookeries.
This month's tip: at dusk on a calm March evening, stand at the edge of a brushy old field or the Prime Hook trails and listen for the nasal peent and twittering display flight of the American woodcock — one of the most charming sounds of the Delaware spring.
What's Blooming
March brings the first real flowers to Delaware. In the rich floodplain woods along the Brandywine and White Clay Creek, the spring ephemerals begin: spring beauty carpets the ground with pink-striped white flowers, bloodroot opens its single white bloom around a clasping leaf, and the mottled leaves of trout lily push up before their nodding yellow flowers. Skunk cabbage is well up in the swampy seeps, and the buds of Virginia bluebells begin to swell in the moist bottomlands.
In gardens and naturalized edges, crocus, daffodils, snowdrops, and the first forsythia blaze yellow, and the native spicebush hazes the understory of the moist woods with tiny yellow flowers before the leaves emerge. The first red maple flowers tint the wet woods red. It is the opening of the wildflower season, accelerating fast as the days lengthen and the coastal-plain soil warms.
Garden This Month
March is when the Delaware garden truly wakes. As the soil dries and warms, direct-sow the cool-season crops the state's long spring favors: peas, spinach, lettuce, arugula, radishes, carrots, beets, and Swiss chard all go in now, along with onion sets, leek transplants, and seed potatoes. Indoors under lights, keep tomatoes, peppers, and eggplant growing for setting out after the frost date, and start brassicas like broccoli and cabbage for transplanting in a few weeks.
This is the last clean window to finish dormant pruning of apples, peaches, and grapes before the buds break, and a good time to plant bare-root trees, fruit canes, asparagus crowns, and rhubarb while they are still dormant. Top-dress beds with compost, cut down any remaining ornamental grasses and perennial stalks before new growth tangles them, and divide overgrown perennials as they begin to push. Watch the forecast — Delaware can still throw a hard frost — and keep row cover handy to protect tender seedlings on cold nights. The momentum of the season is unmistakable now.
Zone 7a (northern New Castle County): wait for the soil to dry before working it, then direct-sow the hardy crops — peas, spinach, lettuce, radishes, and onion sets — and start warm-season transplants like tomatoes and peppers indoors under lights now.
Zone 7b (Kent, Sussex, and the coast): the milder lower counties are a couple of weeks ahead — plant peas, spinach, kale, carrots, beets, and potatoes, and set out onion and leek transplants, watching for late frosts that can still bite the coastal plain into April.
What's at the Farmers Market
March markets in Delaware bridge winter and spring. The storage crops persist — sweet potatoes, white potatoes, onions, garlic, carrots, beets, and cabbage — and the last of the winter squash and storage apples are eating down. But the first truly fresh items of the year begin to appear: hoop-house spinach, lettuce, arugula, and salad mix are at their tender best, and the earliest forced rhubarb and cut daffodils brighten the stands.
Vegetable and herb starts begin showing up for gardeners stocking the spring beds, alongside the steady local honey, eggs, and jarred preserves. Choose hoop-house greens with crisp, unwilted leaves and use them quickly, and pick roots that are firm and heavy. Some markets offer cool-stored overwintered leeks and parsnips, sweetened by their long stay in the cold ground — choose firm, sound specimens. The market is reawakening, the first fresh green a welcome change after the long storage-crop season.
Night Sky This Month
March brings the spring equinox and the changeover of the night sky. The brilliant winter constellations — Orion, Taurus, and the Winter Hexagon — still command the early-evening sky in the west but sink earlier each night, while the spring stars climb in the east. Leo the Lion, marked by the backward-question-mark Sickle and the bright star Regulus, rides high, and the handle of the Big Dipper swings up to arc toward orange Arcturus rising in the northeast.
There is no major meteor shower in March, so this is a fine month for galaxy-hunting once the Moon is out of the way: the realm of galaxies in Leo and Virgo climbs into view for a telescope under a dark sky. With the equinox, day and night reach near balance, and the cold-weather clarity still gives sharp views before spring's haze sets in. Seek the darkest skies at Cape Henlopen and along the lower Sussex coast.
Exact planet positions vary year to year — the printable Delaware night-sky guide lists the current planet and Moon details for your part of the state.
Butterflies & Pollinators
March marks the true start of the Delaware butterfly year. On the first warm, sunny afternoons, the overwintering adults emerge from dormancy: mourning cloaks patrol the wooded edges and stream corridors of White Clay Creek and the Brandywine, and eastern commas and question marks appear at sap flows and along sunlit trails. The first cabbage whites flutter over gardens and field edges, and toward the end of the month the tiny powder-blue spring azure, one of Delaware's earliest fresh-brood butterflies, appears around flowering shrubs and woodland edges.
The monarchs are still far to the south, only beginning the multi-generation relay that will bring their descendants back to Delaware in May. This is the month to finish planting the butterfly garden and to leave last year's leaf litter undisturbed a little longer, since overwintering chrysalides and sheltering adults are still tucked within it. Even a single warm March day can put the first butterflies of the year on the wing in the First State.
What to plant for them is in the Delaware native plants guide
Trees This Month
March is when Delaware's trees break dormancy. The red maples color the wet woods and roadsides red with their tiny flowers, the earliest tree bloom of the year, and the silver maples and American elms along the rivers flower close behind. Eastern redbud swells its buds toward the rosy bloom to come, and the native spicebush hazes the moist understory with pale yellow. Toward month's end the first flowering dogwood bracts begin to show in sheltered spots.
The willows along the Christina and the bay-shore ditches flush yellow-green, and the weeping willows are among the first to leaf. The evergreens hold steady — the American holly of the coastal plain, the loblolly pines of Sussex shedding the last winter needles, and the eastern red cedars dusting pollen in the old fields. The sugar maples and oaks of the Piedmont are still bare but stirring, their buds swelling visibly on warm days. The bare-woods season is ending, and within weeks the canopy will begin to close.
The Delaware native plants guide covers what grows with them
Weather & Daylight
Across Delaware, a typical March day averages a high near 54°F and a low near 34°F, with about 4.1 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Mud season arrives as afternoons warm into the mid-50s but mornings near freezing, with the heaviest rains of the season soaking the ground.
| Average high | 54°F |
|---|---|
| Average low | 34°F |
| Precipitation | 4.1 in |
| Sunrise (mid-month) | 7:15 ET |
| Sunset (mid-month) | 19:09 ET |
Figures are statewide averages over the 1991–2020 U.S. climate normals; local conditions vary with elevation and distance from the coast. Sunrise and sunset are computed for a midstate point on the 15th (ET).
Next month's version of this page, by email
One short note when Delaware's next month turns — what's arriving, blooming, and worth a night outside.
Go deeper with the Delaware guides
The complete Delaware birding, native-plant, and night-sky references — or the whole year, week by week, in one book.
Same month elsewhere: March in Washington, D.C. · March in Florida · March in Georgia