Washington, D.C. Nature Guide: May 2026
Data updated: August 2026Sources & method · Corrections
May is the District's birding crescendo — Rock Creek Park fills with the peak warbler wave, the Wood Thrush sings from every ravine, and the city's gardens and meadows hit full stride as the warm season finally arrives.
Week by week in May
April 30 – May 6
- The peak warbler wave hits Rock Creek — magnolia, blackpoll, blackburnian, and dozens more pour through the ravine at dawn.
- Mountain laurel opens pink-and-white clusters on the dry upland slopes as the spring ephemerals fade under the closing canopy.
- Chesapeake-region strawberries arrive in earnest at the markets alongside peak asparagus and the first peas.
May 7–13
- The wood thrush sings its haunting flute song from the Rock Creek ravines as breeding birds settle onto territory.
- Swallowtails are common across the city, and the first great spangled fritillaries emerge in the open meadows.
- Warm-season planting is in full swing — direct-sow corn, melons, and okra as the soil warms.
May 14–20
- Indigo buntings, great crested flycatchers, and Acadian flycatchers fill the wood edges as the last migrants pass through.
- The National Arboretum's peonies and the first roses, kin of the District's American Beauty, come into bloom.
- Black locust and the creamy clusters of viburnum perfume the wood edges with late-spring white bloom.
May 21–27
- Monarchs lay eggs on the milkweed in the city's meadow plantings, beginning the first locally raised brood of the year.
- Strawberries peak alongside garlic scapes, fava beans, and a rainbow of cutting lettuces at the FreshFarm markets.
- Wood ducks lead broods through the Kenilworth lotus beds, and great blue herons tend the Anacostia rookery.
May 28 – June 3
- The first lotus and waterlily buds rise at Kenilworth Aquatic Gardens, and meadows brighten with black-eyed Susan and milkweed.
- Southern magnolias open their huge creamy, lemon-scented blossoms across the city.
- Mulch deeply and stake tomatoes early as the District's humid summer growth accelerates.
Birds This Month
May is the peak of spring migration and the District's best birding of the year. Rock Creek Park hosts a famous warbler wave — magnolia, blackpoll, Cape May, bay-breasted, blackburnian, chestnut-sided, black-throated blue and black-throated green, American redstart, and ovenbird among dozens of species pouring through the ravine. The official D.C. bird, the wood thrush, sings its flute-like song at dawn, and veeries and Swainson's thrushes pass through.
Scarlet tanagers, rose-breasted grosbeaks, Baltimore and orchard orioles, great crested flycatchers, and indigo buntings arrive to breed, and the air over the Anacostia fills with swallows and chimney swifts. Ruby-throated hummingbirds work the columbine and azaleas.
This month's tip: bird Rock Creek's Maintenance Yard and ridge trails in the first hours after dawn during the second and third weeks for the densest mixed warbler flocks of the year.
What's Blooming
May carries the District from spring ephemerals into the lush growth of early summer. The last woodland flowers — wild blue phlox, wild geranium, mayapple, Solomon's seal, false Solomon's seal, jack-in-the-pulpit, and wild columbine on the rocky Potomac bluffs — bloom in Rock Creek and at Roosevelt Island before the canopy fully shades them out. Mountain laurel opens its pink-and-white clusters on the dry upland slopes.
The U.S. National Arboretum reaches its showiest moment as the azaleas finish and the historic peonies and the first roses — kin of the District's flower, the American Beauty rose — come into bloom. Meadows and roadsides green up with fleabane, ox-eye daisy, golden ragwort, and the first blackberry and multiflora rose. In the garden, irises, peonies, and clematis hit their stride across the city's rowhouse plots.
Garden This Month
May is when the District's warm-season garden goes in. After the last frost — typically early-to-mid April in the warm core, into early May in the cooler uplands — set out tomatoes, peppers, eggplant, and basil, and direct-sow beans, squash, cucumbers, melons, corn, and okra once the soil has warmed. Keep harvesting the cool-season crops — lettuce, spinach, peas, and radishes — before the heat makes them bolt.
Mulch generously to hold moisture and suppress weeds before D.C.'s humid summer sets in, stake and cage tomatoes early, and begin a regular watering rhythm. Plant out warm-weather herbs and flowers, and set out sweet potato slips toward month's end. Pinch back basil and herbs to keep them bushy, and watch for the first squash bugs and cucumber beetles. The transition from spring to summer in the garden happens fast this month.
Zone 7a (cooler uplands and Rock Creek corridor): the frost has passed by early-to-mid May here, so set out tomatoes, peppers, eggplant, and basil once nights stay reliably warm, and direct-sow beans, squash, cucumbers, and corn.
Zone 7b (warmer downtown and riverside core): warm-season planting is in full swing — set out all tender transplants and direct-sow beans, squash, melons, and corn, and start succession sowings of warm-weather greens before the heat builds.
What's at the Farmers Market
May markets in D.C. surge with the spring harvest. Strawberries from the Chesapeake region arrive in earnest, sweet and fragrant, alongside the peak of asparagus and the first tender peas and fava beans. Spring onions, scallions, garlic scapes, radishes, baby turnips, spinach, arugula, and a rainbow of cutting lettuces fill the stalls at Eastern Market and the FreshFarm markets.
Rhubarb is at its best, and the first spring herbs — dill, cilantro, mint, and chives — appear, along with bedding plants and starts for late planting. Choose strawberries that are fully red and fragrant, since they won't ripen further, and refrigerate them dry and unwashed; pick asparagus and peas firm and bright and use them quickly while the sugars are high. The full abundance of the growing season is now underway.
The Washington, D.C. native plants guide covers what grows here
Night Sky This Month
May nights deepen the District's spring sky and bring the first hint of summer. Brilliant orange Arcturus in Boötes rides high overhead, with blue-white Spica in Virgo to its south and the small semicircle of Corona Borealis nearby. Leo sinks toward the west, while the Summer Triangle of Vega, Deneb, and Altair begins to clear the eastern horizon late in the night.
The Eta Aquariid meteor shower, debris from Halley's Comet, peaks in early May; it favors the southern hemisphere but can produce swift dawn meteors low in the southeast from the District. There's no other major shower, so May is for galaxy-hunting — the Virgo and Coma clusters and the bright globular cluster M13 in rising Hercules reward a telescope under dark skies.
City light hides the faintest detail; for the best views, drive into the rural Maryland or Virginia countryside. The printable Washington, D.C. night-sky guide gives this year's planet positions for the city.
Butterflies & Pollinators
May brings the District's butterfly diversity into full swing. The big swallowtails are now common across Rock Creek, the Arboretum, and city gardens — eastern tiger, spicebush, zebra, and black swallowtails patrol the wood edges and nectar at azalea, lilac, and dame's rocket. The iridescent red-spotted purple basks on sunlit trails, and cabbage whites, orange sulphurs, pearl crescents, silver-spotted skippers, and American and painted ladies fill the meadows and gardens. Spring azures and eastern tailed-blues work low among the clover. Monarchs are laying eggs on the milkweed in the city's meadow plantings, beginning the first locally raised brood of the year, and the first great spangled fritillaries emerge in the open fields. This is the easiest month yet to watch butterflies in the District — plant nectar-rich natives and milkweed, and let a corner of the garden grow a little wild to host the caterpillars.
What to plant for them is in the Washington, D.C. native plants guide
Trees This Month
May completes the District's canopy and turns to early-summer flowering. The big native trees finish leafing out — scarlet, white, and red oaks, tulip tree, hickories, American beech, and the Mall's arching American elms — and the tulip trees high in Rock Creek open their orange-and-green tulip-shaped flowers. The flowering dogwoods, fringe trees, and black locust perfume the wood edges with white bloom.
Late spring bloomers take over: the creamy flat clusters of blackhaw and nannyberry viburnum, the showy white panicles of catalpa, and the pink mophead of mimosa later. Mountain laurel blooms on the dry upland slopes of Rock Creek. The American beeches and sweetgums are in full fresh leaf, the riverside sycamores show their distinctive mottled bark, and the forest has closed into deep summer shade.
The Washington, D.C. native plants guide covers what grows with them
Weather & Daylight
Across Washington, D.C., a typical May day averages a high near 74°F and a low near 53°F, with about 4.0 inches of precipitation — District-wide averages from the 1991–2020 U.S. climate normals.
Warm, easy days near 74 give way to comfortably cool evenings in the low 50s, with showers arriving often.
| Average high | 74°F |
|---|---|
| Average low | 53°F |
| Precipitation | 4.0 in |
| Sunrise (mid-month) | 5:56 ET |
| Sunset (mid-month) | 20:13 ET |
Figures are District-wide 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). Temperature and precipitation use Maryland District-wide normals (the District has no separate climate series).
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One short note when Washington, D.C.'s next month turns — what's arriving, blooming, and worth a night outside.
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The complete Washington, D.C. birding, native-plant, and night-sky references — or the whole year, week by week, in one book.
Same month elsewhere: May in Florida · May in Georgia · May in Idaho