New Jersey Nature Guide: May 2026
May is the climax of the New Jersey nature year — peak songbird migration, the globally significant gathering of Red Knots and horseshoe crabs on Delaware Bay, and woods alive with warblers and wildflowers. For birders and naturalists, no month rivals it.
What to look for this week
- Feeders are at their winter peak — chickadees, titmice, nuthatches, and cardinals work the seed, with dark-eyed juncos foraging beneath as the year's hardiest residents settle in.
- The Quadrantid meteor shower peaks in a short, sharp burst around January 3; watch the northeast after midnight from a dark Pine Barrens or shore site.
- A planning week at the kitchen table — order seeds, sketch next year's beds, and leave any snow banked over perennials as insulation against the cold.
Birds This Month
May is the peak of bird migration in New Jersey and one of the great birding months in North America. The woods fill with warblers — black-throated blue, magnolia, Blackburnian, chestnut-sided, American redstart, and dozens more — moving through in waves, alongside scarlet tanagers, rose-breasted grosbeaks, Baltimore orioles, indigo buntings, and a parade of flycatchers, vireos, and thrushes. Spots like the Cape May woods, Garret Mountain, and Sandy Hook can be electric on a good morning.
The signature May event is on Delaware Bay: as horseshoe crabs swarm ashore to spawn around the new and full moons, hundreds of thousands of shorebirds — most famously the red knot, but also ruddy turnstones, sanderlings, semipalmated sandpipers, and dunlin — gather to gorge on the eggs, refueling for the flight to the Arctic. It is a globally significant spectacle, concentrated in mid-to-late May.
This month's tip: bird the bayshore at Reeds Beach or Fortescue on a rising tide around the mid-May full moon to witness the red knot and horseshoe-crab spectacle from the designated viewing areas.
What's Blooming
May is peak wildflower season in New Jersey, the woods and meadows at their richest. The later spring-ephemeral and woodland flowers bloom in profusion: wild geranium, Solomon's seal, false Solomon's seal, mayapple, jack-in-the-pulpit, wild columbine on rocky ledges, foamflower, and the lingering violets. The native pink azalea pinxter flower and mountain laurel, the latter spectacular in the Pine Barrens and Highlands, begin their bloom.
The Pine Barrens are at a peak of their own: swamp pink finishes in the bogs, wild lupine blues the sandy openings, sand myrtle and turkey beard bloom on the plains, and the first pitcher plants and bog orchids stir in the savannas. Meadows brighten with wild strawberry, golden ragwort, and the first fleabane, and along the coast the beach plum covers the dunes in white blossom.
Garden This Month
May is when the New Jersey garden goes full warm-season. Once the local frost date passes — early-to-mid May in the south, later in the Highlands — set out tomatoes, peppers, eggplant, and basil, and direct-sow the heat-lovers: beans, squash, cucumbers, melons, and sweet corn. Keep succession-sowing lettuce, beans, and corn every couple of weeks for a continuous harvest, and plant out summer annual flowers and dahlia tubers.
Watch for late cold snaps and have row cover ready, especially inland; a single late frost can undo the whole tender garden. Mulch beds to hold moisture and suppress the weeds now germinating fast, and stake or cage tomatoes at planting before they sprawl. Pinch and feed annuals, deadhead spring bulbs but leave their foliage to ripen, and stay ahead of the first flush of aphids and slugs. It's the most rewarding planting month of the year.
Zone 6a (northwestern Highlands): the last frost typically passes by mid-to-late May here — wait for it before setting out tomatoes, peppers, and basil. Keep row cover handy for cold nights and finish hardening off transplants before they go in.
Zone 7a (central & southern New Jersey): after the early-May frost date, plant it all — tomatoes, peppers, eggplant, squash, cucumbers, and beans go in now, and the first sweet corn and successive lettuce can be sown.
Zone 7b (southern shore & Cape May): the frost-free season is open — set out warm-season crops early in the month and succession-sow beans, corn, and cucumbers, watching for the cool, damp nights the shore can still bring.
What's at the Farmers Market
May reopens the Garden State's outdoor season at New Jersey's great markets — the year-round Trenton Farmers Market in Lawrence Township, one of the oldest in the state; the bustling Saturday Collingswood Farmers Market in Camden County; the West Windsor Community Farmers Market; and the Montclair and Summit markets up north — just as the spring harvest pours in. New Jersey asparagus is at its peak, sweet and abundant from the sandy fields of Gloucester and Salem counties, and local strawberries ripen by mid-to-late month — fragrant June-bearing varieties like 'Earliglow' and 'Jersey' from the u-pick fields of Burlington and Hunterdon counties, fully sweet at picking. Rhubarb, spinach, 'Hakurei' salad turnips, radishes, scallions, spring onions, the first shelling peas, and tender arugula and lettuces fill the stands.
Vegetable starts of 'Rutgers' and 'Ramapo' tomatoes, peppers, and herbs crowd the grower tables as Jersey gardeners stock up, alongside local honey, pastured eggs, and the first cut peonies. Choose asparagus with tight, compact tips and strawberries that are fully red and fragrant, since neither sweetens after picking — use the berries within a day or two, kept dry and refrigerated unwashed. Choose greens with crisp leaves and peas with plump, bright pods. The markets are at their freshest spring abundance, and the long Jersey produce season is truly underway.
Night Sky This Month
Mild May nights make this prime stargazing season in the country's most densely populated state, and the trick in New Jersey is finding the dark gaps. The best public option is the United Astronomy Clubs of New Jersey observatory at Jenny Jump State Forest in Warren County, which runs free Saturday-night star parties from spring through fall on a high, dark ridge in the Skylands. For the darkest northern horizons, head to High Point State Park, the state's highest ground at over 1,800 feet, while the truly black skies of South Jersey lie deep in the Pine Barrens — Wharton State Forest around Batsto and Atsion, and Brendan T. Byrne State Forest, where the absence of towns leaves the southern sky genuinely dark. At New Jersey's mid-latitude of roughly 39 to 41° N the spring sky rides high and well-placed for the whole evening.
The constellation roll-call is the familiar spring lineup: trace the Big Dipper's handle to orange Arcturus in Boötes and on to blue-white Spica in Virgo, while the keystone of Hercules climbs the east with the globular cluster M13 and Vega rises to lead the Summer Triangle. The Eta Aquariid meteor shower, debris from Halley's Comet, peaks in early May; it favors southern latitudes but can still throw swift meteors low in the southeast before dawn. Overhead lie the springtime galaxies of Virgo and Coma Berenices.
Shortening nights mean less dark time, so start late and check the UACNJ schedule before driving out. Exact planet positions vary year to year — the printable New Jersey night-sky guide carries this year's details for your region.
Butterflies & Pollinators
May fills New Jersey with butterflies. The big swallowtails are now on the wing in numbers — eastern tiger swallowtail, spicebush swallowtail, and black swallowtail, with the zebra swallowtail an uncommon southern stray where its scarce pawpaw host lingers along the Delaware River — nectaring at lilac, dame's rocket, and wild geranium. Spring azures, pearl crescents, American ladies, red admirals, and silver-spotted skippers brighten gardens and meadows, and the Pine Barrens host their specialty elfins and hairstreaks. Monarchs returning from the south are laying eggs on milkweed across the state, and the first home-grown caterpillars appear. The native common violet, New Jersey's state flower, is the host for the coming generation of great spangled fritillaries. Now is the time to set out nectar plants and protect milkweed, and to watch host plants for the eggs and tiny caterpillars of the season's first broods.
Trees This Month
By May the New Jersey forest is in full leaf, the canopy closed and deep green. The late-blooming trees flower now: tulip tree opens its big orange-and-green tulip-shaped blossoms high in the canopy, black locust drapes the roadsides in fragrant white chains, and black cherry and American holly bloom. The shrub layer is spectacular — mountain laurel bursts into pink-and-white bloom across the Highlands and Pine Barrens, a signature May sight, alongside highbush blueberry and native azaleas.
In the Pine Barrens, the pitch pines shed clouds of yellow pollen and push new candles of growth, and shortleaf pine and Atlantic white cedar join the surge. The oaks — red, white, black, scarlet, and pin — have fully leafed and hang their catkins, dusting cars and ponds with pollen. The transformation from the bare gray woods of winter to the lush, shaded green of early summer is complete.
Go deeper with the New Jersey guides
The complete New Jersey birding, native-plant, wildflower, and night-sky guides — or the whole year in one bundle.
Same month elsewhere: May in New Mexico · May in New York · May in North Carolina