New York Nature Guide: September 2026
Data updated: August 2026Sources & method · Corrections
September is the turn to autumn across New York — the great hawk and songbird migrations stream south, the monarchs funnel down the coast, the apple and grape harvests peak, and the first true fall color creeps down from the Adirondacks. It is one of the two best birding months and one of the most beautiful of the year.
Week by week in September
September 3–9
- The hawk migration builds, with sharp-shinned hawks, kestrels, and ospreys streaming along the Shawangunk and Helderberg ridges.
- New England aster blazes royal purple in the meadows as the asters and late goldenrods reach their grand finale.
- The monarch migration funnels down the coast — Fire Island, Montauk, and Jones Beach see gathering, roosting monarchs.
September 10–16
- Broad-winged hawks stream south in swirling 'kettles' of thousands — the marquee mid-September flight from the ridgetop watch sites.
- The apple harvest hits full stride with dozens of varieties, and the Concord grapes ripen in the Finger Lakes and Lake Erie belt.
- The sugar maples of the Adirondacks and Catskills begin to light up as cold mountain nights trigger the color change.
September 17–23
- The autumn equinox near September 22 evens day and night, and the Great Square of Pegasus and the Andromeda Galaxy climb high in the east.
- The songbird migration runs in full — Central Park fills with birders again as warblers, thrushes, and the first sparrow waves move through.
- Plant garlic and spring-flowering bulbs late in the month, and watch the forecast as the first frost nears upstate.
September 24–30
- Fall foliage peaks in the Adirondacks as the color front begins its sweep down toward the Catskills and Hudson Valley.
- Bottle and fringed gentians bloom deep blue in the damp meadows — among the last and loveliest natives of the year.
- Waterfowl return in force — scaup, ring-necked ducks, and the dabblers build at Montezuma and the Finger Lakes.
Birds This Month
September is one of the two peak birding months in New York, dominated by spectacular migration. The hawk flight takes center stage: from ridgetop and lakeshore watch sites — the Helderberg and Shawangunk ridges, the Hudson Valley overlooks, and the Lake Ontario shore — thousands of broad-winged hawks stream south in swirling "kettles" in mid-September, joined by sharp-shinned and Cooper's hawks, American kestrels, ospreys, bald eagles, harriers, and peregrine falcons.
The songbird migration runs in full: warblers in subtle fall plumage move through the woods and Central Park again fills with birders, alongside southbound thrushes, vireos, flycatchers, tanagers, grosbeaks, and a building wave of sparrows. The coast still hosts shorebirds at Jamaica Bay, and nighthawks and swallows stream over the valleys. Nocturnal migration peaks on clear nights with north winds — a morning after such a night can flood a woodlot with migrants. Keep feeders full and water available for the travelers passing through.
What's Blooming
September is the grand finale of New York's wildflower year, when the asters and late goldenrods blanket every meadow, roadside, and old field in waves of purple, blue, white, and gold. The New England aster blazes royal purple, joined by New York, heath, calico, smooth, and panicled asters, while the goldenrods peak — the last great nectar source before frost, alive with bees and the migrating monarchs.
The fields still hold late black-eyed Susan, ironweed, joe-pye weed, boneset, sneezeweed, and the climbing seed-plumes of virgin's bower, and in damp meadows the deep-blue closed bottle gentian and fringed gentian bloom — among the last and loveliest natives of the year. Wetlands show cardinal flower, great blue lobelia, turtlehead, and nodding bur-marigold. In gardens, the sedum, dahlias, asters, mums, anemones, and sunflowers carry the season. The first frost in the Adirondacks will end the show there while downstate it lingers on.
Garden This Month
September is the great autumn-transition month in the New York garden — still harvesting heavily while the first frost approaches, earliest in the Adirondacks and latest downstate. The warm-season crops finish strong: tomatoes, peppers, eggplant, beans, sweet corn, winter squash, pumpkins, melons, and the main-crop potatoes are gathered and cured. Watch the forecast closely, and when the first frost threatens, harvest the tender crops or cover them with row cover to buy more ripening time.
The fall harvest comes into its own — kale, chard, spinach, lettuce, broccoli, cabbage, carrots, beets, and leeks all sweeten in the cooling weather. Late in the month, plant garlic for next summer and set out spring-flowering bulbs — daffodils, tulips, crocus. As beds empty, pull spent plants, sow a cover crop to protect the soil, and begin the autumn cleanup, but leave seed heads and standing stems for the birds and overwintering insects. Divide and plant perennials, and water new plantings well before the ground freezes.
Zone 4a (Adirondacks & coldest valleys): the first frost typically arrives this month, often early. Harvest tender crops before the first cold nights, cover what you can to extend the season, and begin putting the garden to bed as growth shuts down.
Zone 5b (much of upstate & the Catskills): the first frost usually comes late this month or in October. Harvest steadily, plant garlic and spring bulbs late in the month, sow a cover crop in cleared beds, and be ready to cover tender crops on the first frost night.
Zone 6b (lower Hudson Valley, NYC & western lakeshore): the season runs well into October here. Keep harvesting, sow fast fall greens and spinach, plant garlic late in the month, and enjoy a long, productive autumn before the first frost.
What's at the Farmers Market
September is one of the richest months at New York markets, bridging the summer harvest and the autumn crops. The orchard takes over: the apple harvest hits full stride, with dozens of varieties from Hudson Valley and western New York orchards, alongside fresh cider, the first pears, and the last peaches and plums. The Concord and other grapes ripen in the Finger Lakes and Lake Erie belt, perfuming the markets.
The vegetable tables still hold summer's tomatoes, peppers, eggplant, sweet corn, beans, and melons, now joined by autumn's winter squash, pumpkins, potatoes, onions, leeks, cabbage, broccoli, kale, and Brussels sprouts. Choose apples that feel heavy and firm and store them cold; pick deep-colored, fragrant, frosted grape clusters and refrigerate them, as they bruise easily; select winter squash with hard, dull rinds and dry stems and cure them in a warm, dry spot; and choose pumpkins with intact stems and no soft spots. The fall farm-stand season — with its mums, gourds, and cornstalks — is in full swing.
Night Sky This Month
September brings the comfortable nights and earlier darkness that make it a favorite stargazing month in New York, and the autumn equinox near September 22 evens day and night before the long nights take over. The Summer Triangle still rides high overhead in the early evening, with the Milky Way arching through it, while the autumn constellations climb the east: the Great Square of Pegasus, the chained figure of Andromeda, and within it the Andromeda Galaxy — the most distant object visible to the naked eye, best from dark skies.
There is no major meteor shower this month, but the long, increasingly dark nights and the rising autumn sky make for fine deep-sky observing of Andromeda, the Double Cluster in Perseus, and the last of the summer Milky Way. The harvest moon, the full moon nearest the equinox, rises near sunset on several successive evenings. On geomagnetically active nights the aurora returns to the northern horizon upstate. The printable New York night-sky guide gives this year's planet positions and the darkest viewing sites for your region.
Butterflies & Pollinators
September is the month of the monarch migration in New York — the natural spectacle of the autumn. The southbound migrating generation streams down the state, and the Long Island and New York City coastline becomes a funnel: at Fire Island, Montauk, Robert Moses, and Jones Beach, monarchs gather by the hundreds, roosting in trees overnight and nectaring on seaside goldenrod by day before crossing the harbor toward Cape May and on to the Mexican overwintering forests. Peak passage usually falls in the first three weeks of the month.
Other butterflies are still flying in the warm early-autumn sun. Common buckeyes peak now and can be numerous, migrant cloudless sulphurs and painted ladies move through, and sulphurs, cabbage whites, pearl crescents, eastern tailed-blues, fritillaries, and late skippers work the asters and goldenrod. The mourning cloaks and commas of the new generation appear, feeding to prepare for hibernation. Watch any stand of goldenrod or aster on a sunny day — and watch the coast for the monarchs, the unforgettable sight of September.
What to plant for them is in the New York native plants guide
Trees This Month
September is when New York's legendary fall color begins, descending from the cold high country into the lowlands. The sugar maples of the Adirondacks and Catskills light up first — brilliant orange, red, and yellow — as cold mountain nights trigger the change, and the color spreads steadily downhill and southward through the month. The early turners lead everywhere: red maple, black gum, sassafras, sumac, and Virginia creeper flame red, while ash, birch, aspen, and hickory turn gold.
This is the great mast month: the oaks drop acorns, the hickories shed nuts, the black walnuts and butternuts fall, and the beechnuts ripen, feeding the deer, turkeys, squirrels, and bears fattening for winter. The shagbark hickories and witch hazel — the latter blooming yellow even as it fruits — add to the show. The conifers stand dark green against the brightening hardwoods. Foliage peaks in the Adirondacks late this month, with the color front sweeping down toward the Hudson Valley and Long Island in October.
The New York native plants guide covers what grows with them
Weather & Daylight
Across New York, a typical September day averages a high near 71°F and a low near 50°F, with about 4.0 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Summer eases into fall, with pleasant 71-degree days and cool 50-degree nights and rain that lingers into evening.
| Average high | 71°F |
|---|---|
| Average low | 50°F |
| Precipitation | 4.0 in |
| Sunrise (mid-month) | 6:40 ET |
| Sunset (mid-month) | 19:12 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 New York's next month turns — what's arriving, blooming, and worth a night outside.
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The complete New York birding, native-plant, and night-sky references — or the whole year, week by week, in one book.
Same month elsewhere: September in North Carolina · September in North Dakota · September in Ohio