60 wildflowers were recorded blooming in Vermont in September in our iNaturalist sample; 15 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in September

New England aster

Flat-Top White Aster

Common Jewelweed

White Turtlehead
Bluestem Goldenrod

Swamp Aster

Whorled Wood Aster

Common Blue Wood Aster

White Snakeroot

Silverrod

Broad-Leaved Goldenrod

Red Clover
All wildflowers blooming in Vermont in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | New England aster | Symphyotrichum novae-angliae | Sunflowers, Daisies, Asters, and Allies | 435 | Sep (peak) |
| 2 | Flat-Top White Aster | Doellingeria umbellata | Sunflowers, Daisies, Asters, and Allies | 371 | Aug (past peak) |
| 3 | Common Jewelweed | Impatiens capensis | balsam family | 331 | Aug (past peak) |
| 4 | White Turtlehead | Chelone glabra | Plantain Family | 247 | Aug (past peak) |
| 5 | Bluestem Goldenrod | Solidago caesia | Sunflowers, Daisies, Asters, and Allies | 244 | Sep (peak) |
| 6 | Swamp Aster | Symphyotrichum puniceum | Sunflowers, Daisies, Asters, and Allies | 241 | Sep (peak) |
| 7 | Whorled Wood Aster | Oclemena acuminata | Sunflowers, Daisies, Asters, and Allies | 197 | Aug (past peak) |
| 8 | Common Blue Wood Aster | Symphyotrichum cordifolium | Sunflowers, Daisies, Asters, and Allies | 194 | Sep (peak) |
| 9 | White Snakeroot | Ageratina altissima | Sunflowers, Daisies, Asters, and Allies | 176 | Sep (peak) |
| 10 | Silverrod | Solidago bicolor | Sunflowers, Daisies, Asters, and Allies | 175 | Sep (peak) |
| 11 | Broad-Leaved Goldenrod | Solidago flexicaulis | Sunflowers, Daisies, Asters, and Allies | 169 | Sep (peak) |
| 12 | Red Clover | Trifolium pratense | Legumes | 143 | Jun (past peak) |
| 13 | Common Boneset | Eupatorium perfoliatum | Sunflowers, Daisies, Asters, and Allies | 140 | Aug (past peak) |
| 14 | Calico Aster | Symphyotrichum lateriflorum | Sunflowers, Daisies, Asters, and Allies | 136 | Sep (peak) |
| 15 | Nodding Beggarticks | Bidens cernua | Sunflowers, Daisies, Asters, and Allies | 127 | Sep (peak) |
| 16 | Purple Loosestrife | Lythrum salicaria | lythrum family | 124 | Aug (past peak) |
| 17 | Japanese knotweed | Reynoutria japonica | knotweed family | 124 | Sep (peak) |
| 18 | Pale Jewelweed | Impatiens pallida | balsam family | 122 | Aug (past peak) |
| 19 | Common Wrinkle-Leaved Goldenrod | Solidago rugosa | Sunflowers, Daisies, Asters, and Allies | 114 | Sep (peak) |
| 20 | Chicory | Cichorium intybus | Sunflowers, Daisies, Asters, and Allies | 104 | Jul (past peak) |
| 21 | White Wood Aster | Eurybia divaricata | Sunflowers, Daisies, Asters, and Allies | 102 | Sep (peak) |
| 22 | Wild Carrot | Daucus carota | carrot family | 97 | Jul (past peak) |
| 23 | Pearly Everlasting | Anaphalis margaritacea | Sunflowers, Daisies, Asters, and Allies | 96 | Aug (past peak) |
| 24 | Flat-Topped Goldenrod | Euthamia graminifolia | Sunflowers, Daisies, Asters, and Allies | 78 | Aug (past peak) |
| 25 | spotted Joe-Pye weed | Eutrochium maculatum | Sunflowers, Daisies, Asters, and Allies | 73 | Aug (past peak) |
| 26 | black-eyed Susan | Rudbeckia hirta | Sunflowers, Daisies, Asters, and Allies | 72 | Jul (past peak) |
| 27 | Common Selfheal | Prunella vulgaris | Mint Family | 70 | Jul (past peak) |
| 28 | Herb Robert | Geranium robertianum | Geranium family | 63 | Jun (past peak) |
| 29 | White Meadowsweet | Spiraea alba | rose family | 61 | Jul (past peak) |
| 30 | Common Soapwort | Saponaria officinalis | pink family | 60 | Jul (past peak) |
| 31 | Orange Hawkweed | Pilosella aurantiaca | Sunflowers, Daisies, Asters, and Allies | 60 | Jun (past peak) |
| 32 | Common Toadflax | Linaria vulgaris | Plantain Family | 58 | Aug (past peak) |
| 33 | Arrow-Leaved Tearthumb | Persicaria sagittata | knotweed family | 58 | Sep (peak) |
| 34 | American burnweed | Erechtites hieraciifolius | Sunflowers, Daisies, Asters, and Allies | 46 | Sep (peak) |
| 35 | Purple-Flowered Raspberry | Rubus odoratus | rose family | 44 | Jul (past peak) |
| 36 | American Witch-Hazel | Hamamelis virginiana | witch-hazel family | 42 | Oct (rising) |
| 37 | White Clover | Trifolium repens | Legumes | 39 | Jun (past peak) |
| 38 | fen grass of Parnassus | Parnassia glauca | staff-vine family | 36 | Aug (past peak) |
| 39 | Bladder Campion | Silene vulgaris | pink family | 35 | Jun (past peak) |
| 40 | Indian tobacco | Lobelia inflata | bellflower family | 34 | Aug (past peak) |
| 41 | Bird's-Foot Trefoil | Lotus corniculatus | Legumes | 33 | Jun (past peak) |
| 42 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 33 | Jul (past peak) |
| 43 | Spotted Knapweed | Centaurea stoebe | Sunflowers, Daisies, Asters, and Allies | 33 | Jul (past peak) |
| 44 | Hedge Bindweed | Calystegia sepium | bindweed family | 32 | Jul (past peak) |
| 45 | Large-Leaved Aster | Eurybia macrophylla | Sunflowers, Daisies, Asters, and Allies | 31 | Aug (past peak) |
| 46 | Cardinal Flower | Lobelia cardinalis | bellflower family | 28 | Aug (past peak) |
| 47 | Blue Vervain | Verbena hastata | Verbena Family | 28 | Jul (past peak) |
| 48 | Great Blue Lobelia | Lobelia siphilitica | bellflower family | 28 | Sep (peak) |
| 49 | Purple Crownvetch | Securigera varia | Legumes | 28 | Jul (past peak) |
| 50 | Common Tansy | Tanacetum vulgare | Sunflowers, Daisies, Asters, and Allies | 27 | Aug (past peak) |