Missouri Nature Guide: August 2026
August is late summer in Missouri — hot and humid, with the prairies turning toward their autumn palette of goldenrod and blazing star, the gardens at peak abundance, and the first stirrings of fall bird migration. The Perseid meteors and the high summer Milky Way crown the warm nights.
What to look for this week
- Bald eagles gather below the Mississippi River dams at Clarksville and the Old Chain of Rocks, fishing the open water as northern lakes freeze.
- Order seeds early before popular tomato and pepper varieties sell out, and prune dormant fruit trees on mild days.
- The Quadrantid meteor shower peaks around January 3 in a short, sharp burst; look toward the northeast after midnight from a dark Ozark sky.
- The bare bottomland sycamores glow with their white, peeling upper bark against the gray winter woods.
Birds This Month
August quietly begins Missouri's fall migration, even in the heat of late summer. The most obvious movement is the shorebirds, which pass south in growing numbers through mudflats and drawn-down wetlands — lesser and greater yellowlegs, pectoral, least, and semipalmated sandpipers, and the long-billed dowitchers probe the shallows at places like Eagle Bluffs, Squaw Creek/Loess Bluffs pools, and B.K. Leach.
The songbirds begin to slip south as well, mostly at night and quietly. Orchard orioles leave early, and the first southbound warblers trickle through the treetops, harder to identify now in their duller fall plumage. Ruby-throated hummingbirds reach their peak abundance as the year's young join the adults — feeders and stands of trumpet creeper, cardinal flower, and jewelweed are mobbed, and the birds are fattening hard for their long flight to Mexico.
Common nighthawks begin their conspicuous evening migration late in the month, streaming south in loose, bounding flocks at dusk — one of the surest signs that summer is ending. The chimney swifts gather into larger pre-migration flocks, swirling into chimneys at dusk, and the purple martins stage in big numbers before departing.
This month's tip: keep your hummingbird feeders full and clean through August and well into fall — the birds need the fuel, and leaving feeders up does not delay their migration. Watch the evening sky late in the month for the nighthawk flights streaming south.
What's Blooming
August turns Missouri's prairies and roadsides toward their late-summer gold and purple. The blazing star (gayfeather) sends up its tall purple spikes across the tallgrass prairies, and the first goldenrods and sunflowers begin the great yellow wave that defines the late season — sawtooth sunflower, ashy sunflower, and the towering compass plant and cup plant stand above the grasses.
The moist swales and stream edges fill with the tall purples of ironweed and the dusty-rose Joe-Pye weed, while great blue lobelia, brilliant red cardinal flower, and jewelweed bloom in the wet woods and along the Ozark streams. Wild bergamot, mountain mint, and rattlesnake master continue, and partridge pea brightens the roadsides yellow. The first asters open at the very end of the month, hinting at fall.
Where to see it: the western prairies — Prairie State Park and Taberville — are spectacular now with blazing star and the first goldenrods, alive with monarchs and other butterflies. Walk an Ozark streamside for the red cardinal flower and the wet-ground bloom, and watch the roadsides everywhere flush gold. Go in the cooler morning for the freshest flowers and busiest pollinators.
Garden This Month
August is the great pivot in the Missouri garden, when the fall season is planted right alongside the summer harvest peak. The summer crops are still pouring in — tomatoes, peppers, okra, beans, melons, and squash all need daily picking — but the most important forward-looking work is starting the fall garden. Set out transplants of broccoli, cabbage, kale, and collards, and direct-sow the cool-season crops that will mature in the milder autumn: turnips, beets, carrots, radishes, spinach, lettuce, and a final fast crop of bush beans.
The challenge is establishing tender fall seedlings in the lingering summer heat — sow a little deeper, keep the soil consistently moist, and shade the new seedlings if needed until they take hold. Meanwhile, pull and compost the spent, disease-prone summer plants like finished cucumbers and squash vines to reduce pest pressure. Keep watering deeply, and stay on top of the late-summer flush of Japanese beetles, squash bugs, and tomato blights that build through Missouri's humid August.
Zone 5b (northern Missouri): the fall garden goes in now. Transplant fall broccoli, cabbage, and kale, and direct-sow turnips, beets, carrots, spinach, and lettuce for a fall harvest, plus a fast crop of bush beans early in the month. Keep harvesting the summer crops and watering through any late-summer dry spells.
Zone 6a (central Missouri): a major fall-planting month. Set out fall brassica transplants, direct-sow root crops and greens for autumn and winter harvest, and plant a final round of bush beans. Keep up with the heavy summer harvest, water consistently, and clear out spent, disease-prone plants like finished cucumbers and squash.
Zone 6b (southern Ozarks and St. Louis area): plant the fall garden through August — brassica transplants, greens, carrots, beets, and turnips. The longer warm season here means you can still get a fall planting of bush beans and even a quick squash. Provide shade for tender new seedlings against the late-summer heat, and water well.
What's at the Farmers Market
August is peak abundance at Missouri markets, the fullest tables of the year. Vine-ripe tomatoes, golden sweet corn, fragrant peaches, and sweet melons — watermelon and cantaloupe — are all at their absolute best. The vegetable selection is enormous: peppers, eggplant, okra, summer squash, cucumbers, green beans, new potatoes, onions, and bunches of fresh herbs.
This is also grape country's moment in the Hermann and Augusta wine country along the river bluffs, where the table and wine grapes ripen, and the first apples and pears appear at the orchards late in the month. Look for late blackberries, the first fall raspberries, and an abundance of cut flowers and sunflowers.
For selection and storage: choose corn with plump kernels and moist silk and keep it cold in the husk; pick fragrant peaches that yield slightly and ripen them on the counter before refrigerating. Store tomatoes at room temperature, never cold, and keep melons whole at room temperature until cut, then refrigerate. Choose firm, glossy peppers and eggplant and use them within a few days. Refrigerate berries dry and unwashed, and enjoy the peak-season produce promptly while it is at its best.
Night Sky This Month
August is the premier stargazing month of the Missouri summer, crowned by the Perseid meteor shower, which peaks around August 12. The Perseids are the year's most popular shower — reliable, rich, and warm to watch — and from a dark Missouri sky they can produce dozens of bright, fast meteors an hour, many leaving glowing trails. They radiate from the constellation Perseus in the northeast, and as with all showers they are best after midnight from a dark, moonless site.
Beyond the meteors, the summer Milky Way is at its evening best, arching overhead from the Summer Triangle high in the east down through Cygnus and Aquila to the glowing star clouds of Sagittarius and Scorpius in the south. This brightest stretch of the galaxy, toward the galactic center, is loaded with star clusters and nebulae — the Lagoon, the Trifid, the Wild Duck Cluster — all rewarding in binoculars from dark skies.
The dark Ozark skies of Mark Twain National Forest are ideal for the Perseids and the Milky Way, far from the city glow. Bring insect protection and a reclining chair, and let your eyes adapt for at least twenty minutes. Because the exact Perseid peak and the planet positions shift each year, check the printable Missouri night-sky guide for this year's best viewing nights and planet visibility from your latitude.
Butterflies & Pollinators
August is a peak butterfly month in Missouri, with the late-summer generation at full strength on the goldenrod and blazing star. The monarchs are building toward their famous fall migration — the last summer generation gives rise to the long-lived migratory generation that will fly all the way to Mexico, and you will see more monarchs nectaring on milkweed, blazing star, and ironweed as the month goes on.
The prairies and gardens are alive with fritillaries and skippers — the great spangled and variegated fritillaries, dozens of small grass skippers, silver-spotted skippers, and the bold common buckeye with its eyespots. The swallowtails continue, and the late broods of painted and American ladies, red admirals, question marks, and sulphurs are widespread. Watch the prairies for the late-season regal fritillary in the best tallgrass remnants.
To support them now: August's blooming blazing star, ironweed, Joe-Pye weed, and the first goldenrods and asters are critical fuel for the migrating monarchs and the whole late-summer butterfly community. Leaving these native flowers standing — and resisting the urge to mow prairie and roadside patches — provides the nectar that powers the great southbound flight beginning next month.
Trees This Month
August keeps the Missouri forest in deep, mature summer green, though the first subtle hints of the turning season appear. The earliest trees to show fall color — the black gum (tupelo) and sumacs at the woodland edges — begin flaring red in the second half of the month, and the heat- and drought-stressed trees may drop a few early leaves. The flowering is over, and the trees' energy is entirely in ripening their fruit.
The nut and fruit crop is maturing toward fall. The pawpaws ripen in the bottomland shade, softening from green toward their custard-soft late-summer maturity, the black walnuts fill out their green husks, and the oaks and hickories carry heavy crops of developing acorns and nuts that will feed the deer, turkeys, and squirrels through winter. The persimmons hang hard and astringent, awaiting the first frosts of fall to sweeten. The shortleaf pine stands deep green on the Ozark ridges, and the bottomland sycamores begin to look tired and dusty in the late-summer heat.
Go deeper with the Missouri guides
The complete Missouri birding, native-plant, wildflower, and night-sky guides — or the whole year in one bundle.
Same month elsewhere: August in Montana · August in Nebraska · August in Nevada