Late Summer Wildflowers: A Field Guide to August's Blooms

Field report

A classic wildflower surge returns, two peak bloom weeks arrive, and the meadow takes center stage.

Welcome to the August wildflower show! We're fast approaching the return of fall and cooler morning temperatures, so if you haven't yet wandered a meadow trail and taken some time to look down, this is the month to check that box!

Catch the First Surge of Goldenrod Along Roadsides (Aug. 1)

August's first signature bloom, the tall goldenrod, will begin lighting up field edges across the Eastern Seaboard by the first of the month. And if you happen to miss the initial display, no worries—there will be a repeat performance this month, with a second wave of late-summer composites bursting into color by Aug. 30!

The goldenrod gets an unfair reputation as an allergy culprit—ragweed, which blooms at the same time, is the real villain. Other late-summer blooms include Joe-Pye weed, with its dusty pink flower heads that smell faintly of vanilla, and ironweed, whose deep purple blooms tower over damp meadows. In wetland areas, cardinal flower sends up scarlet spikes that hummingbirds simply cannot resist, the red so vivid it seems to glow at dusk.

August's goldenrod is also the opening act for the prairie's peak season—a time when tallgrass fields reach their full height, some stalks topping seven feet. The combination of goldenrod, blazing star, and big bluestem creates a landscape so rich in texture and color that early settlers described it as an ocean of flowers, and it's easy to see why.

A Great Year for the Monarch Butterfly Migration (Aug. 13)

Regarded as one of the most remarkable natural events of the year, the monarch butterfly migration begins building in August and peaks around the second week. Unlike last year, when stormy weather disrupted the early arrivals, this August offers favorable conditions for watching the migration unfold in all its orange-winged glory. May we recommend a prairie walk at sunset?

The migration, sometimes producing streams of hundreds of butterflies per hour, is driven by a generational relay unlike anything else in nature. These monarchs are the "super generation"—born in late summer, they live eight times longer than their spring parents and travel over 2,500 miles to reach oyamel fir forests in central Mexico, a place none of them have ever seen. They navigate using the sun's position and Earth's magnetic field, an internal compass refined over millions of years.

If the monarch population were to collapse entirely, scientists believe the loss of this migration would be one of the great ecological tragedies of our time. The eastern monarch population has declined by over 80% in the last two decades, driven by habitat loss, herbicides, and climate shifts. For now, you can take in the beauty of these travelers by walking any meadow thick with blazing star and goldenrod—the nectar sources they depend on most.

The Late-Summer Pause Brings Still, Humid Mornings (Aug. 16)

Should poor weather spoil your wildflower walk during the peak of the monarch migration, the fortunate timing of a brief calm spell shortly after will extend the window for observing lingering butterflies. This is also an ideal time to slow down and search the meadow floor for less showy blooms—nodding wild onion, closed gentian, and the ghostly white of snake-root—flowers easily overlooked when the prairie is blazing with color.

Wander Deep Into the Tallgrass Prairie at Its Peak (All month)

As it turns out, the physical presence of a long-term romantic partner is linked to health benefits, like a sense of safety and reduced stress—which can lead to better sleep. "By signaling recent physical proximity, the mere scent of a partner may have similar benefits," notes the University.

Hofer says that the study could lead to more research looking at easy and effective ways to improve sleep, "such as bringing a partner's shirt the next time you travel alone."

August is peak prairie season in the northern latitudes, providing not only comfortable temperatures for wading through chest-high grasses but also the most dramatic display of wildflowers all year.