Iowa Nature Guide: June 2026
June settles Iowa into summer. The prairie hits its early peak, grassland birds sing through long warm days, fireflies rise from the meadows at dusk, and the first strawberries and garden harvests come in. Migration is over and the nesting season is in full swing across the state.
What to look for this week
- Feeders are at their winter peak — chickadees, nuthatches, and cardinals work the seed, while wintering bald eagles already crowd the open water below the Mississippi dams at Keokuk and Le Claire.
- The Quadrantid meteor shower peaks in a short, sharp burst around January 3; watch the northeast after midnight from a dark site like the Loess Hills ridges.
- A planning week — order seeds early and favor the short-season varieties that finish reliably in northern Iowa's cold.
Birds This Month
June is nesting season, and Iowa's breeding birds are at their most vocal. The prairie and hayfield chorus is the signature sound: bobolinks bubbling overhead, dickcissels buzzing endlessly from fence wires and forbs, eastern and western meadowlarks, grasshopper sparrows, and sedge wrens filling the grasslands at Neal Smith NWR and the Loess Hills prairies. In the timber, Baltimore orioles, rose-breasted grosbeaks, indigo buntings, scarlet tanagers, and wood thrushes sing through the long mornings.
Around farms and towns, ring-necked pheasants crow from the fencerows, house wrens and eastern bluebirds fill nest boxes, barn swallows wheel over the fields, and American goldfinches — the late-nesting state bird — only now begin to pair up, waiting for thistle down. American white pelicans and great blue herons work the marshes and rivers.
This month's tip: walk a prairie at dawn for the grassland-bird chorus, and watch your nest boxes — bluebird and wren broods fledge through June, and a quiet check reveals the nesting cycle at its peak.
What's Blooming
June is the start of the great prairie bloom in Iowa. The early summer prairie flowers come on strong: purple lead plant, the tall pink-purple pale purple coneflower, white and purple prairie clovers, black-eyed Susan, butterfly milkweed with its blazing orange heads, common milkweed in fragrant pink globes, and the spires of wild quinine and Culver's root. The state flower, the wild prairie rose, blooms pink along roadsides and prairie edges all month.
In wetlands and ditches, blue flag iris and swamp milkweed appear, and the woodland edges hold elderberry and the last wild black raspberry blossoms. Gardens overflow with peonies, irises, roses, and the first daylilies. June's prairie is fresh, varied, and humming with bees and butterflies as the summer flowers begin their months-long succession.
Garden This Month
June shifts the Iowa garden from planting to growing and the first harvests. Finish setting out any remaining warm-season transplants, and direct-sow successions of bush beans, sweet corn, and summer squash for a staggered harvest. The cool-season crops wind down — pick peas, lettuce, spinach, and radishes before the lengthening heat makes them bolt and turn bitter, and replant those beds with heat-tolerant crops.
This is the month to stay ahead of weeds while they are small, to mulch tomatoes, peppers, and squash to conserve the soil moisture Iowa's summers can quickly draw down, and to begin watching for pests: Colorado potato beetles, squash bugs, and cucumber beetles all appear now. Stake and cage tomatoes before they sprawl, side-dress heavy feeders, and harvest the first strawberries, garlic scapes, and summer squash as the garden begins to give back.
Zone 4b (far north Iowa): with frost finally past, finish planting any remaining warm-season crops early in the month, sow a second round of beans and sweet corn, and mulch to conserve moisture as the short, intense northern summer begins.
Zone 5b (southern Iowa): the garden is in full production — harvest peas, lettuce, and the first summer squash, and as the heat builds, switch cool-season beds over to heat-tolerant crops like okra, southern peas, and sweet potatoes.
Zone 6a (far southeast Iowa): the warmest corner is well into summer; keep tomatoes and peppers evenly watered, succession-sow beans, and shade or skip lettuce, which bolts quickly in the early heat here.
What's at the Farmers Market
June is when Iowa markets shift into the summer harvest. Strawberries are the headline crop early in the month, plump and fully ripe from local patches, and they sell out fast. Asparagus finishes its season as peas, the first summer squash and zucchini, new potatoes, beets, carrots, and broccoli come on, alongside abundant lettuce, spinach, green onions, and cooking greens.
Fresh herbs are plentiful, rhubarb is still going, and the first cut flowers — peonies, irises, and early summer bouquets — brighten the stands. Look for honey, eggs, and cheese as well. Buy strawberries fully ripe and use them within a day or two, since they won't sweeten further and bruise easily; refrigerate them unwashed in a single layer, and keep new potatoes cool and out of the light.
Night Sky This Month
June carries Iowa's shortest nights of the year around the summer solstice near June 21, so darkness comes late and lasts only a few hours — but those hours bring the rising summer sky. The Summer Triangle of Vega, Deneb, and Altair climbs in the east through the evening, and overhead the keystone of Hercules carries the Great Globular Cluster (M13), a fine telescope target. Low in the south, the curving tail of Scorpius with red Antares begins to appear.
As the sky fully darkens late, the band of the summer Milky Way rises in the east, its richest star fields toward Sagittarius climbing later in the night — best seen from a truly dark site such as the Loess Hills, away from the glow of Des Moines and the river cities. Warm nights make June ideal for relaxed, late-evening stargazing.
Exact planet positions vary year to year — the printable Iowa night-sky guide gives the current month's details for your location.
Butterflies & Pollinators
June fills Iowa's prairies, gardens, and roadsides with butterflies. The summer monarch generation is breeding actively, with caterpillars feeding on milkweed across the state. Eastern tiger and black swallowtails are abundant, joined by great spangled fritillaries emerging from their violet host plants and nectaring at coneflower and milkweed. Pearl crescents, silvery checkerspots, and a range of skippers dart through the grasses, and monarchs, sulphurs, and painted ladies work the blooming prairie.
On the highest-quality remnant prairies — the Loess Hills and the reconstructed grassland at Neal Smith NWR among them — June marks the emergence of the magnificent regal fritillary, one of North America's rarest and most spectacular prairie butterflies, now largely confined to a handful of states where good prairie survives. Iowa is a stronghold for this declining species, and a June visit to a quality prairie offers one of the best chances anywhere to see it gliding low over the flowers.
Trees This Month
By June, Iowa's trees are in full summer leaf and putting on the year's growth. The eastern cottonwoods finish releasing their drifting seed cotton along the rivers, and the black locusts and catalpas bloom with showy, fragrant white flower clusters that draw bees. The basswood (American linden) prepares its own intensely fragrant midsummer flowers, a favorite of honeybees.
The oaks have set their tiny acorns, the black walnuts their small green nuts, and the shagbark hickories their developing fruit, all swelling quietly through the warm months toward the fall drop. In the bottomlands, the silver maples and green ashes shade the rivers, while on the dry ridges the bur oaks spread their wide, deep-green crowns — the architecture of the oak savanna that once graced the edge of Iowa's prairie.
Go deeper with the Iowa guides
The complete Iowa birding, native-plant, wildflower, and night-sky guides — or the whole year in one bundle.
Same month elsewhere: June in Kansas · June in Kentucky · June in Louisiana