May is the lush green peak of Kentucky's spring — the warbler migration crests in the eastern mountains, the tulip poplars flower high in the canopy, the first strawberries ripen, and the gardens move into full warm-season planting. It is the best birding and one of the most exuberant months of the Kentucky year.
Week by week in May
April 30 – May 6
- The warbler wave crests — cerulean, blackburnian, magnolia, and chestnut-sided warblers pour through the woods.
- The Eta Aquariid meteor shower, debris from Halley's Comet, peaks around May 5–6 in the pre-dawn hours.
- The main warm-season planting begins in central Kentucky — set out tomatoes, peppers, squash, and beans.
May 7–13
- Scarlet tanagers, rose-breasted grosbeaks, and indigo buntings arrive to nest, and the dawn chorus is at its richest.
- Native mountain laurel opens its pink-and-white blooms along the sandstone cliffs of the Red River Gorge.
- The state tree, the tulip poplar, opens its green-and-orange tulip-shaped flowers high in the canopy.
May 14–20
- On the reclaimed mine grasslands of the eastern coalfields, the secretive Henslow's sparrow sings — a Kentucky specialty.
- The first dead-ripe Kentucky strawberries arrive, the highlight of the spring market tables.
- Swallowtails puddle on damp gravel along the gorge streams on warm afternoons.
May 21–27
- Fragrant white black locust flowers drape the woodland edges and perfume the warm evenings.
- Whip-poor-wills and chuck-will's-widows call through the warm nights in the forests.
- Watch for the late 'blackberry winter' cold snap before committing tender plants in the eastern mountains.
May 28 – June 3
- The pastures fill with black-eyed Susan, fiery orange butterfly milkweed, and the first purple coneflower.
- The great spangled fritillaries emerge and begin nectaring on milkweed and coneflower in the meadows.
- Native rhododendron blooms along the eastern mountain streams in the Cumberland highlands.
Birds This Month
May is the peak of Kentucky's spring bird migration and the best birding of the year. The warbler wave crests in the first two weeks — cerulean, hooded, Kentucky, black-throated green, blackburnian, magnolia, and chestnut-sided warblers pour through the woods, with the Cumberland Plateau and the Red River Gorge hosting breeding ceruleans and worm-eating warblers in their mature forests. Scarlet tanagers, rose-breasted grosbeaks, indigo buntings, and wood thrushes arrive to nest.
The breeding season is in full swing statewide: ruby-throated hummingbirds are nesting, great crested flycatchers, eastern wood-pewees, and Acadian flycatchers call from the canopy, and the grasslands fill with displaying dickcissels, grasshopper sparrows, and — on the reclaimed mine grasslands of the eastern coalfields — the secretive Henslow's sparrow, a Kentucky specialty. Whip-poor-wills and chuck-will's-widows call through the warm nights in the forests. Get out early; the dawn chorus is at its richest now.
What's Blooming
May shifts Kentucky's bloom from the woodland floor to the canopy, edges, and open country. The last spring ephemerals — late large-flowered trilliums, wild geranium, Solomon's seal, mayapple, and jack-in-the-pulpit — finish under the closing canopy, while the rocky open woods and gorge ledges glow with scarlet fire pink and the woodland edges fill with wild blue phlox and the first fleabane and golden ragwort.
The flowering shrubs peak: native mountain laurel opens its pink-and-white blooms along the sandstone cliffs of the Red River Gorge and the Cumberland Plateau, a signature Kentucky display, and flame azalea lights the eastern slopes. The pastures and roadsides take on their early-summer look with ox-eye daisy, clovers, and the first blackberry blossoms. In gardens the peonies, irises, roses, and clematis bloom, and the late lilacs and dogwoods finish the spring flush.
Garden This Month
May is the great warm-season planting month across Kentucky. With the last frost past in most of the state, set out tomatoes, peppers, eggplant, squash, cucumbers, and beans, and direct-sow sweet corn, melons, okra, and sweet potatoes as the soil warms. Mulch the new transplants to hold moisture and suppress weeds, and stake or cage tomatoes early. The cool-season crops planted earlier — lettuce, spinach, peas, and radishes — are now harvesting, and successions of beans and corn can go in every couple of weeks.
In the eastern mountains, wait until mid-May and watch for the late cold snaps before setting out tender crops. Statewide, May is also the month to plant warm-season annuals and to keep ahead of the fast-growing weeds and the first flush of pests — squash bugs, cucumber beetles, and Colorado potato beetles all appear now. Pinch back basil and herbs to keep them bushy, and side-dress heavy feeders as they take off in the lengthening, warming days.
Zone 6a (the eastern mountains & Cumberland Plateau): the last frost finally passes in early May here — wait until mid-month to set out tomatoes, peppers, and squash in the cold mountain hollows, and watch for the late "blackberry winter" cold snap before committing tender plants.
Zone 6b (central Kentucky & the Bluegrass): the main warm-season planting window — set out tomatoes, peppers, eggplant, squash, cucumbers, and beans and direct-sow sweet corn and melons around Lexington and Louisville once the soil is reliably warm.
Zone 7a (the far western Purchase region): warm-season planting is already underway — get successions of beans, corn, squash, and cucumbers in, set out sweet potato slips, and begin the first cool-season harvests before the heat builds.
What's at the Farmers Market
May is when Kentucky's farmers markets hit their full spring stride. The first strawberries — picked dead-ripe and intensely sweet — arrive mid-month and are the highlight of the tables, alongside the season's asparagus, rhubarb, and an abundance of tender greens: leaf lettuce, spinach, arugula, radishes, green onions, spring turnips, and the first new potatoes. Morels may still appear early in the month from the cooler eastern woods.
This is the biggest bedding-plant, herb, and seedling season of the year, with markets and nurseries packed with vegetable starts, hanging baskets, and native perennials. Fresh-cut spring flowers, eggs, honey, and artisan goods round out the stalls. Choose strawberries that are fully red and fragrant with no white shoulders — they won't sweeten further once picked — and refrigerate them dry and unwashed, using within a day or two before they soften.
Night Sky This Month
May's warm, comfortable nights make it one of the easiest months to stargaze in Kentucky, and the dark-sky sites are in full season. The Red River Gorge overlooks, the Land Between the Lakes and its Golden Pond Observatory, Bernheim Forest, and the Bluegrass and Louisville astronomy clubs all run spring star parties under the milder skies.
The spring constellations rule the evening: Leo sinks toward the west, Boötes rides high with brilliant orange Arcturus, and blue-white Spica in Virgo shines to the south, with the keystone of Hercules and its great globular cluster (M13) climbing in the east. Late in the night the summer Milky Way begins to rise in the southeast. The minor Eta Aquariid meteor shower, debris from Halley's Comet, peaks around May 5–6, favoring the pre-dawn hours from a dark southern horizon. The printable Kentucky night-sky guide lists this year's exact meteor timing, Moon phase, and planet positions for your county.
Butterflies & Pollinators
May brings Kentucky's butterfly fauna to a full, diverse showing. The big swallowtails are all on the wing — eastern tiger, the iridescent pipevine, the bottomland zebra, the dark spicebush, and the black swallowtail over gardens and open ground — and they nectar heavily on the blooming mountain laurel, clover, and phlox. The forest edges and trails of the Red River Gorge are excellent now, with swallowtails puddling on damp gravel along the streams.
The smaller butterflies multiply too: spring azures, eastern tailed-blues, pearl crescents, American and painted ladies, red admirals, the bright red-spotted purple mimicking the toxic pipevine swallowtail, and the year's first silver-spotted skippers and hackberry emperors. Monarchs are now breeding across the state, their caterpillars feeding on the milkweed in the pastures and roadsides. May is a fine month to walk a woodland trail or a flowering meadow and tally a dozen or more species on a warm afternoon.
What to plant for them is in the Kentucky native plants guide
Trees This Month
May is full leaf-out and the flowering of the canopy across Kentucky. The state tree, the tulip poplar, opens its large green-and-orange tulip-shaped flowers high in the crown — easiest to spot from the dropped petals on the ground — and the black locust hangs the woodland edges with fragrant white pea-flowers that perfume the warm evenings. The catalpa follows with its showy white blossom clusters late in the month.
In the understory and along the cliffs, native mountain laurel blooms pink and white along the sandstone of the Red River Gorge and the Cumberland Plateau, a signature display, while flame azalea lights the eastern slopes. The oaks and hickories finish leafing out and shed their pollen, the late-leafing trees that closed the spring canopy. The last white blossoms of black cherry and the green flowers of the pawpaws finish in the bottomlands, and the forest settles into its deep summer green for the season ahead.
The Kentucky native plants guide covers what grows with them
Weather & Daylight
Across Kentucky, a typical May day averages a high near 77°F and a low near 54°F, with about 5.1 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Warm and increasingly humid, upper 70s by day and mild mid-50s nights, with the year's heaviest rains soaking the season.
| Average high | 77°F |
|---|---|
| Average low | 54°F |
| Precipitation | 5.1 in |
| Sunrise (mid-month) | 6:30 ET |
| Sunset (mid-month) | 20:41 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 Kentucky's next month turns — what's arriving, blooming, and worth a night outside.
Go deeper with the Kentucky guides
The complete Kentucky birding, native-plant, and night-sky references — or the whole year, week by week, in one book.
Same month elsewhere: May in Louisiana · May in Maine · May in Maryland