Wyoming Nature Guide: October 2026
October is the close of autumn in Wyoming — the cottonwoods turning gold in the river bottoms, the last aspen color fading from the high slopes, big flocks of waterfowl and cranes pushing south, and the first snows whitening the peaks. The garden is done in most of the state, and winter's long approach begins.
What to look for this week
- Thousands of elk and Trumpeter Swans hold on the National Elk Refuge at Jackson, the signature Wyoming winter spectacle, with goldeneye on the open spring creeks.
- The Quadrantid meteor shower peaks in a short, sharp burst around January 3 — watch after midnight from a dark Red Desert pullout away from town lights.
- A planning week: order the ultra-short-season seed Wyoming's high valleys depend on before it sells out, and check stored potatoes and squash for rot.
Birds This Month
October is the height of waterfowl and late migration in Wyoming. The reservoirs, rivers, and refuges fill with southbound flocks — Canada geese, tundra swans, mallards, northern pintail, green-winged teal, American wigeon, gadwall, redhead, canvasback, and diving ducks staging on the open water at Seedskadee NWR and the big reservoirs. The last Sandhill Cranes bugle south, and white-fronted and snow geese pass over in some years. Bald Eagles gather along the rivers as the fish runs and waterfowl concentrate.
Sparrows move through in numbers — white-crowned, white-throated, Harris's, fox, song, and the first American tree sparrows arriving for winter — and the late raptors push along the ridges, with the year's first Rough-legged Hawks and northern shrikes appearing from the north. Mountain bluebirds flock and drift south, and the high country empties of its summer birds. By month's end the winter cast settles in: Golden Eagles, prairie falcons, and irruptive finches in the towns.
This month's tip: scope the reservoirs and open river stretches for staging waterfowl and check brushy field edges and weedy ditches for the sparrow flocks — October is the bridge between the last migrants and the arriving winter birds.
What's Blooming
October all but ends Wyoming's wildflower year as hard frosts sweep the state. In the warmest, most sheltered basins the last rabbitbrush finishes its gold and a few late asters, goldenrod, and gumweed hang on into the first part of the month before the freezes take them. After that the landscape is given over to seed and structure: the silvery, curing plumes of needlegrass, bluebunch wheatgrass, and other native bunchgrasses catching the low autumn light, the dried heads of lupine, paintbrush, and blanketflower, and the drifting seed cotton of fireweed and clematis. The orange hips of wild rose and the blue berry-like cones of Rocky Mountain juniper brighten the fading flats. Indoors, gardeners pot up the last herbs and force bulbs as the outdoor blooming year shuts down for good.
Garden This Month
October is the garden's shutdown across most of Wyoming. The hard freezes have ended production everywhere except the few cold frames and low tunnels where kale, spinach, and mache push on under cover. The work now is cleanup and protection: pull and compost spent plants (discarding any diseased material), harvest the last carrots, beets, and cabbage before the ground freezes hard, and lift and cure the final potatoes, onions, and winter squash for storage.
Put the beds to bed for the long, hard, windy winter. Plant garlic early in the month so it roots before the freeze, then mulch it and the perennials, strawberries, and any marginal plantings heavily with straw or leaves — insulation matters enormously where winter brings deep cold and bare, wind-scoured ground between snows. Mulch or cover-crop empty beds against erosion, drain and store hoses and irrigation, clean and oil tools, and wrap young fruit-tree trunks against sunscald and rodents before the snow comes.
Zone 3b (Jackson Hole, high valleys): the garden is done and likely under early snow — finish cleanup, mulch perennials and strawberries deeply, and get garlic in the ground before it freezes solid if you haven't already. Drain hoses and put the season fully away.
Zone 4a (high basins, Lander, Cody): the hard freezes end the season this month — pull and compost spent plants, harvest the last hardy greens and roots, plant garlic, and mulch beds heavily against the coming cold and wind.
What's at the Farmers Market
October winds Wyoming's outdoor markets toward their seasonal close, with the storage harvest filling the last tables. Expect the full run of keeping crops — potatoes, onions, winter squash, pumpkins, carrots, beets, turnips, parsnips, and cabbage — along with the last frost-sweetened kale and greens and the season's apples and fresh cider from the warmer valleys. The state's grass-fed beef, lamb, and bison come into their main fall sales as ranchers market stock.
Look for the new crop of Wyoming honey, jarred preserves and chokecherry jelly, and dried beans and grains from the larger farms. Cure squash and pumpkins in a cool, dry room, store potatoes, onions, and roots cool, dark, and ventilated for months of keeping, and keep apples cold and separate, as their ethylene hastens ripening in everything nearby.
Night Sky This Month
October is one of Wyoming's three best months for the night sky, with long, cold, increasingly dry and transparent nights under famously dark skies. The Red Desert and southwest basins, and the backcountry of Yellowstone and Grand Teton, remain premier dark-sky destinations, with town-edge sites near Lander, Pinedale, and Saratoga easily showing the Milky Way and the deep-sky wealth of autumn.
The autumn sky stands high: the Great Square of Pegasus dominates overhead, the chain of Andromeda leads to the naked-eye glow of the Andromeda Galaxy (M31) and the fainter Triangulum Galaxy (M33), and Cassiopeia's star clusters ride the rising winter Milky Way in the northeast. By late evening brilliant Capella and the Pleiades climb the east ahead of winter. The Orionid meteor shower, debris of Halley's Comet, peaks in late October, best after midnight from a dark site with an open eastern horizon.
Exact planet positions and this year's Orionid timing shift year to year — the printable Wyoming night-sky guide lists the dates and the darkest viewing sites near you.
Butterflies & Pollinators
October closes Wyoming's butterfly season as the hard frosts settle in. Early in the month, on warm, sunny, sheltered afternoons in the lower basins, a few hardy adults still fly — painted ladies and West Coast ladies heading south, clouded and orange sulphurs at the last rabbitbrush and aster, and the occasional mourning cloak or California tortoiseshell basking on sun-warmed rock or bark before retreating to hibernation. These overwintering adults are now seeking their winter shelters — the loose bark of cottonwoods, woodpiles, rock crevices, and outbuildings along the river corridors — where their built-in antifreeze will carry them through the subzero months. The migrants have mostly departed for the south, the monarchs long gone from the valley milkweed. By late October, with snow on the peaks and frost in the basins nearly every night, the flying season is effectively over, and the next butterfly will not appear over the snowmelt until March.
Trees This Month
October finishes Wyoming's autumn color in the lowlands as the high country goes bare. The aspen gold has mostly fallen from the mountain slopes, leaving the pale chalk-white trunks standing among the dark conifers, but the plains cottonwoods hit their peak now, the gallery groves along the Green, Snake, North Platte, and Bighorn blazing brilliant gold against the sage before the wind strips them. The streamside willows and boxelders turn yellow, and the chokecherry and serviceberry thickets color red and orange in the draws.
The conifers settle in for winter. Lodgepole pine, Douglas-fir, Engelmann spruce, and subalpine fir hold their dark green as the first snows whiten the high slopes, and the limber and whitebark pines on the ridges stand against the early storms, their seed crop now cached by Clark's nutcrackers. On the dry foothills the Rocky Mountain junipers show their blue cones. By month's end the deciduous trees are largely bare, the leaves down, and the bones of the winter landscape stand revealed.
Go deeper with the Wyoming guides
The complete Wyoming birding, native-plant, wildflower, and night-sky guides — or the whole year in one bundle.
Same month elsewhere: October in Alabama · October in Arizona · October in Arkansas