Wisconsin Nature Guide: December 2026
December is the onset of deep winter in Wisconsin — the marshes frozen, the snow settling in from the north, and the year's longest nights opening the brilliant winter sky. The feeders fill with hardy birds, snowy owls patrol the open country, and the holiday Christmas Bird Counts take to the field.
What to look for this week
- Feeders are at their winter peak — black-capped chickadees, nuthatches, and cardinals work the seed, while irruptive redpolls and pine siskins may turn up in a northern-finch year.
- The Quadrantid meteor shower peaks in a short, sharp burst around January 3; watch the northeast after midnight from a dark site away from city lights.
- A planning week — order seeds early, especially the short-season varieties northern Wisconsin gardens depend on, before they sell out.
Birds This Month
December settles Wisconsin into its winter birding. The feeders are the center of activity — black-capped chickadees, white-breasted and red-breasted nuthatches, downy and hairy woodpeckers, northern cardinals, dark-eyed juncos, and American tree sparrows are reliable, with irruptive common redpolls, pine siskins, and grosbeaks possible in finch years. Bald eagles gather on the open water below dams on the Wisconsin and Mississippi rivers as the lakes freeze.
The marquee winter birds are out in the open country: snowy owls hunt farm fields, airports, and the Lake Michigan and Lake Superior harbors, rough-legged hawks hover over marshes and fields, and northern shrikes perch in hedgerows. Up north, boreal chickadees, pine grosbeaks, and the occasional great gray or northern hawk owl reward the bundled birder. December is also Christmas Bird Count season, the long-running citizen-science survey held statewide.
This month's tip: join a local Christmas Bird Count, keep feeders full and water open through the cold, and check open farmland and harbors for wintering snowy owls.
What's Blooming
Nothing blooms outdoors in a Wisconsin December — the ground is frozen and snow-covered statewide, and the wildflowers are months from returning. The winter landscape's interest is all in structure and seed: the persistent fruit of winterberry holly, highbush cranberry, and bittersweet glowing red against the snow, the crimson stems of red-osier dogwood along the marsh edges, and the bleached, snow-capped seed heads of coneflower, black-eyed Susan, and the tawny prairie grasses standing through the drifts.
Evergreen boughs, holly, and the berries of native shrubs take on their seasonal role in winter decoration. Indoors, this is amaryllis, paperwhite, poinsettia, and forced-bulb season, the houseplant displays standing in for the dormant garden. It's also the start of the catalog-and-planning season, when gardeners begin dreaming over next year's beds in the deep of winter.
Garden This Month
December gardening in Wisconsin is indoor and reflective work. The beds are frozen and snow-covered statewide, so the outdoor tasks are minimal: make sure mulch and snow cover are protecting garlic, perennials, strawberries, and fall-planted bulbs, and gently knock heavy, wet snow off evergreen and arborvitae branches to prevent breakage (but leave the light, dry snow as insulation). Watch for and brush off heavy ice loads, and keep evergreens shielded from drying winter winds and road salt.
Indoors, this is the season of planning and rest. Review the past year's notes, inventory leftover seeds, and start browsing catalogs for next year — especially the short-season varieties northern gardens need. Tend houseplants and forced bulbs through the low winter light, sharpen and care for stored tools, and let the garden sleep. Living holiday greenery and cut Wisconsin-grown Christmas trees, fresh from the state's many tree farms, bring the garden indoors for the season.
Zone 3b (far north): the garden is fully dormant under deep snow — the best insulation it gets. Leave it banked over perennials, knock heavy wet snow off evergreens, and turn to planning and seed catalogs for the long winter.
Zone 4b (central Wisconsin): nothing to do outdoors but ensure mulch and snow are protecting perennials, garlic, and tender plants. Plan next year's garden, inventory and order seeds, and care for houseplants and forced bulbs indoors.
Zone 5b (Milwaukee & lakeshore): even the lake-warmed southeast is freezing now — finish any last mulching, protect evergreens from winter burn and salt, and gather seed catalogs for winter planning.
What's at the Farmers Market
December markets are winter markets, centered on storage crops and the holidays. The indoor winter markets — Madison's Dane County Winter Market among the largest in the nation — carry the keeping harvest: storage onions, garlic, potatoes, carrots, beets, parsnips, rutabagas, cabbage, and winter squash, with frost-sweetened Brussels sprouts and hardy greens from cold storage and hoop houses. Wisconsin apples, fresh and frozen cranberries, and the state's celebrated cheeses are holiday staples.
The season adds cut Christmas trees, wreaths, and evergreen boughs from Wisconsin's tree farms, plus maple syrup, honey, jams, and other preserved goods that make local holiday gifts. Greenhouse microgreens and salad greens supply fresh winter produce. Store roots cool, dark, and humid and squash cool and dry; keep cranberries refrigerated or frozen, and they'll easily last through the holiday season and beyond.
Night Sky This Month
December brings the winter solstice and Wisconsin's longest nights, with the brilliant winter sky returning in full. Orion climbs the southeastern sky, his belt pointing down to Sirius and up to orange Aldebaran in Taurus, beside the lovely Pleiades cluster. The bright stars of the Winter Hexagon assemble overhead, and Gemini and Auriga ride high — the cold, dry air gives some of the sharpest, most transparent skies of the year.
The Geminid meteor shower peaks around December 14, one of the richest and most reliable showers of the year, with bright, plentiful meteors radiating from Gemini and visible all night from a dark site — bundle up, as it falls in the deep cold. On the darkest nights from the northwoods and Door County's Newport State Park, watch the northern horizon for the aurora borealis.
For exact planet positions and this year's Geminid peak timing and moonlight, consult the printable Wisconsin night-sky guide for your part of the state.
Butterflies & Pollinators
There are no butterflies on the wing in a Wisconsin December — the deep cold and snow have ended all activity statewide. The summer's butterflies survive the winter hidden in dormant forms across the frozen landscape: monarchs cluster by the millions in the high oyamel fir forests of central Mexico, thousands of miles from the milkweed of their birth, while the species that overwinter here wait out the cold close at hand. Mourning cloaks, eastern commas, and question marks hibernate as adults wedged behind loose bark, in hollow logs, and in unheated outbuildings, protected by the glycerol antifreeze in their bodies. Others, like the great spangled fritillary and red admiral, pass the winter as tiny caterpillars or chrysalides tucked in leaf litter and on stems. December is a month for the butterfly gardener to dream and plan — and to leave the leaf litter, standing stems, and brush piles undisturbed, sheltering the next generation through the long cold until spring.
Trees This Month
December's trees are fully dormant, and winter is when the conifers define the Wisconsin landscape. Eastern white pine holds its soft blue-green needles alongside red pine, white and black spruce, and balsam fir across the northwoods — these and the state's many Christmas-tree farms supply the season's fresh-cut trees and greenery. The deciduous trees stand bare and their winter silhouettes become readable: the white trunks of paper birch, the shaggy bark of shagbark hickory, and the broad, gnarled crowns of old bur oaks on the savanna ridges.
The marcescent tan leaves of young red and bur oaks and ironwood cling and rattle in the cold wind, while the bare tamaracks mark the frozen bogs, having dropped their gold needles in late October. The trees rest now, buds set and waiting, carrying the green of the conifers and the structure of the bare hardwoods through the heart of the Wisconsin winter.
Go deeper with the Wisconsin guides
The complete Wisconsin birding, native-plant, wildflower, and night-sky guides — or the whole year in one bundle.
Same month elsewhere: December in Wyoming · December in Alabama · December in Arizona