What to look for in nature in South Dakota this April

Is April the best month to watch prairie grouse dance in South Dakota?

• The Forest Service grouse blinds near Fort Pierre

  Reservations on the 2026 page ran April 1 to May 15; check the 2027 dates in February · Fort Pierre National Grassland, south of Pierre and north of Interstate 90

  The Forest Service sets up plywood blinds each spring beside active leks and lends them out free of charge. Reservations are required, and requests have opened on February 1 of each year (the next business day if that falls on a weekend). The page we read said guests must arrive an hour before sunrise and stay at least an hour after it, that each blind has a designated parking spot marked with pin flags, and that the blinds move to a new lek every year, so no two seasons look quite alike. Each visitor receives a map and instructions. The page lists no drinking water and gives no restroom information, so bring what you need and dress warmly, since a clear April dawn on open grass can sit near freezing even when the afternoon will be mild. The reservation line is 605-224-5517.

• Greater prairie-chickens and sharp-tailed grouse

  Displays continue through spring, ahead of nesting in May and June · Native mixed-grass prairie, especially in the central part of the state

  South Dakota Birds and Birding describes the greater prairie-chicken as relatively common in the central part of the state, with males gathering on traditional leks to inflate orange neck sacs, stamp and give a deep, hooting boom, and with nesting following in May and June. You hear the show before you see it. If you cannot book a blind, a parked vehicle on a public grassland road gives a respectable view. Keep to the road, stay in the car and leave before the birds do.

• Sage-grouse on the clay flats of Harding and Butte counties

  Peak lekking in April or early May · Far northwestern South Dakota

  The agency’s management document says South Dakota leks sit on large clay flats with sparse vegetation. The birds that remain are few, and a visitor on foot is a risk to a lek. The responsible way to enjoy this species is to follow the agency’s annual counts, not to go looking.

When are bison calves born in the Black Hills and Badlands?

• Calving at Custer State Park

  First calves in early April some years; the busiest weeks are usually mid-April into the first couple of weeks of May · Custer State Park, with calves also reported in the Badlands

  A KELOLAND report dated April 3, 2021 quoted the park’s visitor services manager on the first calf of that year: about 475 were expected, against a five-year average near 425, from a herd of roughly 1,450 animals. The park put prime calving at mid-April into the first couple of weeks of May. A 2023 report from South Dakota Public Broadcasting said that year’s first calf was found a day after a storm dropped close to two feet of snow, and described calves as usually arriving in late April or early May. The safe reading is that early April can bring a few and the main wave runs through the rest of the month into May.

  Park staff told KOTA that visitors should leave a solitary calf alone, since the cow knows where she left it and comes back. Do not feed, call to or approach calves, and keep well away from any cow with young.

• Other young animals, with a caution about dates

  Late April into June, depending on species and weather · Needles Highway, Custer State Park, the Badlands and prairie dog towns

  A regional tourism association blog says mountain goat kids and bighorn lambs begin to appear on rocky terrain in April, and that the youngest prairie dogs emerge in early April. That is one marketing source. The National Park Service gives a different clock: prairie dogs there mate from March into early April, and pups stay underground about six weeks, which puts most pups on the surface later in spring. Treat April as a time to watch the towns and May as the likelier time for pups. Burrowing owls are mostly a summer sight around the towns, according to the Badlands bird list.

Which birds return to South Dakota’s lakes and rivers in April?

• Piping plovers and least terns on Missouri River sandbars

  Plovers arrive in April; most nests are started in May and June · Sandbars and shorelines along the Missouri River reservoirs, including Lake Oahe, and the river reaches below the dams

  The state’s management plan for these two rare birds says piping plovers reach the Northern Great Plains in April, with males staking out territories through aerial displays and calls. Nesting runs from late April through August, with most nests started in May and June. People matter a great deal: the plan records that the Army Corps of Engineers attributed 20 least tern and 38 piping plover nest failures in South Dakota to human disturbance during its monitoring period, and it names foot traffic, off-road vehicles and unleashed dogs as threats. If a stretch of sand is marked off, stay out.

• White pelicans, loons and the first swallows

  April and May for pelicans; April is a good month for tree swallows over open water · Large lakes of the prairie pothole country in the east, reservoirs and wetlands

  South Dakota Birds and Birding says American white pelicans are typically easy to find in April and May as they migrate toward their breeding grounds, and a few nest on isolated islands in the northeast. The bump on a pelican’s bill is only present in the breeding season, so a flock with knobbed bills is dressed for courtship. Common loons pass through and may still wear breeding plumage in spring. The same site calls the tree swallow usually the first swallow to return in spring, able to survive cold spells by eating berries and seeds when insects are scarce.

• Sand Lake as the ice goes out

  Ice-out varies by weeks · Sand Lake National Wildlife Refuge, Brown County

  The refuge’s 2023 reports show how much a late spring can reshuffle things. On April 11 the lake was mostly frozen apart from a sliver of open water at the dam, about 30 geese were passing over in small flocks, and staff saw more raptors. They expected the birds to move onto the refuge once about a quarter of the lake was open. By April 26 the last ice was nearly gone and a good mix of puddle ducks, diving ducks, gulls, herons, pelicans and cormorants had shown up. Check the refuge page before you drive, because roads and tour loops can stay closed in a wet spring.

• Trumpeter swans at Lacreek

  Nesting April through July · Lacreek National Wildlife Refuge, near Martin, in the southwest

  South Dakota Birds and Birding lists April through July as nesting time for trumpeter swans, which nest in select spots in western South Dakota. The Fish and Wildlife Service describes the 16,570-acre Lacreek refuge as a place of vital winter habitat for these swans and as a staging area for migrating waterfowl. Watch from a distance, because a swan on a nest is easily frightened off it.

• A rare white crane

  Spring migration; any day is a long shot · Central South Dakota wetlands and flooded fields

  The whooping crane is a rare but regular migrant, according to South Dakota Birds and Birding, seen mostly in the middle of the state, with single birds or pairs often tagging along with sandhill cranes. Give any tall white crane plenty of room and report it to a wildlife agency without posting the location.

When do walleye spawn in South Dakota?

• April, with the peak often in the third week

  Spawning runs through April; a 2020 interview with the state fisheries administrator put the peak in the third week · Gravel shorelines and tributary mouths of eastern lakes, and the Missouri River system

  Because day length is part of the trigger, that interview said the peak of walleye spawning in South Dakota generally falls in about the third week in April, though the start of the run shifts with ice-out and weather, and a late spring can push the first egg-take close to the end of the month. Treat the date as a typical value, not a schedule. The Game, Fish and Parks department treats spawning as a major work initiative, with fisheries staff from across the state helping to net fish and collect eggs. The waters used in recent years have included Lake Oahe, Indian Springs, Sinai, Brush, West 81, Twin, Lynn, Mid Lynn, Reid and East Oakwood lakes.

What blooms in the Black Hills and on the prairie in April?

• Pasque flowers, still going in the Hills

  Early spring; later at higher elevation · Mixed-grass prairie and open pine forest, low to high elevations

  The Forest Service calls the pasque flower one of the first blooms of early spring, common in mixed-grass prairie and open pine forest at all elevations, and notes that the fuzzy plant makes wispy, tufted seed heads in midsummer. The Park Service says it flowers as early as March at Wind Cave, well before the park’s main wildflower season, which runs from mid-May through early July. Visit one patch twice this month. The contrast between a blossom and a seed head makes a good page for a field journal.

• Bluebells and the rest of the early group

  Late April into May, depending on elevation · Grasslands, open forests and rocky slopes

  The Forest Service’s list of spring-to-early-summer wildflowers includes lanceleaf bluebells, whose drooping blue clusters appear in early spring, along with darkthroat shootingstar, star lily, early cinquefoil, desert biscuitroot and, on higher limestone slopes in the west, yellow arrowleaf balsamroot. The page gives no bloom date for each plant, so use it as an identification list and expect low, sunny, south-facing slopes to bloom first.

Which frogs, toads and turtles are active in South Dakota in April?

• Boreal chorus frogs and the end of the wood frog window

  Chorus frogs through late spring; wood frogs typically finish by early April · Shallow wetlands, ditches and temporary pools

  The state herp site says wood frogs breed in a short period, typically late March into early April, while the boreal chorus frog begins calling as early as March and continues to late May, with a breeding call that sounds like a comb being strummed. Both are small and hard to see. Stand still beside the water for a few minutes and the chorus stops and restarts around you.

• Tiger salamanders on rainy nights

  Active April through September; spring movements follow heavy rain · Near wetlands, in old burrows and sometimes basements

  The same site says adult tiger salamanders are rarely encountered, since most movement to and from breeding ponds happens in early spring during and just after heavy rains, and the adults are generally active from April to September. If you find one on a wet road, move it the way it was heading, with wet hands.

• What you will not hear yet

  Mid-May to July · Prairie wetlands, flooded fields and ephemeral pools

  The northern leopard frog breeds primarily from mid-May through June, and the American toad mostly in May and June. The Canadian toad, found only in the northeast corner, breeds from late May to June. The Great Plains toad breeds from late May through July and the plains spadefoot, an explosive breeder, calls for a night or two after heavy rain. If you hear an April trill from a roadside pool, think chorus frog first.

What is April weather like in South Dakota?

When is the last spring freeze in South Dakota?

How much daylight does South Dakota gain in April?

What can you see in the South Dakota night sky in April 2027?

• The Pink Moon

  Full on Tuesday, Apr 20; best evening that day · Rising in the east around sunset

  On Tuesday the 20th the Moon reaches full at 5:27 p.m. CDT (4:27 p.m. MDT), a few hours before it clears the eastern horizon. Because it is already full when it appears, that evening is the best one to choose. A level horizon, such as the open breaks above the Missouri or any wide prairie, shows the rising disc well. Step outside close to sunset and look east.

• The Lyrid meteor shower, a poor year

  Active about Apr 14 to Apr 30; peak around the evening of Thursday, Apr 22 · Look northeast to east, away from town lights

  Plan a short watch. The shower is active from about the 14th through the 30th, and the International Meteor Organization excerpt we found has the peak at roughly 8:41 p.m. CDT (7:41 p.m. MDT) on Thursday the 22nd; our own computation says about 14 minutes later. The trouble is a bright, nearly full Moon that rises between roughly 10 and 11 p.m. in South Dakota. Only a couple of hours remain between the sky going properly dark and moonrise, with Lyra low in the northeast. Expect a handful per hour, well under the 20 or so per hour that the American Meteor Society cites for ideal conditions. Lyrids now and then surprise, but not on cue.

• Jupiter, Mars and the Moon

  Evenings through the month; Moon near Jupiter on Apr 14 and 15 · High in the south after dark

  Face south after dusk and look for the bright planet Jupiter, in the Leo and Cancer region. Mars, fainter but steady and reaching about magnitude 0.0 by mid-April, sits farther along in Leo. Jupiter is a late-night planet this month, visible well after most people have gone to bed. The Moon visits both: it passes Jupiter on the 14th and 15th, at under a degree on the 15th, and sits about three degrees from Mars that same day.

• Venus in the dawn, Saturn out of sight

  Venus before sunrise all month; a thin crescent Moon nearby on Apr 3 and 4 · Low in the east before sunrise

  Early risers on a ranch road or a lakeshore will spot Venus first. It lifts clear of the horizon some 75 minutes before sunrise on the 1st and fades into the glow week by week. A slim old Moon lies nearby before dawn on Saturday the 3rd and Sunday the 4th. Saturn, which the Sun overtakes on April 7, is not worth a search until May.

• The Milky Way’s return

  Before dawn, best around the Apr 6 new moon · Dark prairie and Black Hills sites

  The Milky Way’s bright core returns to the predawn sky in April. Our computation for 40 degrees north shows dark-core windows of up to about 2.3 hours from April 1 to 14 and April 28 to 30. South Dakota lies farther north, so expect somewhat less, and check the Moon first.

What can South Dakota families do outdoors in April 2027?

• Celebrate Arbor Day on Friday, April 30

  Friday, April 30, 2027 · Your yard, a school or a park

  Codified Law 1-5-10 sets the last Friday in April apart as South Dakota’s tree planting day, making Friday, April 30 the day this year. It asks schools, civic groups and individual citizens to plant a tree and to care for the woody plants around them. Pick a species suited to your soil, call before you dig, and water it through its first summer.

• Mark Earth Day and join a bioblitz

  Earth Day is Thursday, April 22; the City Nature Challenge photo weekend is April 30 to May 3 · Anywhere with plants and animals

  Earth Day is April 22 every year. The City Nature Challenge’s own site lists photo-taking for 2027 as April 30 to May 3, with identifying through May 16. It is organized by city, so check whether a South Dakota area is taking part before you plan around it; the iNaturalist app also works for your own records.

• Keep a first-of-the-year list

  All month · A yard, a gravel road or a lake edge

  Note the day you first see a pelican, a tree swallow, a bluebird or a pasque flower, and hear your first chorus frog. Share dates with Journey North or the state herp website, never nest or den locations.

• Take a park or refuge trip with realistic expectations

  Check conditions the week before · Custer State Park, Wind Cave, the Badlands, Sand Lake, Lake Andes and Lacreek

  Refuge roads and tour loops can stay closed while the ground is wet, as the Sand Lake reports from 2023 showed. Call ahead, pack binoculars, and hand a young naturalist the notebook to log every species.

Safety notes for April in South Dakota

• Spring turkey and light goose seasons

  Prairie turkey seasons have opened in mid-April; the light goose order has run to mid-May · Statewide; check unit rules

  The Game, Fish and Parks Commission’s rule covered the 2025 and 2026 seasons: single-season prairie units ran April 12 to May 31 in 2025 and April 11 to May 31 in 2026, and the Black Hills and archery units opened April 26 and April 25. Only a bow, a shotgun with shot shells or a muzzleloading shotgun may be used. Shooting a turkey in a tree or roost is barred, and shooting is allowed from 30 minutes before sunrise until sunset. At its July 2026 meeting the Commission finalized further spring turkey changes, including county units for Day and Codington and a closure of Bennett and Sanborn counties to spring firearm turkey hunting, but we did not find the 2027 season dates, so check the agency before planning. We found no blaze orange requirement in the rule text. The 2026 conservation order for light geese covered February 16 through May 15 statewide, for snow, blue and Ross’s geese only; look for the 2027 order on the agency’s site.

• Bison, elk and mothers with young

  All month, especially mid-April on · Custer State Park, Wind Cave, the Badlands

  Stay inside the vehicle where the park says to, use binoculars, and give any animal with a young one a very wide berth. Do not move a calf that looks abandoned.

• Storms, wind and ticks

  All month; ticks from the first warm days · Open prairie, river breaks, brush and grass

  Check the forecast for thunderstorms and know where you would shelter on open grassland. Watch for water over gravel roads, and for dust and smoke on windy days. On ticks, SDSU Extension points out that blacklegged ticks can transmit Lyme disease and anaplasmosis, that permethrin sprayed on clothing repels ticks, and that a body check after time outdoors is wise.

• Water and sandbars

  All month · Lakes, rivers and reservoirs

  April water is cold. Wear a life jacket, keep off sandbars where plovers and terns are nesting, and leash dogs near any open shoreline.