South Dakota Coverage
Big Sioux Corridor Duck Migration Forecast
Brookings down through Sioux Falls. A narrow river flight lane rather than basin country, and it hunts best on the push.
See today’s live scoreAll of SD
Season dates: South Dakota duck season 2026-27, dates and migration timing
Where Big Sioux Corridor is
Big Sioux Corridor is drawn from 6 counties in South Dakota: Brookings, Lake, Lincoln, McCook, Minnehaha and Moody. Those are the counties its shape on the DuckCast map is built from, so a hunter in any of them reads this region’s score.
When Big Sioux Corridor peaks
DuckCast’s season model puts the mallard peak here around mid November. Big Sioux Corridor carries its own mallard timing rather than the statewide curve, because the season here runs on a different clock from the rest of the state. That is a modelled typical curve, not a prediction for any single year. The actual push depends on cold fronts and freeze-up upstream, which is what the daily score tracks. Always confirm season dates with the state wildlife agency, linked below.
What DuckCast watches upstream of Big Sioux Corridor
3 upstream stations feed this region's freeze line, nearest first: Fargo, ND, about 215 miles north, Jamestown, ND, about 235 miles northwest and Grand Forks, ND, about 285 miles north. When those stations ice over, the score here starts climbing before anything changes in the local sky.
Radar over Big Sioux Corridor
Each morning DuckCast reads the night’s NEXRAD data from KFSD, the National Weather Service radar at Sioux Falls, about 15 miles south of the region’s weather point. That is close enough for the radar to sample the air over the region itself. Radar sees every bird in the air, not only ducks, so it confirms or questions the score rather than moving it.
Locations stay generalized
Hunter reports for Big Sioux Corridor are always shown at the region level. DuckCast never collects or displays exact coordinates, so filing a report here never burns a spot.
Also covered in South Dakota
Nearest first. Distances run between the regions’ weather points.
- Lewis and Clark, about 70 miles southwest
- Glacial Lakes, about 80 miles north
- Mid James Valley, about 90 miles northwest
- Prairie Coteau, about 105 miles north
- Sand Lake and the Upper James, about 145 miles northwest
- Oahe and the Missouri, about 175 miles west
- Grand River Country, about 295 miles northwest
- Cheyenne River and the Hills, about 310 miles west
Season dates and regulations change. Always verify with SD Game, Fish and Parks. DuckCast forecasts conditions, not legal seasons.