DMU Jefferson, Wisconsin

Jefferson County sits on gently rolling glacial till plains averaging 800 to 1,000 feet elevation, the product of heavy glaciation that left a landscape of drumlins running north-south north of the Bark River and east of the Rock River. The county is predominantly agricultural — corn, soybeans, and dairy pasture dominate the uplands — but nearly 20 percent of the land surface is water or wetland. Major rivers include the Rock, Crawfish, Bark, Ashippun, and Scuppernong. Lake Koshkonong, a 10,595-acre shallow reservoir formed by damming the Rock River, anchors the southern end of the county. Wooded draws, brushy fence lines, and isolated woodlots provide deer cover within the ag matrix. Jefferson Marsh Wildlife Area features a 900-acre tamarack bog — a rare and wild habitat island in this otherwise open southern Wisconsin landscape.

Pressure is moderate to high, driven by Jefferson County''s location between Milwaukee and Madison — two of Wisconsin''s largest urban centers — and the county''s limited public land footprint. WMAs draw predictable crowds during the nine-day gun season, particularly on opening weekend. Hunters who secure permission on private farm ground in the more rural eastern and northern portions of the county will find significantly less competition. Archery season sees lighter pressure and gives dedicated bowhunters a shot at mature bucks before gun hunters push deer into cover. The county does not carry the trophy reputation of Buffalo or Richland counties to the west, which reduces the draw of out-of-county trophy hunters.

Jefferson County is in the Southern Farmland Zone. Standard deer hunting licenses automatically include free antlerless harvest authorizations — Southern Farmland units typically receive two to five per license depending on local population goals set by the county CDAC. Additional bonus antlerless harvest authorizations are available for purchase separately; for the 2026 season WDNR set 700 public-land and 2,500 private-land bonus authorizations for Jefferson County at $12 for residents and $20 for nonresidents, going on sale August 19, 2026. There is no earn-a-buck requirement. Authorizations are county- and land-type-specific — hunters must designate public or private land at the time of purchase. Any unfilled antlerless authorization may be used during archery, gun, muzzleloader, antlerless-only, or holiday hunt seasons. CWD has been confirmed in Jefferson County (first detected 2005, with roughly 0.8 percent positivity rate from approximately 8,476 tests); mandatory sampling and carcass transport restrictions apply.

Deer seasons for 2025-26 run archery and crossbow from September 13 through January 4, youth gun October 11-12, nine-day gun season November 22-30, muzzleloader December 1-10, antlerless-only December 11-14, and the antlerless holiday hunt December 24 through January 1. Wild turkey is available in both spring (April-May) and fall seasons; the county''s ag-edge habitat holds good turkey numbers. Jefferson Marsh and Lake Koshkonong provide strong waterfowl hunting for mallards, wood ducks, and diving ducks. Pheasant hunting is permitted at select WMAs and dove hunting is available at Jefferson Marsh. Grouse opportunities are marginal given limited contiguous forest. No bear seasons apply to Jefferson County. Hunters must review current CWD regulations, including mandatory sampling zones and restrictions on transporting whole deer carcasses out of the county.

Jefferson County rewards hunters willing to put in work on private land access. The farmland-edge habitat — wide cornfields buffered by brushy draws, wetland margins, and isolated woodlots — creates classic funnel and ambush setups during the early November rut when bucks are on their feet connecting doe bedding areas to food. Jefferson Marsh is the sleeper pick on public land: 3,000 acres of wetland and tamarack bog east of town that sees fewer hunters than the proximity to Milwaukee would suggest and offers a surprisingly remote deer hunting experience for southern Wisconsin. Lake Koshkonong and the Rock River corridor concentrate deer movement along travel corridors in late season when standing crops are gone. The county is not a trophy destination on the level of Buffalo or Richland counties — Boone and Crockett entries are sparse — but hunters with consistent private access regularly take respectable 2.5- to 3.5-year-old bucks. The generous antlerless tag structure makes Jefferson an excellent unit for filling the freezer while hunting deer-rich farmland ground.