EHD Was Confirmed in Illinois This Month. Here Is How to Check Your Own Ground Before Opening Day.
What EHD Is and Why 2026 Created the Conditions for It
Epizootic hemorrhagic disease is not new to Illinois. It is a virus transmitted by biting midges — specifically Culicoides sonorensis, a tiny fly that breeds in wet mud at the margins of ponds, creeks, and shallow water sources. EHD is not contagious between deer. It is transmitted when a midge bites an infected deer and then bites another. The virus causes internal bleeding, high fever, and acute dehydration. Affected deer seek water compulsively, which is why most EHD mortalities are found at or near water.
The conditions for a significant EHD year require two things to come together: a large midge population, and deer concentrated on water sources during peak midge activity in August and early September. The 2026 drought delivered both. Nineteen central Illinois counties were in extreme drought at some point during July and August, which shrank water sources across Cass, Fulton, Morgan, Menard, Sangamon, and Pike counties to muddy margins — exactly the breeding habitat midges prefer. Deer that would normally be distributed across multiple water sources in a typical summer were pushed onto a handful of remaining wet spots, and midge populations in those locations were dense. IDNR confirmed the first cases on September 15. The full impact of the outbreak will not be visible until hunters and landowners are on the ground in October and November.
What to Look For on Your Property This Week
If you have not walked your water sources since mid-August, do it this week before archery season opens. The window between now and October 1 is when EHD mortality becomes visible — deer that were infected in late August and early September will have died by now, and their remains will be concentrated near the water they were seeking when the disease progressed.
Walk every pond, creek, and seep on the property. Look along the banks and in the shallows — EHD-affected deer frequently die in or immediately adjacent to water. In the timber, look for areas where multiple deer have been present near water recently: heavy tracks in dried mud, browse pressure around creek banks where vegetation remains green. Deer that survived the acute phase may show up in trail camera photos looking thin with poor coat condition in October.
Note the condition of your water sources specifically as they were in August. Ponds that dropped to less than a foot of depth with exposed mud margins, creek pools that shrank to isolated puddles, drainage ditches that held the last standing water in a dry field — these are the locations where midge breeding was heaviest and where your risk exposure was highest. If those locations are on a neighbor's property rather than yours, the exposure still reached your ground through deer movement.
Dead deer near water in late September after a dry summer are EHD until proven otherwise. IDNR asks that you report suspected EHD mortalities using the online wildlife mortality reporting form at the IDNR website. Include the county, the approximate location, and the date found. This data helps the department track the geographic scope of the outbreak and publish updated information for hunters and landowners as the season progresses.
What EHD Does — and Does Not — Do to Your Deer Herd
The impact of an EHD outbreak is localized and varies dramatically by the severity of the drought, the density of the midge population at specific water sources, and the size of the deer herd going into the event. A farm that lost three or four deer to EHD in a dry August is experiencing a normal bad year, not a population collapse. A farm where the pond and the adjacent creek were the last water within a half-mile radius, and where deer were concentrated at those locations through the heat of July and August, may have lost a more meaningful portion of its local herd.
EHD tends to hit adult bucks disproportionately because dominant bucks hold smaller home ranges in summer and return to the same water sources repeatedly. A mature buck that visited a midge-infested pond daily through August had repeated exposure that a young deer moving across a larger area may not have had. Whether this matters to your hunting season depends on how many mature bucks were on the property going in and how concentrated their summer movement was.
The good news — and it is real good news — is that deer populations recover from EHD. The disease does not persist in the environment the way CWD does. Once the first frost kills the midge population, transmission stops. Deer that survive develop immunity to the serotype they were exposed to. Fawn crops from the following spring are largely unaffected. A farm that takes a meaningful EHD hit in 2026 will typically see population recovery within two to three seasons if habitat and hunting pressure are managed appropriately during that period.
What a Localized EHD Hit Does and Does Not Do to Land Value
If you are buying or selling hunting ground in Cass, Fulton, Morgan, Menard, or Pike County this fall, EHD is a factor in the conversation but not the way some buyers will try to make it. Here is the distinction that matters for a real estate transaction.
EHD mortality is an event, not a permanent condition. A farm that lost several deer to the 2026 outbreak is not permanently impaired as a hunting property. The terrain, the habitat structure, the timber and food source arrangement that attracted deer to that property in the first place are unchanged. Deer from the surrounding area will repopulate the ground. A buyer who uses a confirmed EHD hit as justification for a 20 to 30 percent price reduction on a well-structured hunting property is using a temporary event to extract a permanent discount, and a seller who accepts that reasoning is making a mistake.
Where EHD legitimately matters in a land transaction is when a seller is marketing a property specifically on the basis of its documented mature buck history and those bucks may be gone. Trail camera pictures from 2024 and 2025 showing five shooters do not guarantee those deer are still alive in October 2026. A buyer should verify current deer sign and current trail camera activity before closing on any hunting property this fall, regardless of EHD, and a seller should be transparent about what recent trail cameras are showing.
The October 1 opener is ten days out. Walk your ground, check your water sources, report what you find, and get your cameras out this week. The information you collect now is more valuable than anything from last season.
Jared Williams is the Managing Broker and owner of Archer Realty & Auction LLC. He spent 13 years as a producer for the Outdoor Channel before returning to Illinois to build a land brokerage rooted in operator-level expertise in recreational real estate across central and western Illinois. Start the conversation at archerrealty.net.
