Morel Season in Iowa: Soil Temperature, Elms and Access

Iowa morels run from early April through mid May, and the Iowa DNR gives 53 degree soil temperature as the point to start looking. Timber is the harder problem. Only about eight percent of Iowa is forest and nearly all of it sits in private hands, so you plan an Iowa season around access first and weather second.

Iowa morels run from early April through mid May, and the Iowa DNR gives you one number to start from. Once soil temperature reaches 53 degrees, begin looking. The harder question in Iowa is where. Iowa grows corn on ground that used to be woods, and somebody owns almost all of the scattered, narrow timber that remains, so you plan an Iowa season around access first and weather second.

Why Iowa timber is the scarce part

Iowa holds roughly 3 million acres of trees and forests, a thin cover for a state this size, while most states in the region carry several times that share. The timber is uneven, too. It survives where the plow could not go, in creek bottoms, on steep river bluffs and in the awkward corners of farms. From a satellite, Iowa's woods look like thin green threads running through a grid of fields.

Iowa was tallgrass prairie before settlement, with its timber concentrated along the rivers. What survives today follows those same drainage lines, minus the parts cleared for crops and pasture. So an Iowa timber map looks less like a forest and more like a river network drawn in trees.

Ownership makes the problem worse. Iowa woodland is overwhelmingly private, much of it still attached to working farms, and public ownership covers only around eight percent of the forest land area. The whole state forest system runs to under 45,000 acres across ten units, set against roughly 3 million acres of trees and forests statewide. Without family timber, you are competing for a very small amount of open ground, or knocking on doors.

For you, that means driving. Timber in central Iowa comes in thin strips that can sit twenty minutes apart, so a productive season is usually three or four small spots, seldom one good woods. None of that makes Iowa a poor morel state. Thin timber packs the mushrooms and the hunters into the same narrow strips, which is part of why Iowa morel culture runs as hot as it does.

The northeast corner is the upside. It shares the unglaciated Driftless country that runs on into southwest Wisconsin, and it holds more timber and steeper ground than the rest of the state.

When do morels come up in Iowa?

Take a soil reading and leave the calendar aside. The Iowa DNR names 53 degrees as the temperature to start looking, and that number tells you more than any published date.

The DNR pairs daytime temperatures in the 60s with nights in the 50s, then adds soil, slope, shade and moisture to the decision. You need all of them, because one warm afternoon does not describe the shaded timber where you will actually search. Take your reading where you intend to hunt, since a shaded north bottom and a sunny south bank on the same eighty acres can sit several degrees apart in the same hour.

Warm rain releases a flush, and the soil temperature has to come first. Rain on ground that has not reached temperature does nothing, while rain on ground that has sat at 53 degrees for several days can bring a flush within the week. Recent rain becomes useful when the soil is already near the DNR's 53 F starting clue and stays moist. Keep checking the same site as those conditions develop, but do not count a fixed number of days from one rain to a flush.

The plant cues the DNR lists cost nothing to check. Oak leaves the size of squirrel ears, budding lilac and mayapple leaves opened like umbrellas all appear on its list of signs to start searching. One reading does not make a season, so check the same ground every few days once it is close, because spring soil moves faster than most people expect.

Small gray morels are the usual first find. They are young, and on damp shaded ground they will keep growing, so leaving some and coming back often gives you more than a full basket taken early.

How to read a dying elm

Elm is still the best tree in Iowa, but only for a narrow stretch of its death. The DNR is specific about which ones pay, and you can read the mark from thirty feet.

Work the tree that still carries bark but almost no leaves. That combination says the elm died recently enough that the ground around it has not moved on. Once the bark has fallen away and the trunk stands bare and gray, that elm has usually finished, and hunters lose seasons returning to the same skeleton because it produced three springs ago.

Work the tree itself, starting at the trunk and spiraling outward to about the width of the crown, since the root system occupied that ground. Give an elm that produced last spring one more check, and rarely a third. Noting the year it went bare tells you roughly how many springs it has left.

Orchards behave differently, and the DNR says so directly. Old apple orchards can stay productive longer than an elm does, so an abandoned farmstead deserves more attention than its size suggests. Iowa's true morels are the same handful of species across the state, and a tree that works in Allamakee County works the same way in Fremont.

Where do morels grow in Iowa?

Iowa timber survives in a small number of shapes. Learning those shapes narrows your search far faster than learning more tree species.

River bottoms are the backbone of Iowa morel hunting. They hold moisture after the open ground has dried out, which stretches a short state season by a week or more at the end. Black morels turn up in the sandier bottoms and the pine plantings earlier than the yellows do elsewhere in the state.

The Loess Hills are their own case in a state with little steep ground. Wind-blown soil piled into steep bluffs along the Missouri, and those west-facing slopes warm fast and dry out just as fast. Northeast Iowa breaks most of the patterns on this page. Allamakee, Clayton and Winneshiek hold the steepest and most heavily timbered ground in the state, and you work slope aspect there the way any Driftless hunter does.

Creek islands and timber edges are on the DNR's own list, and most hunters walk straight past both. Islands take effort to reach, and edges look too exposed to bother with, so both stay unpicked.

Ground you may legally walk in Iowa

Iowa access divides into four kinds of ground, and each one follows its own rule.

• State forests and state parks, which are open and small, with the state forests totalling under 45,000 acres
• County conservation board parks, which are common in Iowa and set their own rules locally
• The public hunting atlas, covering roughly 764,000 acres of ground open to public hunting
• Private farm timber, which is most of the state's woods and needs a conversation

The walk-in access program is the trap to know about. Iowa enrolls private tracts in its Habitat and Access Program for public walk-in hunting, and those contracts cover hunting only, with other activities prohibited. The sign at the gate is about deer and turkeys, so a walk-in tract gives you no morel permission, and picking there falls outside what the landowner agreed to.

County conservation ground is the underused option. Iowa counties run their own parks and wildlife areas, the rules vary by county, and a phone call to the county board answers the question in a minute. The four major state forest units sit on ground that was too rough or too sandy to plow, which is exactly why the state could buy it, so public timber in Iowa is largely the land nobody wanted.

Private permission is still where most Iowa morels come from. Landowners asked in February or March, and asked about mushrooms instead of hunting, say yes more often than people expect. Make the request easy to accept. Name the mushrooms, name the weeks, offer to share what you find, and make clear you will not drive on the ground or leave gates open.

When you ask carries as much weight as how you ask, and on farm ground it carries more. Asked in March, a landowner has time to think it over, while the same question on a Saturday morning in late April sounds like somebody already standing in the driveway. Once you are through the gate, basic rules for safe foraging carry extra weight on borrowed ground, because the next hunter's permission depends on how you behave.

Farm-country hazards in the morel check

Row-crop country puts one hazard in front of you that timbered states do not. The Iowa DNR advises collecting away from ground treated with pesticides or exposed to heavy metals. Field edges are where that caution bites. Timber margins against a sprayed field are exactly the sort of warm, open ground that produces early, and they are the ground most likely to have caught drift.

Walking twenty yards deeper into the timber costs almost nothing and removes the question entirely. The deeper timber is better hunting anyway, since interior ground holds moisture longer than a wind-exposed edge, so walking in usually pays twice. April also puts armed hunters in the same woods, and Iowa DNR tells mushroom hunters to wear blaze orange and to avoid red, white and blue, the colors of a tom turkey's head.

Then there is the mushroom itself. False morels have wrinkled, lobed or brain-like caps with no pits, and cutting one open reveals cottony tissue where a true morel has an empty chamber.

Your 53 F soil reading times an Iowa walk, but it says nothing about the identity or condition of the mushrooms you find there. Check every specimen, remove damaged or slimy mushrooms, and follow the raw-morel safety steps before the harvest reaches a plate.

Iowa DNR is blunt about raw morels. Morels are unsafe raw, they need thorough cooking, and the DNR advises cooking them before freezing them. The FDA documented illness after people ate raw or undercooked true morels. Cooking lowers preparation risk without guaranteeing safety.

If illness follows a mushroom meal, contact a healthcare provider or Poison Control at 1-800-222-1222 promptly. Save raw specimens, cooked leftovers and field photographs so a specialist can identify the mushroom.