Early Successional Deer Habitat: What the Research Measured

STEP 1 · Plant succession

Habitat for deer follows a timeline you can see on foot

Vegetation develops through a series of stages that determines available food and shelter. Missouri's extension publication lays out that progression under the state's climate. Annual plants occupy exposed soil first. Perennial growth later shades out many annuals; vines and shrubs arrive next, and trees able to tolerate shade ultimately form a closed canopy. Prescribed burns, soil disking and herbicides turn the process back. Logging and grazing can also do so. Exposed soil in sunlight activates buried seeds. Deer find feeding areas, beds and cover for fleeing danger in the growth that follows.

Green growth alone does not make a useful patch; its arrangement matters. The mixture Missouri describes as ideal includes native grasses that grow in clumps during the warm season, broadleaf forbs, and widely spaced shrubs, including blackberry, sumac and dogwoods. Unmowed forbs can reach heights of 3 to 6 feet, concealing fawns and providing places to bed in winter. Deer consume very little grass during summer, so those grasses supply winter shelter and fuel for burning. Purdue's extension publication distinguishes herbaceous growth with some shrubs in early succession from the woody young-forest stage. The latter develops through seedlings or sprouts from stumps following timber removal, a fire, a tornado or tree disease. Those stages follow different timelines.

STEP 2 · Forage by stage

When tree crowns close, forage drops from thousands to about a hundred pounds

Purdue's January 2020 publication, written by Brooke with Zischke, Whitford and Cox, gives each stage a forage weight. A comparable decline appears in the Southeast figures published by Mississippi State's extension program.

Purdue puts canopy closure in young forests at ages of 10 to 20 years, frequently sooner. Shade then removes forbs and brambles, while woody stems become too tall to browse. Shelter may persist even when food no longer does. Acorns become the chief food beneath that closed roof, but Purdue describes the crop as unreliable: white oaks produce a good crop just 2 out of every 5 years. The guide identifies southern Indiana forests in the regeneration figure's caption. Treat the figures as evidence of how far stages differ, rather than a prediction for your woods.

STEP 3 · Timber cuts

The cutting method sets the upper limit for forage

Among these publications, Purdue offers the clearest regeneration comparison in a single table.

Purdue distinguishes between clearcutting to grow a new forest and clearing land to turn it into a field or home site. The guide leaves open whether the group-selection number was measured within the opening or averaged across the stand. The single-tree row calls for care: removing scattered trees adds little sunlight to the forest floor. That method gives sugar maple and beech, which can tolerate shade, an advantage over oak.

That publication gives three descriptions of a thinning with 30 percent canopy removal. It says even a 30 percent removal can double forage. An accompanying callout says cover and forage can increase greatly, while the table gives a per-acre span of 100 to 750 pounds. Work from that span instead of counting on twice the forage. Adding a burn after thinning produces much larger multiples: forage reaches 3 to 5 times what the same stand provides with thinning alone, or 3 to 8 times what a stand provides without either treatment. Per-acre production exceeds 1,000 pounds. Missouri's woodland extension publication also ties burn response to the amount of light that hits the ground. Get sunlight in before burning.

Missouri describes the same trend without listing forage weights. Clearcuts encourage vegetation in early succession over five to seven years. For a large property short on habitat variety, the guide calls five to 10 gaps desirable, each covering 1 to 5 acres for every 100 wooded acres. It describes temporary gaps as 3 to 5 acres, bordered by an uneven edge.

STEP 4 · Fire and disking

How often fire returns determines whether forbs or shrubs are favored

Missouri's guide to early successional habitat describes prescribed fire as the most effective management tool by a wide margin in most situations. The time between burns determines the plant community. Burning every one to two years encourages grasses and forbs, while waiting three to five years allows shrubs to grow. An interval of two to four years is often advised for grasses, forbs, and scattered shrubs together. Fire during the growing season reduces grasses and encourages forbs and legumes. Burns conducted from January to March, during the dormant season, usually maintain the plant mix already there. For invading woody plants such as green ash or red maple, late summer or early fall is a better time to burn. Dormant-season and spring fires often kill their tops without killing the plants.

Missouri also advises keeping freshly burned patches beside patches that have gone one, two, or three years without fire. The University of Georgia review (Hopper, D'Angelo, and Kohl, 2021) gives specific dimensions for this patchwork in the Southeast: spread burn units covering 10 to 30 acres throughout a deer's 600 to 700 acres of home range, and vary the time between burns, the season, and the intensity. According to the review, freshly burned areas lack cover that conceals fawns. Males favor unburned areas during hunting season for the protective cover found there. Fire will be ineffective in a stand whose canopy is completely closed unless gaps are opened first.

Soil disking resets growth without burning. Missouri commonly advises strips measuring 30 to 50 feet across, worked on a rotation lasting three years. Each year, disk another third of the field, putting vegetation aged 1 year, 2 years and 3 years in neighboring strips. The Georgia review and the extension guides from Missouri and Purdue all advise using a burn plan and getting experienced assistance. Burning laws differ by state.

STEP 5 · Tennessee fire trial

Forage tripled with canopy cuts followed by fire

Both Missouri's and Purdue's guides recommend the 2011 study by Lashley, Harper, Bates, and Keyser for further reading. We read about the study only in the Oak Fire Science research brief. We did not consult the paper.

Researchers worked in northeastern Tennessee at Chuck Swan State Forest and Wildlife Management Area. Each of four upland hardwood stands was split into 12 units of two acres each. Starting basal area ranged from 87 to 105 square feet per acre. Shelterwood and retention cutting reduced it to roughly 56 square feet per acre. Low-intensity burns took place in April, with flames 6 to 18 inches long. Retention units were burned three times during 6 years. Forage sampling took place from July to September in years 6 and 7. Deer density was 25 to 30 per square mile, with 8 to 10 deer harvested per square mile each year. According to the brief, that density was not viewed as too high.

Combining fire with either shelterwood or retention cutting made forage availability more than triple that in untreated plots. At seven years, nutritional carrying capacity exceeded the controls under every treatment. Burning by itself increased forage, yet did not lower the understory's woody proportion or raise its herbaceous proportion. With retention cutting, broadcast herbicide left both plant composition and carrying capacity unchanged after one or two years. Seedlings arriving from nearby trees replaced the plants killed by spraying. For each kilogram of forage, a retention cut followed by burning cost about as much as warm-season plantings. Options that included herbicide were least economical.

The trial has two boundaries. Its fires returned at intervals of 2 to 4 years. The summary's management advice instead says forage, mast and fawning shelter may be maintained by burning every 3 to 5 years. It also points to Wood (1988) and Shaw and colleagues (2010), whose studies show the effect of a single burn does not last long. Deer numbers were not excessive at this site, so it did not test timber already stripped of browse. Comparing these timber treatments with food plots requires looking at nutrition; our native browse guide addresses that question.

STEP 6 · Browsing pressure

High browsing pressure from deer can eat up fresh growth

In their 2010 study, Crimmins, Edwards, Ford, Keyser, and Crum sampled a central Appalachian site where deer density had dropped by more than half. Timber harvest there had risen since 2001. During summer 2007, they measured woody browse inside and alongside 12 clearcuts ranging from 0 to 5 years old. The cut interiors had more browse and greater browsing rates than the edges or mature woods. Overall browsing rates dropped from roughly 17 percent in 2001 to less than 5 percent. The authors suggest that managing deer numbers together with increased timber harvest across the area can lower browsing to a level that may allow forest growth without interference. The abstract does not distinguish the effects of those two measures.

Research published in 2009 from Miller, Campbell, Laseter, Ford and Miller found a similar pattern in a research forest in West Virginia. The researchers sampled regeneration aged 1 to 6 years during 2001 to 2004, finding that woody plants attained their greatest plot coverage by growing season four, and herbivory dropped sharply as habitat in early succession expanded. The authors see the association as suggesting that even-aged managed forest, spread well across about 14 percent of the landscape, can greatly reduce herbivory. The 14 percent figure comes from that single location; it is no standard for a small patch of woods. We based this account on the abstract.

The Georgia review explains how deer abundance affects the outcome. It says burning may be less than ideal where deer are plentiful, because browsing could prevent plants from getting established again. With low to moderate deer abundance, browsing following a disturbance can increase the number of nonwoody plant species.

STEP 7 · Source limits

Questions these publications do not answer

Our reading of abstracts and a research summary for Lashley 2011, Crimmins 2010, and Miller 2009 covers three field studies. Those summaries report measurements of browsing and forage; they do not report where deer traveled during hunting season. Forage figures describe a growth stage's potential food output. Here, the Georgia synthesis alone makes a hunting-season statement, concerning males using cover in areas left unburned. Geographic settings also differ: Missouri, southern Indiana, the Southeast, the central Appalachians and eastern Tennessee.

Apply similar care to hinge-cutting. Purdue treats it more as a way to manage deer than to improve a timber stand. It supplies food and shelter immediately during winter or early spring. Much of that browse, however, sits beyond a deer's reach, and the surviving tops continue to block sunlight at ground level. Cutting the tree all the way down or using herbicide to kill it often produces a better result.

STEP 8 · Field method

Assess your timber before following this work sequence

Purdue offers a five-question assessment. Does mature timber with a closed canopy dominate your forest? Is growth beneath the trees absent? Are oaks lacking among the upper trees or in lower growth? Do American beech and sugar maple fill the understory? Are invasive plants a common sight? Purdue says answering yes to any question signals that limited food or shelter likely restricts the woods' value to deer. We drew the following order from those publications. Each step traces to a source above, but no source tested this sequence.

Here is our opinion, separate from the source claims: for a small tract of woods, devote the first day with a chainsaw to getting sunlight onto the ground. That could mean canopy removal of about 30 percent or an opening covering 3 to 5 acres. Save hinge-cutting for afterward. We draw that view from the differences in Purdue's regeneration data and its warnings on hinge-cutting. No experiment tested this sequence on your property. If deer already exceed what the food supply can support, address the herd first.