Voles are overwhelmingly herbivorous, feeding mainly on grasses, sedges, roots, bark, and seeds, though several species will opportunistically eat insects, fungi, and other animal matter when the chance arises. Because there are roughly 150 species of voles spread across North America, Europe, and Asia, the specifics vary, but the family portrait is consistent: these small rodents are dedicated plant-eaters with a seasonal flexibility that lets them thrive in habitats from alpine tundra to suburban lawns. What makes their diet especially interesting is how actively voles shape the plant communities around them through their feeding choices.
The Core Menu
If you could summarize a vole’s grocery list in a few words, it would be “green, leafy, and close to the ground.” Grasses and grass-like plants make up the bulk of the diet for many species. Meadow voles, the most studied species in North America, eat heavily from grasses, sedges, and broad-leaved herbaceous plants known as dicotyledons. Stomach-content analysis of meadow voles has confirmed that all three categories show up regularly, though the proportions shift depending on what is available locally and seasonally.1Canadian Journal of Zoology. A comparison of faecal and stomach contents analysis in the meadow vole (Microtus pennsylvanicus) Sedges tend to be underestimated in studies that rely solely on fecal analysis, because their soft cell walls break down more completely during digestion, so the true proportion in the diet is higher than droppings alone suggest.
Prairie and field voles gravitate toward the same general menu: clover, dandelion, plantain, timothy grass, bluegrass, and whatever forbs are growing densely nearby. Voles are grazers, not browsers. They clip vegetation at or near ground level, often creating visible runways through dense grass where they repeatedly travel and feed. These runways are one of the easiest signs that voles are present in a yard or field.
Roots, Tubers, and Underground Food Stores
Several vole species are accomplished diggers, and for these animals, roots and underground plant parts are not a backup food but a staple. Water voles in Europe are a dramatic example. Research using DNA metabarcoding of water vole food caches found that dandelion roots made up about 95% of stored food, even though dandelion accounted for less than 10% of the available root biomass in the surrounding grassland.2bioRxiv. Is water vole diet consistent with the plant hypothesis for explaining population fluctuations? – Section: Results / Realised trophic niche / Food stores The remaining stores included small bulbs that were absent from random soil samples, suggesting voles actively seek out and select specific underground foods rather than eating whatever roots they happen to encounter.
Pine voles, which spend much of their life in shallow tunnel systems, cause the most visible root damage among North American species. They gnaw on the roots and bark of fruit trees, sometimes girdling a tree entirely below the soil line. This subterranean feeding habit makes pine voles a particular headache for orchard managers, because the damage is invisible until the tree starts to decline.
How the Diet Shifts With the Seasons
Voles do not hibernate, so they need to eat year-round, and what is available changes considerably between summer and winter. In warm months, fresh green shoots, leaves, flowers, and stems dominate. As autumn arrives and green growth dies back, voles shift toward seeds, roots, tubers, and bark. This transition is not always smooth. Studies of pine voles across multiple orchard habitats found that stomach contents declined markedly during winter in all four habitats examined, indicating that food intake drops when high-quality forage disappears.3Canadian Journal of Zoology. Seasonal variation in diet digestibility of pine voles
In winter, bark becomes especially important. Voles gnaw on the lower trunks and exposed roots of trees and shrubs, often under the cover of snow, where they are hidden from predators. Apple trees, ornamental shrubs, and young conifers are common targets. The damage tends to appear in spring once the snow melts, revealing girdled bark at the base of the plant. For gardeners and orchardists, this is the season when vole feeding causes the most lasting harm.
When Voles Eat Insects, Fungi, or Other Animals
Although the word “herbivore” fits most of the time, calling voles strict herbivores would be wrong for several species. Bank voles, one of the most common woodland voles in Europe, are genuinely omnivorous. Stable isotope feeding experiments have shown that bank voles readily incorporate insect matter into their diet; researchers fed captive bank voles a diet containing 30% insect-derived material and measured how it was metabolized.4BioOne Complete. Diet/Hair and Diet/Faeces Trophic Discrimination Factors for Stable Carbon and Nitrogen Isotopes, and Hair Regrowth in the Yellow-Necked Mouse and Bank Vole In the wild, bank voles eat beetles, caterpillars, snails, and other invertebrates, particularly when seeds and green vegetation are scarce.
Fungi are another underappreciated part of the vole diet. Small mammals, including voles, play a meaningful role in dispersing underground fungi like truffles. Because truffles fruit below the soil surface and cannot release spores into the wind, they depend on animals to dig them up, eat them, and spread spores through their droppings. A study examining fungal dispersal found substantial dispersal of truffles and mushrooms by small mammals, complementing the wind-driven dispersal of above-ground fungi.5PubMed. Wind and small mammals are complementary fungal dispersers For voles, eating truffles is a nutritional bonus packed with protein; for the fungi, it is their primary reproductive strategy.
Outsmarting Plant Defenses
Plants do not sit passively while voles eat them. Many produce bitter or toxic compounds, and voles have developed at least one remarkably clever workaround. Meadow voles have been observed cutting branches from young conifer trees and leaving them on the ground for several days before eating them. This looks like laziness or waste, but it turns out to be a deliberate strategy. Researchers found that after being cut for more than three days, the branches had significantly lower levels of phenolics and condensed tannins, the defensive chemicals that make fresh conifer needles unpalatable. The post-manipulation levels dropped to concentrations similar to the voles’ preferred summer foods.6PubMed. Branch-cutting behavior by the vole (Microtus pennsylvanicus) : A mechanism to decrease toxicity of secondary metabolites in conifers In other words, voles figured out food processing. They transform a low-quality, chemically defended resource into something their digestive systems can handle.
Beyond behavioral tricks, voles also rely on digestive adaptations. Brandt’s voles, a steppe-dwelling Asian species, cope with high-fiber diets through a combination of increased gut capacity, selective retention of plant particles in the hindgut, and coprophagy, the re-ingestion of special soft fecal pellets. This recycling step gives gut bacteria a second pass at breaking down tough cellulose, extracting more energy from fibrous plants than a single digestion cycle could.7PubMed Central. Selective digesta retention and coprophagy in Brandt’s vole (Microtus brandti) For an animal weighing around 45 grams, this is an impressive feat of nutritional engineering.
Foraging Under Fear
What voles eat is shaped not only by what grows nearby but also by where they feel safe eating it. Voles are prey for nearly everything: hawks, owls, foxes, snakes, weasels, cats. This constant threat changes their foraging behavior in measurable ways. Experimental studies have shown that voles deplete food to lower levels in patches with overhead vegetative cover compared to exposed patches. When avian predation risk was higher because of lower vegetation height, voles foraged more cautiously overall but ate more thoroughly in whatever sheltered spots remained.8PubMed. Foraging patterns of voles at heterogeneous avian and uniform mustelid predation risk
The picture gets more nuanced when you consider ground-based predators like weasels, which can follow voles into their tunnels and runways. Against aerial predators, thick grass is protection; against a weasel, it is irrelevant. Voles seem to adjust their strategies depending on which type of threat dominates. A field experiment with meadow voles found that when both supplemental food and straw shelter were available, voles recognized the lowest risk and foraged most intensely. Male pairs tended to occupy riskier areas without shelter, while female pairs selected sheltered habitats, suggesting that even sex and social context influence where voles choose to feed.9Ecosphere. Sex‐dependent habitat selection modulates risk management by meadow voles
For homeowners wondering why voles seem to love the area right next to a fence, a woodpile, or a thick mulch bed, predation risk is the answer. Voles feed most boldly where they feel concealed. Dense ground cover is not just habitat; it is the dining room they prefer.
Damage to Gardens, Orchards, and Farms
From the human perspective, the most notable thing about vole diets is the damage they cause. In gardens, voles chew on bulbs, root vegetables, hostas, and the crowns of perennial flowers. In orchards, they girdle young fruit trees under snow cover. In farm fields, high vole populations can reduce yields of alfalfa, clover, and other forage crops.
The problem is not limited to North America. European field voles of the genus Pitymys are responsible for irregular but sometimes severe damage to agricultural and horticultural crops. The damage is most intense in southern Europe, where voles in the species group savii cause serious losses to horticultural and floricultural crops on the Italian peninsula.10EPPO Bulletin. European Field Voles of the Genus Pitymys McMurtrie and their Damage in Agriculture, Horticulture and Forestry Outbreaks tend to follow boom-and-bust population cycles, so damage can go from negligible to devastating within a single year when conditions favor rapid breeding.
Practical defenses focus on removing the cover voles need to feel safe. Clearing mulch away from the base of trees, mowing grass short around garden beds, and using hardware-cloth tree guards are all more effective than poison in most residential settings. The key insight from the predation-risk research is that voles avoid feeding where they feel exposed. Making your plants less accessible from a vole’s hidden runway system is often enough to redirect feeding elsewhere.
How Vole Feeding Reshapes Plant Communities
Voles are small, but their collective impact on vegetation is enormous. This is one area where the research findings have genuinely surprised ecologists. A six-year experiment on grassland in the United States found that meadow voles reduced total plant standing crop by 30% to 72%, a range that overlaps with the grazing impact of large ungulates like cattle or bison.11Ecology. Massive and distinctive effects of meadow voles on grassland vegetation Four grass species and a legume that voles fed on declined sharply, while five forb species that voles avoided increased to fill the gaps. Within six years, the voles had effectively created plant communities dominated by the species they refused to eat.
A parallel experiment in Wisconsin prairie restorations told a similar story. When plots were opened to vole access after an initial two-year establishment period, one legume and one grass that voles favored went from a combined cover of about 43% to less than 1% within four years. Meanwhile, forbs that voles left alone expanded dramatically.12Ecological Applications. VOLE‐DRIVEN SUCCESSION IN EXPERIMENTAL WET‐PRAIRIE RESTORATIONS The diversity of the plant community eventually recovered numerically, but the species composition was entirely different. Voles had not simply trimmed the vegetation; they had redirected succession itself.
The ecological consequences extend to extreme environments too. In boreal and tundra ecosystems, post-fire regrowth of cottongrass (Eriophorum) was heavily grazed by tundra voles whose populations surged after fire removed predator cover. Vole-caused mortality of cottongrass was two orders of magnitude higher than natural mortality, approaching the death rate caused by the fire itself.13PubMed. Small herbivores with big impacts: Tundra voles (Microtus oeconomus) alter post-fire ecosystem dynamics By suppressing the recovery of grasses, voles may tip recovering landscapes toward shrub dominance, fundamentally altering the trajectory of the ecosystem.
Why Voles Eat What They Eat
Several factors converge to explain vole food choices. Body size is one: at 20 to 60 grams depending on the species, voles have high metabolic rates relative to their mass and need to eat frequently. They cannot afford to be too choosy, but they also cannot waste time on foods that are nutritionally poor or chemically defended. This balancing act produces the observed pattern of strong preferences (dandelion roots over other roots, certain grasses over others) alongside broad flexibility (switching to bark in winter, eating insects when available, letting conifer branches detoxify before consuming them).
Gut anatomy matters too. Voles have a large cecum, the fermentation chamber in the hindgut where symbiotic bacteria break down cellulose. This gives them more capacity to extract energy from fibrous plant material than a comparably sized rodent that eats mostly seeds. The coprophagy practiced by species like Brandt’s vole is essentially a way to double-dip on this fermentation, running difficult-to-digest material through the system twice. These adaptations let voles exploit a niche that would be energetically impossible for a small mammal without specialized digestive hardware.
Habitat and cover tie the whole picture together. A vole living in a dense grassland eats grass. A vole living along a streambank eats rushes and sedges. A water vole living in a European meadow hoards dandelion roots. A bank vole in a deciduous forest eats seeds, berries, fungi, and insects from the forest floor. The diet reflects the habitat, and the habitat is chosen largely for the safety it provides from predators. Remove the cover from any vole habitat, and the voles either leave or get eaten. The food they prefer and the safety they need are inseparable parts of the same ecological equation.